Watlow MICRODIN User Manual

Download

MICRODIN

User’s Manual

TOTAL

CUSTOMER

SA TISFACTION

3 Y ear W arranty

ISO 9001

Registered Company

Winona, Minnesota USA

Communicating Subpanel Temperature Controller

User Levels:

• New User ....................................................... go to page 1.1

• Experienced User .......................................... go to page 2.1

• Expert User ....................................................go to page 2.1

Installers:

• Set-up ............................................................ go to page 2.1

• Wiring & Installation ........................................go to page 3.1

Controls

1241 Bundy Blvd., P.O. Box 5580, Winona, MN USA 55987-5580, Phone: (507) 454-5300, Fax: (507) 452-4507

W0UD-XUMN Rev A Made in the U.S.A.

January 1997 $10

10123456789

24V‡ (ac/dc)

12345678910

External

Load

dc+

COM

dc-

Power Supply

60V max.

1A max.

Fuse

Addendum

MicroDIN User’s Manual & Quick Start Guide CE Compliance

Purpose

To meet Mark CE requirements, this addendum provides supplemental information to the MicroDIN User’s Manual (W0UD-XUMN Rev A), and the MicroDIN Quick Start Guide (W0UD-XQRN Rev A).

Power Supply Rating

MicroDIN CE Mark compliance requires an IEC 742 rated power supply. This applies to the following power supply references: User’s Manual: p. 3.2, 3.7 (fig. 3.7e), 3.10 (fig. 3.10), 3.11 (fig. 3.11) and A.14 Quick Start Guide: p. 13 (fig. 3.4e), 16, 17 and 22

Figure 3.7e— Power Wiring

NOTE: An IEC 742 rated power supply is required for CE compliance.

External DC Output Fusing

Also, a customer supplied 1A fuse is required for external dc output connection to meet CE compliance. This applies to the following external dc output references: User’s Manual: p. 3.7 (fig. 3.7b) Quick Start Guide: p. 13 (fig. 13b)

Figures 3.7b and 13b— Control Output, Open Collector with External Power Supply

External DC Output Derating

For MicroDIN CE Mark compliance, external load switching (maximum) for an open collector is derated from 60V @ 1A to 42V @ 1A. This applies to the following output rating

W0UD-XADN Rev A Watlow MicroDIN CE Addendum 1 April 1997

references: User’s Manual: p. 3.7 (fig. 3.7b) and A.14 Quick Start Guide: p. 13 (fig. 13b) and 22

(1044)

CE Addendum

Declaration of Conformity

WATLOW CONTROLS

1241 Bundy Boulevard

Series MicroDIN

Winona, Minnesota 55987 USA

Declares that the following product:

Designation: Series MicroDIN Model Number(s): UD 1 A -1CES - (Any four numbers or letters) Classification: Control, Installation Category II, Polution Degree II Rated Voltage: 24 to 28V‡ (ac/dc) Rated Frequency: 50/60 Hz Rated Power Consumption: 5VA maximum

Meets the essential requirements of the following European Union Directive(s) using the relevant section(s) of the normalized standards and related documents shown:

89/336/EEC Electromagnetic Compatibility Directive

EN 50082-2: 1995 EMC Generic immunity standard, Part 2: Industrial

EN 61000-4-2: 1995 Electrostatic discharge EN 61000-4-4: 1995 Electical fast transients ENV 50140: 1994 Radiated immunity ENV 50141: 1994 Conducted immunity ENV 50204: 1995 Cellular phone

EN 50081-2: 1994 EMC Generic emission standard, Part 2: Industrial

EN 55011: 1991 Limits and methods of measurement of radio disturbance

environment

characteristics of industrial, scientific and medical radiofrequency equipment (Class A)

73/23/EEC Low-Voltage Directive

EN 61010-1: 1993 Safety requirements for electrical equipment for

Déclare que le produit suivant :

Désignation : Série MicroDIN Numéro(s) de modèle(s) : UD 1 A - 1CES - (quatre chiffres ou lettres

Classification : Commande, installation catégorie II, degré de

Tension nominale : 24 à 28 V ‡ (c.a./c.c.) Fréquence nominale : 50/60 Hz Consommation d’alimentation nominale : 5 VA maximum

Conforme aux exigences de la (ou des) directive(s) suivante(s) de l’Union Européenne figurant aux sections correspondantes des normes et documents associés ci-dessous :

measurement, control, and laboratory use, Part 1: General requirements

quelconques)

pollution II

89/336/EEC Directive de compatibilité électromagnétique

EN 50082-2 : 1995 Norme générique d’insensibilité électromagnétique,

EN 61000-4-2 : 1995 Décharge électrostatique EN 61000-4-4 : 1995 Courants électriques transitoires rapides ENV 50140 : 1994 Insensibilité à l’énergie rayonnée ENV 50141 : 1994 Insensibilité à l’énergie par conduction ENV 50204 : 1995 Téléphone cellulaire

EN 50081-2 : 1994 Norme générique sur les émissions

EN 55011 : 1991 Limites et méthodes de mesure des caractéristiques

Partie 2 : Environnement industriel

électromagnétiques, Partie 2 : Environnement industriel

d’interférences du matériel radiofréquence industriel, scientifique et médical (Classe A)

73/23/EEC Directive liée aux basses tensions

EN 61010-1 : 1993 Exigences de sécurité pour le matériel électrique

de mesure, de commande et de laboratoire, Partie 1 : Exigences générales

English

Français

Erklärt, daß das folgende Produkt:

Beschreibung: Serie MicroDIN Modellnummer(n): UD 1 A - 1 CES - (4 beliebige Zahlen oder

Buchstaben)

Klassifikation: Regelsystem, Installationskategorie II,

Emissionsgrad II Nennspannung: 24 bis 28 V‡ (ac/dc) Nennfrequenz: 50/60 Hz Nominaler Stromverbrauch: Max. 5 VA

Erfüllt die wichtigsten Normen der folgenden Anweisung(en) der Europäischen Union unter Verwendung des wichtigsten Abschnitts bzw. der wichtigsten Abschnitte der normalisierten Spezifikationen und der untenstehenden einschlägigen Dokumente:

Deutsch

89/336/EEC EWG Elektromagnetische Verträglichkeit

EN 50082-2: 1995 EMC-Rahmennorm für Störsicherheit, Teil 2:

EN 61000-4-2: 1995 Elektrostatische Entladung EN 61000-4-4: 1995 Elektrische schnelle Stöße ENV 50140: 1994 Strahlungsimmunität ENV 50141: 1994 Leitungsimmunität ENV 50204: 1995 Mobiltelefon

EN 50081-2: 1994 EMC-Rahmennorm für Emissionen, Teil 2: Industrielle

EN 55011: 1991 Beschränkungen und Methoden der Messung von

Industrielle Umwelt

Umwelt

Funkstörungsmerkmalen industrieller, wissenschaftlicher und medizinischer Hochfrequenzgeräte (Klasse A)

72/23/EEC EWG Niederspannungsrichtlinie

EN 61010-1: 1993 Sicherheitsrichtlinien für Elektrogeräte zur Messung,

Declara que el producto siguiente:

Designación: Serie MicroDIN Números de modelo: UD 1 A - 1CES - (Cualquier combinación de cuatro

Clasificación: Control, categoría de instalación II, grado de

Tensión nominal: 24 a 28V ‡ (Vca/Vcc) Frecuencia nominal: 50/60 Hz Consumo nominal de energía: 5 VA máximo

Cumple con los requisitos esenciales de las siguientes directivas de la Unión Europea, usando las secciones pertinentes de las reglas normalizadas y los documentos relacionados que se muestran:

zur Steuerung und im Labor, Teil 1: Allgemeine Richtlinien

Español

números y letras)

contaminación ambiental II

89/336/EEC Directiva de compatibilidad electromagnética

EN 50082-2: 1995 Norma de inmunidad genérica del EMC, parte 2: Ambiente

EN 61000-4-2: 1995 Descarga electrostática EN 61000-4-4: 1995 Perturbaciones transitorias eléctricas rápidas ENV 50140: 1994 Inmunidad radiada ENV 50141: 1994 Inmunidad conducida ENV 50204: 1995 Teléfono portátil

EN 50081-2: 1994 Norma de emisión genérica del EMC, parte 2: Ambiente

EN 55011: 1991 Límites y métodos de medición de características de

industrial

perturbaciones de radio correspondientes a equipos de radiofrecuencia industriales, científicos y médicos (Clase A)

73/23/EEC Directiva de baja tensión

EN 61010-1: 1993 Requerimientos de seguridad para equipos eléctricos

Erwin D. Lowell Winona, Minnesota, USA Name of Authorized Representative Place of Issue

General Manager February 1, 1997 Title of Authorized Representative Date of Issue

________________________________________ Signature of Authorized Representative

de medición, control y uso en laboratorios, Parte 1: Requerimientos generales

W0UD-XCEM-0000 Rev A01

(1043)

Meet the MicroDIN Team

We stand behind our product and are committed to your total satisfaction. Pictured below are some of the people at Watlow who have worked hard to bring you one of the finest industrial temperature controllers available today. Included in the photo are members of the development team, production team, and representatives from our core manufacturing and customer service areas.

TOTAL

CUSTOMER

SA TISFACTION

3 Y ear W arranty

ii Watlow MicroDIN

Front Row: Rob Hermann, board assembly; Gene Lauer, product manager; Keith Ness, engineering team leader; Steve Lubahn, group leader; Doug Wolfe, technician; Mark Hoven, engineer. 2nd Row, Sitting behind Front Row: Sally Kotschevar, purchasing; Lisa Voelker, technician; Carolyn Konkel, wave inspection; Mollee Smith, PACE line; John Pham, product development engineer; Randy Haack, application engineer. Standing: Barb Lowenhagen; Dave Zill, board assembly; Erin Benson, technician; Kathy Holzworth, production test; John Gabbert, technical documentation; Tonya Adank, surface mount; Stan Breitlow, engineering; Shirley Brown, final assembly; Jason Beyer, application engineer; Rose Johnson, final assembly; Jamil Al-Titi, R & D; Brian Dulek, wave; Jim Brickner, Winona management; Steve Griffiths, manufacturing engineer; Mary White, customer service planner; Dan Johnson, agency coordinator; Les Stellpflug, R & D.

About Watlow Controls

Watlow Controls is a division of Watlow Electric Mfg. Co., St. Louis, Missouri, a manufacturer of industrial electric heating products, since 1922. Watlow begins with a full set of specifications and completes an industrial product that is manufactured totally in-house, in the U.S.A. Watlow products include electric heaters, sensors, controls and switching devices. The Winona operation has been designing solid state electronic control devices since 1962, and has earned the reputation as an excellent supplier to original equipment manufacturers. These OEMs depend upon Watlow Controls to provide compatibly engineered controls which they can incorporate into their products with confidence. Watlow Controls resides in a 100,000 square foot marketing, engineering and manufacturing facility in Winona, Minnesota.

NOTE: Details of a “Note” appear here in the narrow margin on the outside of each page.

CAUTION: Details of a “Caution” appear here in the narrow margin on the outside of each page.

Safety Information

We use note, caution and warning symbols throughout this book to draw your attention to important operational and safety information.

A bold text “NOTE” marks a short message in the margin to alert you to an important detail.

A bold text “CAUTION” safety alert appears with information that is important for protecting your equipment and performance. Be especially careful to read and follow all cautions that apply to your application.

A bold text “WARNING” safety alert appears with information that is important for protecting you, others and equipment from damage. Pay very close attention to all warnings that apply to your application.

WARNING: Details of a “Warning” appear here in the narrow margin on the outside of each page.

The safety alert symbol, ç, (an exclamation point in a triangle) precedes a general CAUTION or WARNING statement.

The electrical hazard symbol, Ó, (a lightning bolt in a triangle) precedes an electric shock hazard CAUTION or WARNING safety statement.

Technical Assistance

If you encounter a problem with your Watlow controller, see the Troubleshooting Table on page 6.5 first, review all of your configuration information to verify that your selections are consistent with your application: inputs; outputs; alarms; limits; etc. If the problem persists after checking the above, you can get technical assistance from your local Watlow representative, or by dialing (507) 454-5300.

An applications engineer will discuss your application with you.

Please have the following information available when calling:

• Complete model number • All configuration information

• User’s Manual • Diagnostic menu readings

Your Feedback

Your comments or suggestions on this manual are welcome, please send them to: Technical Writer, Watlow Controls, 1241 Bundy Blvd., P.O. Box 5580, Winona, MN 55987-5580, Phone: (507) 454-5300, Fax: (507) 452-4507. The MicroDIN User’s Manual is copyrighted by Watlow Winona, Inc., © December 1996, with all rights reserved.

Watlow MicroDIN iii

Table of Contents

Chapter 1: Overview .........................................................................1.1

Introduction to the MicroDIN Controller .................................. 1.2

Setup Steps ............................................................................. 1.3

Indicator Lights ........................................................................ 1.3

Chapter 2: Communications Setup ................................................... 2.1

Communications Overview ..................................................... 2.2

EIA-485 Network ..................................................................... 2.3

Elements of a MicroDIN 485 Network ...................................... 2.3

PC Connection via 232/485 Converter ..................................... 2.3

Special Case 485 Considerations .............................................2.4

Termination Resistor ............................................................... 2.4

Pull-Up and Pull-Down Resistors ............................................ 2.4

Modbus™Protocol ................................................................... 2.5

RTU ......................................................................................... 2.5

Access via Registers ................................................................2.5

MicroDIN Supports .................................................................. 2.5

Modbus™ Register Table ...........................................................2.6

DIP Switches Set Address/Baud Rate ..................................... 2.7

MicroDIN DIP Switch Table ..................................................... 2.7

Required Parameters Setup .....................................................2.8

Serial Data Format ................................................................. 2.9

Data Format Table .................................................................... 2.9

Wiring Tasks ...........................................................................2.9

Wiring Task List ....................................................................... 2.9

Communications Software ...................................................... 2.9

Watlow’s WatLink ....................................................................2.9

Other Software Options ........................................................... 2.9

Chapter 3: Installation Wiring .......................................................... 3.1

Introduction ............................................................................. 3.2

Set DIP Lower First................................................................... 3.2

Mount on DIN Rail or Tabs ...................................................... 3.2

Wire Unit I/O............................................................................. 3.2

Installation Accessories ........................................................... 3.2

Mount the MicroDIN ................................................................3.3

Mount the MicroDIN on a DIN Rail .......................................... 3.4

MicroDIN RJ-11 and 10-Pin Connectors ................................. 3.5

Input Wiring ............................................................................. 3.6

Output and Power Wiring ........................................................ 3.7

Communications Wiring .......................................................... 3.8

Convertor-To-MicroDIN Wiring Example ................................. 3.8

Special EIA-485 Considerations ............................................... 3.9

Wiring Examples .................................................................... 3.10

Wiring Examples .................................................................... 3.11

Chapter 4: Features .......................................................................... 4.1

The System ............................................................................. 4.2

Auto-tune ................................................................................. 4.2

Power Limit ............................................................................. 4.3

Input ........................................................................................4.4

Calibration Offset .....................................................................4.4

Filter Time Constant ................................................................. 4.5

Sensor Selection ...................................................................... 4.6

Range Low or Range High .......................................................4.6

Control Methods ...................................................................... 4.7

On/Off ...................................................................................... 4.7

Proportional Control ................................................................ 4.8

Proportional plus Integral (PI) Control ..................................... 4.9

Proportional plus Integral plus Derivative (PID) Control ........4.10

Alarms ................................................................................... 4.11

Alarm Set Points .................................................................... 4.11

Alarm Hysteresis .................................................................... 4.11

Process or Deviation Alarms .................................................. 4.12

Alarm Latching ...................................................................... 4.12

Alarm Silencing ...................................................................... 4.13

Errors ..................................................................................... 4.14

Indicator Lights ...................................................................... 4.14

Open Loop Detect ..................................................................4.14

Bumpless Transfer ................................................................. 4.15

Chapter 5: Parameters ..................................................................... 5.1

System Group .......................................................................... 5.2

Input Group ............................................................................. 5.4

Control Output Group .............................................................. 5.8

Operation Group .................................................................... 5.11

PID Group .............................................................................. 5.13

Alarm Output Group ............................................................... 5.17

Error Group ............................................................................ 5.22

Characteristics Group ............................................................ 5.25

Diagnostics Group ................................................................. 5.27

Calibration Group ................................................................... 5.30

Chapter 6: Operations ...................................................................... 6.1

Startup MicroDIN ..................................................................... 6.2

MicroDIN Shutdown ................................................................ 6.3

Troubleshooting: Alarms and Errors................................. 6.4 - 6.5

Calibrating MicroDIN ............................................................... 6.6

Appendix .......................................................................................... A.1

Modbus™RTU .......................................................................... A.2

Glossary .................................................................................. A.8

Declaration of Conformity ...................................................... A.12

Specifications ........................................................................ A.14

Ordering Information..............................................................A.15

Index ..................................................................................... A.16

Parameter Index .................................................................... A.18

Required Parameters Setup Order .........................................A.19

Warranty Information .................................................. Back Cover

Figures by page

MicroDIN Inputs and Outputs .................................... Figure 1.2

MicroDIN Indicator Lights .................................................... 1.3

MicroDIN Top View with DIP Switches ................................. 2.1

Figure Description ................................................................ 2.1

Mounting a MicroDIN Controller ........................................... 3.2

Mounting on a DIN rail ........................................................ 3.3a

Dismounting off a DIN rail .................................................. 3.3b

Bottom view of case with pin assignments

Control Input, Thermocouple ..............................................3.5a

Control Input, 2 and 3-wire RTD ......................................... 3.5b

Control Input ....................................................................... 3.6a

Internal Output Circuitry ..................................................... 3.6b

Alarm Output ...................................................................... 3.6c

Power Wiring ...................................................................... 3.6d

Converter-to-MicroDIN Wiring Example ............................... 3.7

Termination for MicroDIN ..................................................... 3.9

System Wiring Example ...................................................... 3.10

System Wiring Example ...................................................... 3.11

Auto-tuning ........................................................................... 4.2

Power Limits ........................................................................ 4.3

Calibration Offset ..................................................................4.4

Filtered and Unfiltered Input Signals ..................................... 4.5

Sensor Ranges ..................................................................... 4.6

On/Off Control for Cooling and Heating ................................ 4.7

Proportional Control ............................................................. 4.8

Proportional plus Integral Control ........................................ 4.9

PID Control ......................................................................... 4.10

Alarm Settings ....................................................................4.11

Alarm Latching ................................................................... 4.12

Alarm Silencing .................................................................. 4.13

Error Information ................................................................ 4.14

Calibrating diagrams ............................................................. 6.6

........................... 3.4

iv Watlow MicroDIN

Chapter One:

Overview

Introduction to the MicroDIN Controller .. 1.2

Setup Steps ............................................. 1.3

Indicator Lights ....................................... 1.3

Overview

Watlow MicroDIN 1.1

Overview

Introduction to the MicroDIN Controller

The Watlow MicroDIN controller is a DIN rail-mounted, temperature controller. It uses one input and two outputs, network connections and dozens of parameters to satisfy a broad variety of control needs.

The single input can use either a thermocouple or RTD sensor. The single control output provides an open collector or switched dc output signal for a power switching device with a DC input. The single alarm output is an electromechanical relay. The network connections allow as many as 32 controllers to be configured and monitored from a single personal computer.

You can configure, operate and monitor the MicroDIN almost entirely from a PLC or personal computer via a serial connection using RJ-11 jacks. Indicator lights on the face of the controller monitor error states, power, communications activity and output activity.

Communications Input and Output to and from Personal Computer

Figure 1.2 - MicroDIN inputs and outputs in a thermal system

1-32 devices/ EIA-485 Network

Per Unit:

• Sensor Input from the process

• Control Output to the process

• Alarm Output about the process

MicroDIN

Temperature Controller

Power

Comms

Control Output

Alarm

Input Error

Address

1 2 3 4

MicroDIN

Temperature Controller

Power

Comms

Control Output

Alarm

Input Error

Address

MicroDIN

Temperature Controller

Power

Comms

Control Output

Alarm

Input Error

Address

MicroDIN

Temperature Controller

Power

Comms

Control Output

Alarm

Input Error

Address

1.2 Watlow MicroDIN1.2 Watlow MicroDIN

Setup Steps

Address

Power

Comms

Alarm

Temperature Controller

MicroDIN

Temperature Controller

MicroDIN

Control Output

Input Error

Indicator Lights

Figure 1.3 - MicroDIN indicator lights

1. Set up communications.

2. Set the controller’s address and baud speed with the DIP switches on the top panel (see Chapter 2, Communications Setup). The controller uses eight data bits with no parity.

3. Mount the controller (see Chapter 3, Wiring).

4. Wire the controller (see Chapter 3, Wiring).

5. Communicate with MicroDIN via an EIA-485 network with Modbus RTU

protocol.

Power

Green light stays lit when the power is on and the controller is ok.

• If it isn’t on or pulsates,

check your power source.

Control Output

Green light is lit or flashes when the control output is energized.

• If it does not light up, the

output is not turning on.

Alarm

Red Light is lit during an input alarm condition. If it is lit:

• Correct alarm condition

Communications

Green Light controller sends or receives valid data over its network port.

• If it does not light up, check the controller address and the communications setup.

Input Error

Red Light is lit if there is a sensor problem. If it is lit:

• Verify the sensor wiring, polarity and function.

• Rewire or replace as necessary.

Address Field

Record the unit’s address in erasable marker here.

™

pulsates when the

or change alarm configuration.

• Reset the alarm if it is

latched.

Overview

Watlow MicroDIN 1.3

Overview

Notes

1.4 Watlow MicroDIN

Chapter Two:

Communications Setup

Setup

Communications Overview

EIA-485 Network ............................... 2.2

Modbus™Protocol ............................. 2.2

Set Address/Baud Rate .......................2.2

Serial Data Format ............................. 2.2

Wiring Tasks ...................................... 2.2

Communications Software ................. 2.2

EIA-485 Network

Elements of a MicroDIN 485 Network 2.3 PC Connection via 232/485 Converter 2.3

Special Case 485 Considerations ....... 2.4

Termination Resistor .......................... 2.4

Pull-Up and Pull-Down Resistors ...... 2.4

Modbus Protocol

RTU ................................................... 2.5

Access via Registers .......................... 2.5

MicroDIN Supports... ......................... 2.5

Modbus™Register Table .................... 2.6

DIP Switches Set Address/Baud Rate

MicroDIN DIP Switch Table ............... 2.7

Required Parameters Setup ............... 2.8

Serial Data Format

Data Format Table .............................. 2.9

Wiring Tasks

Wiring Task List ................................. 2.9

Communications Software

Watlow’s WatLink .............................. 2.9

Other Software Options ..................... 2.9

Communications

Watlow MicroDIN 2.1

Communications Overview

Communication

Setup

EIA-485 Network

The MicroDIN uses the EIA-485 (formerly, ÒRS-485Ó) hardware interface to communicate with three wires in a half-duplex configuration, up to 32 remote devices with a master unit on a network up to 4,000 feet long using 14-26 gauge wire.

Modbus Protocol

The MicroDIN uses ModbusªRTU protocol to read and write to registers that can be viewed or changed from a personal computer. Each MicroDIN ÔparameterÕ has a corresponding Modbusªregister and access privileges. The MicroDIN parameter register numbers and the order of priority appear later in this chapter. Chapter 5 details all the MicroDIN parameters, and the Appendix provides information on how to write custom Modbusªapplications

Set Address/Baud Rate

You must configure the communications speed and network address of the MicroDIN controller with the eight-bit DIP switch on the top of the unit. Set the controller address with the first six switches and the network speed (9,600 or 19,200 baud) with the eighth switch. Turn to the DIP switch page later in this chapter.

Serial Data Format

The MicroDIN uses the an 8-N-1 data format; 8 data bits, no parity, 1 stop bit, and 1 start bit. See the data format table later in this chapter.

Wiring Tasks

In addition to wiring the controllerÕs input, outputs and power connections, you must also wire the EIA-232-to-EIA-485 converter; connect your computer to the MicroDIN, and connect the MicroDIN communications daisy chain. See ÒCommunications WiringÓ in Chapter 3 for full detail.

Communications Software

Watlow offers a Windows application for MicroDIN, called, ÒWatLink,Ó which will both set up and run multiple MicroDINs over an EIA-485 network using the Modbusªprotocol. Turn to a screen sample at the end of this chapter.

You may also write your own application (see Appendix for more detail), or purchase any of several available Modbusª-capable control software packages.

2.2 Watlow MicroDIN

EIA-485 Network

The MicroDIN EIA-485 (RS-485) Network Characteristics

An EIA-485 interface uses three wires in a half-duplex configuration.

The EIA-485 standard specifies a T+/R+ line; a T-/R- line; and a common line. EIA-485 interprets a -5 volt signal <None> as a 1, a +5-volt signal as a 0. Up to 32 remote devices can be connected to a master on a multi-drop network up to 4,000 feet long.

For industrial networks, EIA-485 offers low impedance, a multiple-device capability, strong noise immunity and the long distance capability.

PC Connection via 232/485 Converter

Watlow recommends connecting the MicroDIN to your personal computers with an EIA-232 (RS-232) to EIA-485 (RS-485) converter.

The 232-to-485 converters are proven reliable, low cost, and readily available. We recommend these suppliers:

• B & B Electronics Manufacturing Company

707 Dayton Road, PO Box 1040, Ottawa, IL 61350 Tel: (815) 433-5100; Fax: (815) 434-7094; Web: http://www.bb-elec.com Request part number: 485OIC with a power supply and the correct 25-pin

gender connector for your computer.

• CMC (Connecticut microComputer, Inc.)

P.O. Box 186, Brookfield, CT 06804 Tel: (800) 426-2872, (203) 740-9890; Fax: (203) 775-4595 Request part number: ADA485L with the correct 25-pin gender connector

for your computer.

Setup

Communications

See Chapter 3

for wiring details.

Watlow MicroDIN 2.3

Special Case 485 Network Considerations

If your EIA-485 network does not work, it may require termination resistors.

Communication

Setup

çCAUTION:

Apply termination and pull-up/pull-down resistors only if necessary to establish data communications. Adding this resistance to a network where it is not required could result in loss of communications and damage to process product.

Termination Resistor at the Last MicroDIN

In some cases long distance networks may require termination resistors. If the continuity checks good and you still cannot get valid responses, add termination.

You can make a terminator by placing a 120½ resistor across the C and D terminals of a standard RJ-11 phone plug. Plug the terminator into the open socket in the furthest MicroDIN from the computer.

See Chapter 3, ÒInstallation and Wiring,Ó for a wiring diagram.

Termination and Pull-Up/Pull-Down Resistors at the Converter

If you use a terminator, you should also add pull-up and pull-down resistors to the EIA-485 converter box.

Place a 120-ohm resistor across the transmit/receive terminals (C and D) of the converter box.

Add 1K½ pull-up and pull-down resistors as shown in Chapter 3 to maintain the correct voltage during the idle state.

See Chapter 3 for wiring diagram.

2.4 Watlow MicroDIN

MicroDIN, A Modbus™Remote Terminal Unit (RTU)

RTU

The MicroDIN uses Modbus™RTU (remote terminal unit) protocol to read and write to registers that can be viewed or changed from a personal computer. Sending ASCII text commands to the MicroDIN will not work.

Access Via Registers

MicroDIN Supports...

çCAUTION:

Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

See Disable Nonvolatile Memory (System Group), Ch. 5.

Each MicroDIN parameter has a corresponding Modbus™register and access privileges. The value of each parameter is stored in a Modbus™register. The access privilege — read only, write only or read/write — determines whether you can change and/or view a parameter’s value. Chapter 5 explains some of the interactions between parameters. The tables at the end of this chapter show the parameters and their setup order.

Multiple Register Reads

MicroDIN supports Modbus™Commands 03 and 04 read of a 1- to 32-register block. Responses from -1999 to 9999 are valid data for up to 32 register writes.

Modbus™32000 Errors

A Modbus™read command response of -32000 indicates that a register is not implemented; -32001, register not active; or -32002, not read accessible.

Single Register Writes

MicroDIN supports a Modbus™write command (06) to a single register.

Multiple Register Writes

MicroDIN supports a Modbus™write command (16) for multiple writes as long as the data length is 1.

Writing to address 0 broadcasts to all devices on the network.

Write Exceptions

MicroDIN supports write exceptions: 01, illegal function; 02, illegal register; 03, illegal data.

Loop Back

MicroDIN supports a Modbus™write command 08, “loop back” to echo a message.

Setup

Communications

Compatible Software

You will need compatible software to interact with a MicroDIN controller. One such program is included with the MicroDIN Startup Kit. If you are accustomed to using a Modbus™, see the Appendix for information to help write your own Modbus™software application.

Watlow MicroDIN 2.5

Modbus Register Numbers

Address

Absolute Relative Parameters

40001 0 Model Number (Diagnostics)

Communication

40002 1 Serial Number (Characteristics)

Setup

40003 2 Serial Number 2 (Characteristics) 40004 3 Software ID number (Characteristics) 40005 4 Software Revision (Characteristics) 40006 5 Date of Manufacture (Characteristics) 40007 6 Ship Date (Characteristics ) 40017 16 Control Output Hardware (Control Output) 40018 17 Alarm Output Hardware (Alarm) 40025 24 Disable Non-volatile Memory (System) 40101 100 Input Actual (Input) 40102 101 Input Error (Input) 40104 103 Output Power (Control Output) 40107 106 Alarm Condition (Alarm Output) 40201 200 Operation Mode (Operation) 40205 204 PID Output Power (PID) 40206 205 Proportional Term (PID) 40207 206 Integral Term (PID) 40208 207 Derivative Term (PID) 40210 209 System Error (Error) 40211 210 Open Loop Error (Error) 40301 300 Set Point (Operation) 40302 301 User Operation Mode (Operation) 40305 304 Auto-tune Set Point (PID) 40306 305 Initiate Auto-tune (PID) 40311 310 Manual Output Power (Operation) 40312 311 Clear Error (Error) 40322 321 Alarm Low (Alarm Output) 40323 322 Alarm High (Alarm Output) 40332 331 Clear Alarm (Alarm Output) 40333 332 Silence Alarm (Alarm Output) 40501 500 Proportional Band (PID) 40502 501 Integral (PID) 40503 502 Reset (PID) 40504 503 Derivative (PID) 40505 504 Rate (PID) 40507 506 Cycle Time (PID) 40508 507 Control Output Hysteresis (PID) 40601 600 Sensor Type (Input)

Address

Absolute Relative Parameters

40602 601 Input Type (Input) 40603 602 Range Low (Input) 40604 603 Range High (Input) 40605 604 Filter Time Constant (Input) 40606 605 Calibration Offset (Input) 40607 606 Decimal Point (System) 40608 607 Error Clearing Mode (Error) 40701 700 Control Output Function (Control Output) 40714 713 Power Limit Set Point (Control Output) 40715 714 High Side Power (Control Output) 40716 715 Low Side Power (Control Output) 40718 717 Alarm Output Function (Alarm Output) 40720 719 Alarm Type (Alarm Output) 40721 720 Alarm Hysteresis (Alarm Output) 40722 721 Alarm Latching Mode (Alarm Output) 40723 722 Alarm Silencing Mode (Alarm Output) 40724 723 Alarm Active Sides (Alarm Output) 40725 724 Alarm Logic (Alarm Output) 40901 900 Units Type (System) 40902 901 C or F (System) 40903 902 Input Error Action (Input) 40904 903 Fixed Manual Output (Control Output) 40905 904 Activate Open Loop Detect (Error) 41501 1500 Ambient (CJC) Temperature (System) 41502 1501 Ambient (CJC) A-to-D Counts (Diagnostics) 41503 1502 RTD Lead Compens. A-to-D Counts (Diag) 41504 1503 RTD Lead Resistance (Diagnostics) 41505 1504 Input A-to-D Counts (Diagnostics) 41513 1512 Enter Diagnostics Mode (Diagnostics) 41514 1513 Test Displays (Diagnostics) 41515 1514 Test Outputs (Diagnostics) 41601 1600 Enter Calibration Mode (Calibration) 41602 1601 Restore to Factory Calibration (Calibration) 41603 1602 Reset Factory Defaults (Calibration) 41604 1603 Calibration Commands (Calibration)

2.6 Watlow MicroDIN

Set Address/Baud Rate

Configure the communications speed and network address of the MicroDIN controller with the eight-bit DIP switch on the top panel. Set the controller address with the first six switches. Set an address between 1 and 63. The network will not work correctly if any two controllers have the same address. DIP switch 1 sets the left-most binary digit. Switch 6 sets the right-most digit.

Record the MicroDIN’s address in erasable marker on the white space on the front of the unit.

The seventh switch has no effect. Set the network speed (9,600 or 19,200 baud) with the eighth switch.

Setup

Communications

Figure 2.7 MicroDIN top view with DIP switches and baud settings

Table 2.7 Decimal-to-binary conversion

1 2 3 4 5 6 7 8

O N

↑

Dec. Binary

1 000001 2 000010 3 000011 4 000100 5 000101 6 000110 7 000111 8 001000

9 001001 10 001010 11 001011 12 001100 13 001101 14 001110 15 001111

1 2 3 4 5 6 7 8

O N

↑

Top View

Dec. Binary

16 010000 17 010001 18 010010 19 010011 20 010100 21 010101 22 010110 23 010111 24 011000 25 011001 26 011010 27 011011 28 011100 29 011101 30 011110 31 011111

1 2 3 4 5 6 7 8

O N

↑

1 2 3 4 5 6 7 8

O N

↑

1 2 3 4 5 6 7 8

O N

↑

1 2 3 4 5 6 7 8

O N

↑

Dec. Binary

32 100000 33 100001 34 100010 35 100011 36 100100 37 100101 38 100110 39 100111 40 101000 41 101001 42 101010 43 101011 44 101100 45 101101 46 101110 47 101111

9600 baud (bit 8 on)

19.2k baud (bit 8 off)

1 2 3 4 5 6 7 8

O N

↑

Dec. Binary

48 110000 49 110001 50 110010 51 110011 52 110100 53 110101 54 110110 55 110111 56 111000 57 111001 58 111010 59 111011 60 111100 61 111101 62 111110 63 111111

Watlow MicroDIN 2.7

Required Parameters Setup Order

This table provides 1) the correct order of entry, 2) the effect of a parameter change, and 3) a place to document settings.

Changing this Affects this

Communication

Setup

➝

Units Type C or F Input Error Action Control Output Function Set Fixed Manual Output O Open Loop Detect Sensor Type Input Type O Range Low C D D C Range High C D D C Decimal Point D D Calibration Offset C D D C Filter Time Constant D D Error Clearing Mode Power Limit Set Point C D D C High Side Power O Low Side Power O Alarm Output Function Alarm Type D D Alarm Hysteresis C D D C Alarm Latching Mode Alarm Silencing Mode Alarm Active Sides Alarm Logic Alarm High C D D O C Alarm Low C D D O C Propband C D D C Integral O Reset O Derivative Rate Cycle Time Output Hysteresis C D D C Operation Mode Set Point Manual Output Power O O O O Set Point C D D O O C

Table 2.8 - Parameters Setup order.

Watlow MicroDIN 2.8

➝

CAUTION: Parameters should be set up in this order.

➝

C or F

Units Type

Control Output Function

Input Type

Sensor Type

Low Side Power

High Side Power

Range High

Range Low

Decimal

Operation Mode

Alarm Type

Note: This table also appears

inside the back cover, p. A.19

Key:

D = Changing will change the default

C = Changing will convert the

temperature scale

O = Other effect (see Ch. 5

(See Parameter Index, p. A.18

)

, for detail)

Document your settings below

Serial Data Format

Configure your computer’s COM1 or COM2 (communications) port data format to match the MicroDIN’s settings in the table below.

Table 2.9a Serial Data Format

MicroDIN Installation Wiring Tasks

Communications Software WatLink

Figure 2.9b WatLink for MicroDIN sample software screen

Data Bits Parity Stop Bit Start Bit

8 None 1 1

MicroDIN requires these wiring tasks for a successful installation

1. Wire MicroDIN sensor input.

2. Wire MicroDIN Output 1, the control output.

3. Wire MicroDIN Output 2, the alarm output.

4. Wire MicroDIN power.

5. Connect the MicroDIN communications daisy chain.

6. Wire the 232-to-485 converter; connect to the computer.

7. If necessary, wire the termination and pull-up/pull-down resistors.

Watlow offers a Modbus package in WatLink, software that will set up and run multiple MicroDINs over an EIA485 network. WatLink, a Windows 3.31 or Windows 95 application, is available from any Watlow sales representative or authorized distributor. WatLink can handle up to 32 different MicroDIN units.

™

Setup

Communications

Other Software

To communicate with MicroDIN, you must use a Modbus™RTU (remote terminal unit) compatible software package. Sending ASCII commands via a standard serial communication application will not work. Refer to the Appendix if you’re writing your own Modbus™RTU application.

Watlow MicroDIN 2.9

Notes

Communication

Setup

2.10 Watlow MicroDIN

Installation and Wiring ■

Chapter Three:

Installation and Wiring

Introduction

Set DIPs First ......................................3.2

Mount on DIN Rail Tabs...................... 3.2

Wire Unit I/O .......................................3.2

Installation Accessories ..................... 3.2

Mounting the MicroDIN .......................... 3.3

Mounting the MicroDIN on a DIN Rail ... 3.4 MicroDIN RJ-11 and 10-pin Connectors 3.5

Input Wiring ............................................ 3.6

Output and Power Wiring ....................... 3.7

Communications Wiring ......................... 3.8

Converter-To-MicroDIN Wiring Example 3.8

Special EIA-485 Considerations ............. 3.9

Wiring Example .................................... 3.10

Wiring Example .................................... 3.11

Install and Wire

Watlow MicroDIN 3.1

Introduction

Set DIP Switch First

For a successful MicroDIN installation you need to cover the tasks cited in the subheads below. If you do all these things and the MicroDIN doesn’t work, go to the troubleshooting chart in Chapter 6.

If you haven’t done it already, set the controller’s address and baud speed with the DIP switches on the top of the unit (see Chapter 2, Communications Setup). The controller uses eight data bits with no parity, and 1 stop bit.

Install and Wire

Mount on DIN Rail or Tabs

Mount the controller(s) either on an EN 50022 35mm x 7.5mm DIN rail or with the built-in mounting tabs.

Wire Unit I/O

Wire the MicroDIN’s input, output, communications and power connections using the diagrams in this chapter.

Installation Accessories

0219-0218-0000 Included, 6-inch communications cable (RJ-11, 4-conductor,

straight through) 0836-0445-0000 Included, 10-pin removable connector with screw terminals Not Included: 0219-0217-0000 7-foot communications cable (RJ-11, 4-conductor, straight

through) 0830-0473-0000 Communications converter (EIA-232 to EIA-485) 0830-0474-0000 Power supply (120VÅ (ac) input, 24VÎ (dc) output)

3.2 Watlow MicroDIN

Mounting the MicroDIN

To mount a MicroDIN on a DIN rail, hook the upper lip of the rail mounting bracket onto the rail and press the controller down until the bottom lip of the mount snaps onto the rail. To remove, as you push the back of the controller down lift the front up until the bottom lip unsnaps from the rail.

To mount a MicroDIN on a panel, use the dimensions below to drill screw holes for the mounting bracket.

Figure 3.3 Mounting a MicroDIN controller.

Side View

3.750 in

(146 mm)

DIN

rail

bracket for 

panel mounting

(#6 screw

or m3.5 required)

4.225 in

(107 mm)

4.650 in

(118 mm)

.318 in (8 mm)

MicroDIN

Temperature Controller

Power

Comms

Control Output

Alarm

Input Error

Address

Top/bottom mount hole offset

Front View

Install and Wire

Min. Clearance

between rail

centerlines

5.750 in

(146 mm)

2.875 in (73 mm)

CAUTION: Maintain the correct spacing between rows of controllers to allow sufficient air circulation and installation clearance. Failure to do so could result in damage to equipment.

5.062 in

(129 mm)

Attachment Angle

DIN rail

10°

Min. Clearance 2 in

(51 mm)

1.637 in

(42 mm)

MicroDIN

Temperature Controller

Power

Comms

Control Output

Alarm

Input Error

Address

MicroDIN

Temperature Controller

Power

Comms

Control Output

Alarm

Input Error

Address

1.650 in

(42 mm)

Use DIN EN 50022 35mm x 7.5mm Rail

Watlow MicroDIN 3.3

Mounting the MicroDIN on a DIN rail

To Mount MicroDIN

1. Push unit in and down to catch rail hook on top of rail.

2. Rotate bottom of unit in toward rail.

3. Rail clasp will audibly “snap” into place. If the MicroDIN does not snap into place, check to see if the rail is bent.

Install and Wire

①

Figure 3.4a -

Mounting a MicroDIN

controller on a DIN rail.

To Dismount MicroDIN

1. Press down on back of controller until the bottom hook clears the rail.

2. Then rotate bottom up and away from rail.

Figure 3.4 b-

Dismounting a MicroDIN

controller from a DIN rail.

➂ "Snap"

➁

①

3.4 Watlow MicroDIN

MicroDIN RJ-11 and 10-pin Connectors

1 2345678910

12345678910

ABCD

The MicroDIN 10-pin screw terminal connector, on the bottom of the case, links

WARNING: To avoid potential electric shock, use National Electric Code (NEC) safety practices when wiring and connecting this unit to a power source and to electrical sensors or peripheral devices. Failure to do so could result in injury or death.

it to its power supply, control input, control output and alarm output. Use 26- to 14-gauge wire to connect to the plug terminals.

The alarm output is an electromechanical relay. See the Appendix for information on sensor ranges and specifications. See

Chapter 5

: Parameters for information about software configuration.

communications

sockets 1 and 2

(RJ-11)

Bottom View

Install and Wire

Figure 3.5 - Bottom view of MicroDIN case with connector assignments.

WARNING: Install high or low temperature limit control protection in systems where an over temperature fault condition could present a fire hazard or other hazard. Failure to install temperature limit control protection where a potential hazard exists could result in damage to equipment and property and injury to personnel.

Front of Unit

10-pin removable connector

Input

1. S1 or thermocouple+

2. S3 or thermocouple-

3. S2

Control Output

4. dc+

5. dc-

6. common (COM)

Alarm Output (electromechanical relay)

7. alarm normally open (NO)

8. alarm common (COM)

Power

9. L2, 24V‡ (ac/dc)-

10. L1, 24V‡ (ac/dc)+

Watlow MicroDIN 3.5

Input Wiring

Figure 3.6a — MicroDIN Isolation Diagram

Power Supply

Safety Isolation UL/CE

Install and Wire

Logic

and

Input

Alarm

Outputs



Control Output

Comms



500V Noise Isolation

Figure 3.6b — Control Input, Thermocouple

12345678910

Figure 3.6c — Control Input, 2-wire RTD

12345678910

3.6 Watlow MicroDIN

S1 S3

Figure 3.6d — Control Input, 3-wire RTD

12345678910

Output and Power Wiring

NOTE: The current limit feature is disabled in this version of the controller.

Figure 3.7a — Control Output, Switched DC with Internal Power Supply

dc+

COM

dc-

12345678910

External

External

Switching

Load

Device

Figure 3.7b — Control Output, Open Collector with External Power Supply

External

External

Switching Device

Figure 3.7c — Internal Output Circuitry

+24VÎ(dc)

2KΩ

20Ω

Internal Circuitry

4

dc+5dc-6COM

dc+

COM

dc-

12345678910

Power 

Supply

60V max.

1A max.

Load

Install and Wire

NOTE: Relay suppression required only for inductive loads.

Figure 3.7d — Alarm Output

N.O.

COM

12345678910

Fuse

Relay

Suppression

External

Load

Figure 3.7e — Power Wiring

10123456789

24V‡ (ac/dc)

Watlow MicroDIN 3.7

Communications Wiring

Address

Power

Comms

Alarm

Temperature Controller

MicroDIN

Temperature Controller

MicroDIN

Control Output

Input Error

Address

Power

Comms

Alarm

Temperature Controller

MicroDIN

Temperature Controller

MicroDIN

Control Output

Input Error

Address

Power

Comms

Alarm

Temperature Controller

MicroDIN

Temperature Controller

MicroDIN

Control Output

Input Error

Address

Power

Comms

Alarm

Temperature Controller

MicroDIN

Temperature Controller

MicroDIN

Control Output

Input Error

1 2 3 4

Green

RJ-11 to MicroDIN

TD (A) TD (B) RD (A) RD (B)

SIG GND

TD (A) TD (A)

Yellow

120V~

EIA-232

EIA-485

Power Supply

AD-1210

+ –

CBAD

9ÎVdc (see NOTE)

120VÅ (Vac)

Comms Plug

Red

Yellow

Yellow Green

0219-0217-0000

7 ft. comms cable

EIA232

ADA485L

EIA-485

CBAD

9VDC

DI/ODI/O

Figure 3.8a - MicroDIN communications daisy chain via RJ-11 connectors.

NOTE: If your network doesn’t function, see Chapter 2 for special

Install and Wire

EIA- 485 considerations.

Converter-To-MicroDIN Wiring Example

Figure 3.8b- B&B Converter to MicroDIN Wiring (B&B Electronics Manufacturing Company, Ph. 815-433-5100)

Figure 3.8c - CMC Converter to MicroDIN Wiring (CMC Connecticut MicroComputer, Inc. Ph. 800-426-2872)

3.8 Watlow MicroDIN

NOTE: The CMC converter requires an external power supply when used with a laptop.

Special EIA-485 Network Considerations

+5V

B A

GND

T+/R+

T-/R-

Com

1KΩ 120Ω 1KΩ

Converter box termination with pull-up and pull-down resistors.

ABCD

If your MicroDIN network needs termination and pull-up and pull-down resistors, wire them per the diagrams below. See Chapter 2, “Communications Setup.”

Figure 3.9 a- Termination for MicroDIN; RJ-11 phone plug with 120Ω resistor across C and D

120Ω

Plug terminator into open socket in MicroDIN controller furthest from computer, the last unit on the network.

RJ-11 Terminals C (green) and D (yellow)

Install and Wire

Figure 3.9b Termination for EIA-232/EIA-485 Converter with pull-up and pull-down resistors.

Watlow MicroDIN 3.9

Wiring Examples

WARNING: To avoid potential electric shock, use National Electric Code (NEC) safety practices

Install and Wire

when wiring and connecting this unit to a power source and to electrical sensors or peripheral devices. Failure to do so could result in injury or death.

Figure 3.10 System wiring example, schematic.

120VÅ (ac)

L2 Earth Ground

Temperature

UD1A-CES-0000

EIA485 to RS232

EIA485

Loop

Watlow

MicroDIN

Controller

21 345678910

Converter

0830-0474-0000

Power Supply

20A

17-8020

ModBus

Converter

Branch Circuit Fuse

High Limit

Mechanical

Contactor

Semiconductor Fuse

DA1C-1624-C000

Thermocouples

Coil

DIN-a-mite

Heater

L2L1

92A3-1DJ1-DC

High temp.

light

21 3456789

Limit Control

1110 121314151617

Optional Normally

Open

Momentary

Switch

3.10 Watlow MicroDIN

Loop EIA485

PC EIA485

120V~(ac)

0830-0474-0000

Power Supply

–

MicroDIN UD1A-1CES-0000

1CR-1

101011

Semiconductor

Fuse

3 4

DIN-a-mite

DA1C-1624-C000

–

T2T1

Figure 3.11 System wiring example, ladder diagram.

92A3-1DJ1-DC

–

92 Series

Limit Control

Optional Normally Open

Heater

1 CR

High Temp. Light

Install and Wire

Momentary Switch

Watlow MicroDIN 3.11

Notes

Install and Wire

3.12 Watlow MicroDIN

Chapter Four:

Features

The System

Auto-tune ........................................... 4.2

Power Limit ....................................... 4.3

Input

Calibration Offset ............................... 4.4

Filter Time Constant ........................... 4.5

Sensor Selection ................................ 4.6

Range Low and Range High .............. 4.6

Control Methods

On/Off ................................................ 4.7

Proportioned Control ......................... 4.8

Proportioned plus Integral (PI)

Control ............................................... 4.9

Proportioned plus Integral

plus Derivative (PID) Control ........... 4.10

Alarms

Alarm Set Points .............................. 4.11

Alarm Hysteresis ............................. 4.11

Process or Deviation Alarms ........... 4.12

Alarm Latching ................................ 4.12

Alarm Silencing ............................... 4.13

Errors

Indicator Lights ............................... 4.14

Open Loop Detect ............................ 4.14

Bumpless Transfer ........................... 4.15

Features

Watlow MicroDIN 4.1

The System

Features

Auto-tune

Auto-tuning allows the controller to explore the responsiveness of the system in order to determine an effective set of parameters for PID control. To do this it crosses an auto-tune set point five times, then controls at the normal set point using the new parameters.

Use Auto-tune Set Point (PID Group) to select the temporary set point, as a percentage of the normal set point, that the controller will tune to. Initiate or cancel the auto-tune process with Auto-tune (PID Group). The default value is 90%.

Process Set Point

Auto-tune initiated by user



Auto-tune Set Point

(default 90% of process set point)

Auto-tune complete

Figure 4.2 — Auto-tuning

Temperature



Time

4.2 Watlow MicroDIN

Power Limit

A high side power limit and low side power limit set the maximum output power within two ranges

A low side power limit limits the output to a percentage of the maximum output power while the process temperature or value is below the power limit set point.

The high side power limit limits the output to a percentage of the maximum output power while the process temperature or value is above the power limit set point.

The low side power limit can be viewed or changed with Low Side Power Limit (Control Output Group).

The high side power limit can be viewed or changed with High Side Power Limit (Control Output Group).

The power limit set point can be viewed or changed with Power Limit Set Point (Control Output Group).

The actual output power can be viewed with Output Power (Control Output Power Group).

Set Point

Figure 4.3 — Power Limits

Process

Power Limit Set Point

(between Range Low

Temperature

and Range High)

Process temperature

with no power limit

Range Low

Process Temperature with power limit



Output Power is limited to 

Low Side Power Limit

Time

Range High

Output Power switches

to High Side Power Limit

Features

Watlow MicroDIN 4.3

Input

Calibration Offset

Calibration offset allows a device to compensate for an inaccurate sensor, lead resistance or other factors that affect the input value. Apositive offset increases the input value, and a negative offset decreases the input value.

The input offset value can be viewed or changed with Calibration Offset (Input Group).

Temperature Reading 

from Sensor



Negative Calibration Offset will compensate for the difference between the Sensor Reading and the Actual Temperature.

Features

Figure 4.4 — Calibration Offset

Temperature

Actual Process Temperature

Time

4.4 Watlow MicroDIN

Filter Time Constant

A time filter smooths an input signal by sampling the input at designated time intervals. Either the viewed value or both the viewed and control values can be filtered.

View or change the time filter with Filter Time Constant (Input Group). A positive value affects only the viewed values. Anegative value affects both the viewed and control values. The filter is a single pole low pass.

Temperature

Unfiltered Input Signal

Filtered Input Signal

Temperature

Figure 4.5 — Filtered and Unfiltered Input Signals

Time

Features

Time

Watlow MicroDIN 4.5

Sensor Selection

You need to configure a controller to match the input device, which is normally a thermocouple or RTD. When you select an input device the controller automatically sets the input linearization to match the sensor. It also sets high and low limits, which in turn limit the range high and range low values.

Use Sensor Type and Input Type (Input Group) to select the appropriate sensor.

Temperature

High Limit of selected Sensor Range

Range High Range (between High Limit of Sensor and Range Low)

Range High

Set Point Range (must be between Range High and Range Low)

Range Low

Features

Figure 4.6 — Sensor Ranges

Range Low Range (between Low Limit of Sensor and Range High)

Low Limit of selected Sensor Range

Time

Range Low and Range High

The controller constrains the set point to a value between range high and range low. Range high cannot be set higher than the sensor high limit or lower than range low. Range low cannot be set lower than the sensor low limit or higher than range high.

Use Set Point (Operation Group), Range High and Range Low (Input Group) to select or view values for the corresponding parameters.

4.6 Watlow MicroDIN

Control Methods

On/Off Control

On/off control switches the output either full on or full off, depending on the input, set point and hysteresis values. The hysteresis value creates a buffer zone that increases the time interval that the output is off or on. With hysteresis set to 0 the process value would stay closer to the set point, but the output would switch on and off more frequently, causing “chattering.”

Set hysteresis with Output Hysteresis (PID Group).

Heating Action switches off when the Process Temperature

rises above the Set Point

Temperature

Process Temperature

Heating Action switches 

on at Startup

Cooling Action switches 

on at Startup

Cooling Action Switches on when the Process Temperature rises above the



Set Point



Heating Action switches on when the Process Temperature

drops below the Set Point minus the Hysteresis

Time



Set Point plus the Hysteresis

Hysteresis

Features

Process Temperature

Temperature

Cooling Action Switches off when the Process Temperature 

drops below the Set Point

Figure 4.7 — On/Off Control for Heating and Cooling

Hysteresis

Set Point



Time

Watlow MicroDIN 4.7

Proportional Control

Some processes need to maintain a temperature or process value closer to the set point than on/off control can provide. Proportional control provides closer control by adjusting the output when the temperature or process value is within a proportional band. When the value is in the band, the controller adjusts the output based on how close the process value is to the set point: the closer to set point the lower the output. This is similar to backing off on the gas pedal of a car as you approach a stop sign. It keeps the temperature or process value from swinging as widely as it would with simple on/off control. However, when a system settles down, the temperature or process value tends to “droop” short of the set point.

The proportional band can be viewed or changed with Propband (PID Group). To only view the proportional control value use Proportional Term (PID Group).

Features

Figure 4.8 — Proportional Control

Temperature

Set Point

Overshoot



Proportional Band

Droop



Time

4.8 Watlow MicroDIN

Proportional plus Integral (PI) Control

The droop caused by proportional control can be corrected by adding integral (reset) control to the system. When the system has settled down the integral (reset) value is tuned to bring the temperature or process value closer to the set point. However, this may increase the overshoot that occurs at startup or when the set point is changed. Used more with fast, high loss loads.

View or change the integral or reset value with Integral or Reset. To only view the integral control value use Integral Term (PID Group).

Overshoot

Set Point

Proportional Band



Droop Corrected

Temperature

Figure 4.9 — Proportional plus Integral Control



Features

Time

Watlow MicroDIN 4.9

Proportional plus Integral plus Derivative (PID) Control

Use derivative (rate) control to minimize the overshoot in a PI-controlled system. Derivative (rate) adjusts the output based on the rate of change in the temperature or process value. Used more with slow, lagging loads.

View or change derivative or rate with Derivative or Rate (PID Group). To only view the derivative control value use Derivative Term (PID Group).

Reduced Overshoot

Set Point



Proportional Band

Features

Figure 4.10 — PID Control

Temperature



Time

4.10 Watlow MicroDIN

Alarms

An alarm takes some action, usually notifying an operator, when the process temperature leaves a defined range. Auser can configure how and when an alarm is triggered and whether it turns off automatically when the alarm condition is over.

Figure 4.11 — Alarm Settings

Alarm Set Points

High Side Alarm Range

Alarm Hysteresis

Normal Operating Range

Temperature

Alarm Hysteresis

Low Side Alarm Range

Time

The alarm high set point defines the temperature or process value that will trigger a high side alarm. The alarm high set point must be higher than the alarm low set point and lower than the high limit of the sensor range.

The alarm low set point defines the temperature or process value that will trigger a low side alarm. The alarm low set point must be lower than the alarm high set point and higher than the low limit of the sensor range.

Alarm set points or deviation can be viewed or changed with Alarm High and Alarm Low (Alarm Output Group).

Alarm High Set Point

Alarm Low Set Point

Features

Alarm Hysteresis

Alarm hysteresis is a zone defined by adding an hysteresis value to the alarm low set point or subtracting the hysteresis value from the alarm high set point.

Once an alarm has occurred it will not clear until the process value is above the alarm-low setting or below the alarm-high settings by a margin equal to the hysteresis. Example: An alarm starts when the process value reaches the alarm high setting. The alarm will not clear until it is below the high setting by an amount equal to or greater than the alarm hysteresis.

The alarm hysteresis value can be viewed or changed with Alarm Hysteresis (Alarm Output Group).

Watlow MicroDIN 4.11

Process or Deviation Alarms

A process alarm uses one or two fixed set points to define an alarm condition. A deviation alarm uses one or two set points that are defined relative to the

control set point. High and low alarm set points are calculated by adding and/or subtracting offset values from the control set point. If the set point changes, the alarm set points automatically change with it.

Alarm Type (Alarm Output Group) allows you to view or change whether the alarm will function as a process or deviation alarm.

The alarm deviation value can be viewed or changed with Alarm High and Alarm Low (Alarm Output Group).

Alarm Latching

A latched alarm will remain active after the alarm condition has passed. It can only be deactivated by the user. An alarm that is not latched will deactivate automatically when the alarm condition has passed.

Alarm Latching Mode (Alarm Output Group) allows you to view or change whether an alarm will latch.

The alarm state begins when the temperature reaches the alarm high set point.

Features

Figure 4.12 — Alarm Latching

Temperature

Process 

Alarm High Set Point

Normal Operating Range

The alarm state continues until the  temperature drops to the alarm high set point minus the hysteresis. A latching alarm could be turned off by the operator at this point. A nonlatching alarm would turn off automatically.

Alarm Low Set Point

Time

4.12 Watlow MicroDIN

Alarm Silencing

Alarm silencing has two uses:

1. It is often used to allow a system to warm up after it has been started up. With alarm silencing on, an alarm is not triggered when the process temperature is initially lower that the alarm low set point. The process temperature has to enter the normal operating range beyond the hysteresis zone in order to activate the alarm function.

2. Alarm silencing also allows the operator to disable the alarm output while the controller is in an alarm state. The process temperature has to enter the normal operating range beyond the hysteresis zone in order to activate the alarm function.

Alarm Silencing Mode (Alarm Output Group) allows you to view or change whether alarm silencing is on.

Temperature

Alarm 

enabled 

here

Process 

Temperature

Alarm High Set Point

Normal Operating Range

Features

Figure 4.13 — Alarm Silencing

Startup,

Alarm

disabled

Time

Alarm 

triggered 

here

Alarm Low Set Point

Watlow MicroDIN 4.13

Errors Panel Indicator Lights

Figure 4.14 - Error Information

Features

MicroDIN

Temperature Controller

Power

Comms

Control Output

Alarm

Input Error

Address

Error Information — Unison Green/Red Flashing Code

ERROR 4 5 6 7 11 12 13 14 15

Error 4 RAM malfunction (return to factory) Error 5 EEPROM data corrupted Error 6 PROM malfunction (return to factory) Error 7 SPI failure, onboard peripheral hardware not responding Error 11 New software installed (cycle power to correct) Error 12 Cal EEROM checksum, calibration data corrupted (recalibrate) Error 13 A-to-D hardware fail, A-to-D hardware not responding

(return to factory)

Error 14 EEROM hardware fail, EEPROM peripheral not responding

(return to factory)

Error 15 New unit, displays on first power up (return to factory)

Open Loop Detect

4.14 Watlow MicroDIN

Open loop detect can alert the user of trouble on the input or output side of the control loop. An open loop error is triggered when 100 percent power is applied at the control output for a period of time equal to the setting of integral (PID Group), or when reset without the input registering a 5° (F or C) change.

If an open loop error occurs, shut down the system, check the input and control output wiring and check the input and output devices.

The open loop detect feature can be turned on or off with Activate Open Loop Detect (Error Group). Use Open Loop Error (Error Group) to check for an open loop condition.

Bumpless Transfer

When the sensor opens (fails), the MicroDIN switches from automatic to manual operation.

When transferring from automatic to manual operation, the control output, or outputs, remain stable — a bumpless, or smooth, transition.

If the Input Error Action parameter is set to 0, bumpless transfer, and the process has stabilized at a power level less than 75% ( ± 5%) for a two-minute period prior to the sensor break, then the MicroDIN switches to manual operation at the last automatic power level. If these conditions are not met, the output goes to 0% power (output disabled).

If the Input Error Action parameter is set to Fixed Manual Output, the MicroDIN switches to manual operation at the Fixed Manual Output percent power value.

Manual operation provides open-loop control of the outputs from a range of

-100% to 100% output. The MicroDIN allows a negative output value only when Output 1 is set to cool.

Automatic operation provides closed-loop on/off or PID control. When the operator transfers from a closed loop to an open loop, the MicroDIN sets the power level to the setting of the Input Error Action parameter. If Input Error Action is set to 0, bumpless transfer, the controller retains the power level from the closed-loop control. When the MicroDIN returns to closed-loop control, it restores the previous set point process value.

Figure 4.15 — Bumpless Transfer

Set Point

Power

Temperature

100%



Actual Temperature



Output Power

Time

≤75% power

2 min.



Features

Tie Break

Locks in Output Power

Watlow MicroDIN 4.15

Notes

Features

4.16 Watlow MicroDIN

Chapter Five

Learn the Parameters

System Group ............5.2

Ambient (CJC) Temperature (1500).

Non-volatile Memory (24).............. 5.2

Units Type (900) ............................. 5.3

C or F (901)..................................... 5.3

Decimal Point (606) ........................ 5.3

5.2

Input Group ...............5.4

Input Actual (100) .......................... 5.4

Input Error (101) ............................ 5.4

Sensor Type (600) ........................... 5.5

Input Type (601) ............................. 5.5

Range Low (602) ............................. 5.6

Range High (603)............................ 5.6

Calibration Offset (605) ................. 5.6

Filter Time Constant (604)............ 5.7

Input Error Action (902)................ 5.7

Control Output Group....5.8

Output Power (103)........................ 5.8

Control Output Hardware (16) ...... 5.8

Control Output Function (700) ...... 5.8

Power Limit Set Point (713).......... 5.9

High Side Power (714) ................... 5.9

Low Side Power (715)................... 5.10

Fixed Manual Output (903)......... 5.10

Operation Group........5.11

Operation Mode (200)................... 5.11

User Operation Mode (301).......... 5.11

User Set Point (300)..................... 5.12

Manual Output Power (310)........ 5.12

PID Group................5.13

PID Output Power (204).............. 5.13

Auto-tune Set Point (304)............ 5.13

Initiate Auto-tune (305) ............... 5.14

Proportional Band (500)............... 5.14

Integral (501)................................ 5.14

Reset (502).................................... 5.15

Derivative (503)............................ 5.15

Rate (504)...................................... 5.15

Cycle Time (506) ........................... 5.16

Control Output Hysteresis (507). 5.16

Alarm Output Group....5.17

Alarm Condition (106).................. 5.17

Alarm Output Hardware (17) ...... 5.18

Clear Alarm On/Off (331)............. 5.18

Silence Alarm On/Off (332).......... 5.18

Alarm Low (321) ........................... 5.19

Alarm High (322) ........................ 5.19

Alarm Output Function (717)...... 5.20

Alarm Type (719).......................... 5.20

Alarm Hysteresis (720)................ 5.20

Alarm Active Sides (723).............. 5.20

Alarm Latching Mode (721) ......... 5.21

Alarm Silencing Mode (722) ........ 5.21

Alarm Logic (724)......................... 5.21

Error Group..............5.22

Open Loop Error (210)................. 5.22

Open Loop Detect (904)................ 5.22

Input Error (101) .......................... 5.23

System Error (209)....................... 5.23

Clear Error (311).......................... 5.23

Input Error Action (902).............. 5.24

Error Clearing Mode (607)........... 5.24

Characteristics Group..5.25

Date of Manufacture (5)............... 5.25

Ship Date (6)................................. 5.25

Serial Number 1 (1)...................... 5.25

Serial Number 2 (2)...................... 5.26

Software ID Number (3) .............. 5.26

Software Revision (4) ................... 5.26

Diagnostics Group......5.27

Model Number (0) ........................ 5.27

Ambient (CJC) A-to-D Counts (1501)

Input A-to-D Counts (1504)........ 5.27

RTD Lead Compensation Analog-to-

Digital Counts (1502).............. 5.28

RTD Lead Resistance (1503) ....... 5.28

Proportional Term (205)............... 5.28

Integral Term (206) ...................... 5.28

Derivative Term (207) .................. 5.29

Enter Diagnostics Mode (1512) ... 5.29

Test Displays (1513)..................... 5.29

Test Outputs (1514) ...................... 5.29

5.27

Calibration Group ......5.30

Enter Calibration Mode (1600).... 5.30

Calibration Commands (1603)..... 5.30

Restore to Factory

Calibration (1601).................... 5.31

Reset Factory Defaults (1602)..... 5.31

Parameters

Watlow MicroDIN 5.1

System Group continued

System Group

Monitor

Ambient (CJC) Temperature .................... 5.2

Use

Non-volatile Memory ................................. 5.2

Setup

Units Type ................................................. 5.3

C or F ......................................................... 5.3

Decimal Point ............................................ 5.3

CAUTION: Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

See Disable Nonvolatile Memory

Parameters

(System Group).

System Group – Monitor

System Error

• See Error Group.

Ambient (CJC) Temperature

• Read the ambient temperature in 0.1 degrees Fahrenheit.

• Read only

• Modbus: 1500

Range

0.0 to 180.0 F

Default

none

Active

always

System Group – Use

Non-volatile Memory

• Disable storage of parameters to non-volatile (EEPROM) memory. This allows you to change parameters frequently without wearing out the memory.

• Read/write

• Modbus: 24

Range

0: store parameters when they are changed 1: do not store parameters when they are changed

Default

0 (always reverts to 0 when the controller’s power is turned off and on)

Active

always

Affects

all parameters will not save any parameters when set to 1.

5.2 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

System Group continued

System Group – Setup

Units Type

• Select US or SI units of measurement.

• Read/write

• Modbus: 900

Range

0: US (reciprocate integral term) 1: SI (reciprocate integral term)

Default

0: US

Active

always

Affects

Propband, Integral and Reset (PID Group) converts Reset and Integral (changes span to degrees or vice

versa)

C or F

• Select the temperature scale for the input.

• Read/write

• Modbus: 901

Range

0: F (Fahrenheit) 1: C (Celsius)

Default

0: F

Active

always

Decimal Point

• Sets the position of the decimal point for input readings.

• Read/write

• Modbus: 606

Range

0: decimal 0000 (for thermocouple and RTD) 1: decimal 000.0 (for for thermocouple and RTD)

Default

Active

if Sensor Type (Input Group) is set to RTD or thermocouple

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.3

Parameters

Input Group

Monitor

Input Actual ............................................... 5.4

Input Error ................................................ 5.4

Setup

Sensor Type ............................................... 5.5

Input Type ................................................. 5.5

Range Low ................................................. 5.6

Range High ................................................ 5.6

Calibration Offset ...................................... 5.6

Filter Time Constant ................................ 5.7

Input Error Action ..................................... 5.7

CAUTION: Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

Parameters

See Disable Nonvolatile Memory (System Group).

Input Group – Monitor

Input Actual

• Monitor the input value.

• During an input error state, this will read 9999 if Read Control Output (Control Output Group) is set to heat or -1999 if it is set to cool.

• Read only

• Modbus: 100

Range

input type range

Default

none

Active

always

Input Error

• Monitor the input error status.

• Read only

• Modbus: 101

Range

0: no error 1: analog-to-digital signal under range 2: sensor under range 3: sensor over range 4: analog-to-digital over range

Default

none

Active

always

5.4 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Input Group continued

Input Group – Setup

Sensor Type

• Select the input sensor type.

• Read/write

• Modbus: 600

Range

0: thermocouple 1: RTD

Default

0: thermocouple

Active

always

Affects

Changes Input Type (Input Group) to J for thermocouple, DIN

for RTD, and defaults temperature related parameters.

Input Type

• Set the linearization for the input sensor.

• Read/write

• Modbus: 601

Range

if Sensor Type (Input Group) set to thermocouple

0: J 1: K 2: T 3: E 4: N 5: C 6: D 7: PT2 8: R 9: S 10: B

if Sensor Type (Input Group) set to RTD

11: RTD_DIN 12: RTD_JIS

Default

if Sensor Type (Input Group) is changed to thermocouple: J if Sensor Type (Input Group) is changed to RTD: DIN

Active

always

Affected by

Changing Sensor Type sets to J for thermocouple, DIN for RTD,

and defaults temperature related parameters

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.5

Parameters

Input Group continued

Range Low

• Set the input range low. This setting is the lowest value that the set point can have.

• Read/write

• Modbus: 602

Range

see Sensor Table in the Appendix for sensor ranges and defaults

Default

see Sensor Table in the Appendix for sensor ranges and defaults

Active

always

Affects

Set Point (Operation Group) limits the set point to the range

between Range Low and Range High (Input Group)

Range High

• Set the input range high. This setting is the highest value that the set point can have.

• Read/write

• Modbus: 603

Range

see Sensor Table in the Appendix for sensor ranges and defaults

Default

see Sensor Table in the Appendix for sensor ranges and defaults

Active

always

Affects

Set Point (Operation Group) limits the set point to the range

between Range Low and Range High (Input Group)

Calibration Offset

• Set the input calibration offset. This allows you to compensate for lead resistance, sensor errors and other factors.

• Read/write

• Modbus: 605

Range

-1999 to 9999

Default

Active

always

5.6 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Input Group continued

Filter Time Constant

• Set the filter time for the input, in seconds. This smooths out a rapidly changing input signal. Positive values affect the monitor readings only. Negative values affect both the monitor readings and the control values.

• Read/write

• Modbus: 604

Range

-60.0 to 60.0

Default

0.0

Active

always

Input Error Action

• Select how the controller responds to an input error.

• Read/write

• Modbus: 902

Range

0: bumpless transfer (control output power remains constant,

see Chapter 5)

1: switch to the Fixed Manual Output (Control Output Group)

setting

2: shut off output

Default

0: bumpless transfer

Active

always

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.7

Parameters

Control Output Group

Monitor

Output Power .............................................. 5.8

Control Output Hardware .......................... 5.8

Setup

Control Output Function ............................ 5.8

Power Limit Set Point ................................. 5.9

High Side Power .......................................... 5.9

Low Side Power ........................................... 5.9

Fixed Manual Output ................................ 5.10

CAUTION: Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

See Disable Non-

Parameters

volatile Memory (System Group).

Control Output Group – Monitor

Output Power

• Monitor the control output power level. This can limit PID Output Power (PID Group).

• Read only

• Modbus: 103

Range

heat: 0.0 to 100.0 cool: -100.0 to 0.0

Default

none

Active

always

Control Output Hardware

• Read the control output hardware type.

• Read only

• Modbus: 16

Range

3: dc

Default

Active

always

Control Output Group – Setup

Control Output Function

• Select whether the control output will control for heating or cooling.

• Read/write

• Modbus: 700

5.8 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Control Output Group continued

Range

0: heat 1: cool

Default

0: heat

Active

always

Affects

Manual Output Power (Operation Group) determines heat or

cool values.

High Side Power, Low Side Power or Fixed Manual Output

(Control Output Group) changes range

Power Limit Set Point

• Select the set point that High Side Power and Low Side Power (Control Output Group) will use to limit the control output range.

• Read/write

• Modbus: 713

Range

Range Low to Range High (Input Group) values

Default

Range High

Active

always

High Side Power

• Set the maximum allowed power above the Power Limit Set Point (Control Output Group).

• Read/write

• Modbus: 714

Range

heat: 0.0 to 100.0 cool: -100.0 to 0.0

Default

heat: 100.0 cool: -100.0

Active

always

Affected by

Changing Control Output Function (Control Output Group)

changes range.

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.9

Parameters

Control Output Group continued

Low Side Power

• Set the maximum allowed power below the Power Limit Set Point (Control Output Group).

• Read/write

• Modbus: 715

Range

heat: 0.0 to 100.0 cool: -100.0 to 0.0

Default

heat: 100.0 cool: -100.0

Active

always

Affected by

Changing Control Output Function (Control Output Group)

changes range

Fixed Manual Output

• Select the initial control output power to take effect when the controller is switched to manual mode by either the user or an error.

• Read/write

• Modbus: 903

Range

heat: 0.0 to 100.0 cool: -100.0 to 0.0

Default

0.0

Active

always

Affected by

Changing Control Output Function (Control Output Group)

changes range

5.10 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Control Output Group continued

Operation Group

Monitor

Operation Mode ......................................... 5.11

Use

Operation Mode ......................................... 5.11

User Set Point ........................................... 5.12

Manual Output Power .............................. 5.12

CAUTION: Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

See Disable Nonvolatile Memory (System Group).

Operation Group – Monitor

Operation Mode

• Monitor the operation mode. Normally follows the user selected mode. It returns to the previous state after an error clears.

• Read only

• Modbus: 200

Range

0: off 1: auto 2: manual control (user selected) 3: manual control (due to error)

Default

auto

Active

always

Operation Group – Use

User Operation Mode

• Select whether the controller is under auto or manual control.

• Read/write

• Modbus: 301

Range

0: auto 1: manual

Default

0: auto

Active

always

Affects

Manual Output Power (Operation Group) manual or manual due

to error

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.11

Operation Group continued

User Set Point

• Change or monitor the control set point.

• Read/write

• Modbus: 300

Range

Range Low to Range High (Input Group)

Default

75°F, 24°C

Active

if Operation Mode (Operation Group) is set to auto

Affected by

Changing Sensor Type (Input Group) determines range of setting

and default

Changing Input Type (Input Group) determines range of setting

and default

Changing Range Low (Input Group) determines range of setting

and default

Changing Range High (Input Group) determines range of setting

and default

Changing C or F (System Group) determines range of setting

and default

Parameters

Manual Output Power

• Set the control output power manually.

• Read/write

• Modbus: 310

Range

0.0 to 100.0: heat mode

-100.0 to 0.0: cool mode

Default

0.0

Active

if Operation Mode (Operation Group) is set to manual or switches to manual due to error

Affected by

Changing Operation Mode (Operation Group) to manual or

manual due to error

Changing Control Output Function (Alarm Output Group)

determines range of setting

5.12 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

PID Group

Monitor

PID Output Power ..................................... 5.13

Initiate Auto-tune ...................................... 5.14

Setup

Auto-tune Set Point .................................. 5.13

Proportional Band ..................................... 5.14

Integral ...................................................... 5.14

Reset ........................................................... 5.15

Derivative .................................................. 5.15

Rate ............................................................ 5.15

Cycle Time ................................................. 5.15

Control Output Hysteresis ....................... 5.16

PID Group – Monitor

CAUTION: Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

See Disable Nonvolatile Memory (System Group).

PID Output Power

• Monitor the calculated PID power level. See Chapter 4 for information about PID control.

• Read only

• Modbus: 204

Range

heat: 0.0 to 100.0 cool: -100.0 to 0.0

Default

none

Active

always

PID Group – Use

Auto-tune Set Point

• Set the auto-tune set point as a percent of the currently active set point.

• Read/write

• Modbus: 304

Range

50 to 150

Default

Active

always

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.13

Parameters

PID Group continued

Initiate Auto-tune

• Initiate or cancel an auto-tune.

• Read/write

• Modbus: 305

Range

0: off or cancel an auto-tune in progress 1: initiate an auto-tune

Default

0: off

Active

if Operation Mode (Operation Group) is set to auto

Affected by

Changing Operation Mode (Operation Group) available when

mode is set to auto

PID Group – Setup

Proportional Band

• Set the proportional band for PID control. See Chapter 4 for information about PID control.

• Read/write

• Modbus: 500

Range

0: on/off control mode 1-9999°F or °C: proportional control mode

Default

25ºF, 17ºC

Active

always

Integral

• Set the integral time for PID control. See Chapter 4 for information about PID control.

• Read/write

• Modbus: 501

Range

0.00 to 99.99 minutes

Default

0.00

Active

if Propband (PID Group) is not set to 0 and Units Type (System Group) is set to SI

Affected by

Changing Units Type (System Group) will convert Integral to Reset.

Reset

• Set the reset time for PID control. See Chapter 4 for information

5.14 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

PID Group continued

about PID control.

• Read/write

• Modbus: 502

Range

0.00 to 99.99 minutes per repeat

Default

0.00

Active

if Propband (PID Group) is not set to 0 and Units Type (System Group) is set to US

Affected by

Changing Units Type (System Group) will convert Integral to

Reset.

Derivative

• Set the derivative time for PID control. See Chapter 4 for information about PID control.

• Read/write

• Modbus: 503

Range

0.00 to 9.99 minutes

Default

0.00

Active

if Propband (PID Group) is not set to 0 and Units Type (System Group) is set to SI

Rate

• Set the rate time for PID control. See Chapter 4 for information about PID control.

• Read/write

• Modbus: 504

Range

0.00 to 9.99 minutes

Default

0.00

Active

if Propband (PID Group) is not set to 0 and Units Type (System Group) is set to US

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.15

PID Group continued

Cycle Time

• Set the control output cycle time in seconds.

• Read/write

• Modbus: 506

Range

0.1 to 60.0 seconds

Default

2.0

Active

if Propband (PID Group) is not set to 0 and Units Type (System Group) is set to US

Control Output Hysteresis

• Set the control output switching hysteresis.

• Read/write

• Modbus: 507

Range

1 to 9999°F or °C

Default

Active

only if Propband is set to 0

Parameters

5.16 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

PID Group continued

Alarm Output Group

Monitor

Alarm Condition ........................................ 5.17

Alarm Output Hardware .......................... 5.17

Use

Clear Alarm ............................................... 5.18

Silence Alarm ............................................ 5.18

Setup

Alarm Low ................................................. 5.18

Alarm High ................................................ 5.19

Alarm Output Function ............................ 5.19

Alarm Type ................................................ 5.19

Alarm Hysteresis ....................................... 5.20

Alarm Active Sides .................................... 5.20

Alarm Latching Mode ............................... 5.20

Alarm Silencing Mode ............................... 5.21

Alarm Logic ............................................... 5.21

CAUTION: Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

See Disable Nonvolatile Memory (System Group).

Alarm Output Group – Monitor

Alarm Condition

• Monitor the alarm state.

• Read only

• Modbus: 106

Range

0: no alarm 1: high alarm 2: low alarm 3: high latched alarm 4: low latched alarm 5: high silenced alarm 6: low silenced alarm 7: high latched silenced alarm 8: low latched silenced alarm 9: waiting for in range alarm 10: disabled alarm 11 error alarm

Default

none

Active

always

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.17

Alarm Output Group continued

Alarm Output Hardware

• Read the alarm output hardware type.

• Read only

• Modbus: 17

Range

1: mechanical relay

Default

Active

always

Alarm Output Group – Use

Parameters

Clear Alarm

• Alarm will clear if alarm condition is resolved

• Read/write

• Modbus: 331

Range

0: no action 1: try to clear a latched alarm

Default

0 (always reverts to 0 after a write)

Active

if Alarm Latching Mode (Alarm Output Group) is set to yes

Silence Alarm

• Silence the alarm manually.

• Read/write

• Modbus: 332

Range

0: no action 1: silence alarm

Default

0 (always reverts to 0 after a write)

Active

always

5.18 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Alarm Output Group continued

Alarm Output Group – Setup

Alarm Low

• Set the low alarm set point.

• Read/write

• Modbus: 321

Range

process: sensor range low to Alarm High (Alarm Output Group) deviation: -1999 to -1

Default

process: sensor range low deviation: -1999

Active

if Alarm Output Function (Alarm Output Group) is set to alarm

Affected by

Sensor Type (Input Group) determines range of setting and

default.

Input Type (Input Group) determines range of setting and

default.

Alarm Type (Alarm Output Group) determines range of setting

and default.

C or F (System Group) converts and determines range of setting.

Alarm High

• Set the high alarm set point

• Read/write

• Modbus: 322

Range

Default

Active

Affected by

process: Alarm Low (Alarm Output Group) to sensor range high deviation: 1 to 9999

process: sensor range high deviation: 9999

if Alarm Output Function (Alarm Output Group) is set to alarm

Sensor Type (Input Group)

determines range of setting and default

Input Type (Input Group)

determines range of setting and default

Alarm Type (Alarm Output Group)

determines range of setting and default

C or F (System Group)

converts and determines range of setting

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.19

Parameters

Alarm Output Group continued

Alarm Output Function

• Turn the alarm output on or off.

• Read/write

• Modbus: 717

Range

0: off 1: alarm

Default

0: off

Active

always

Alarm Type

• Select alarm type. A process alarm responds when the temperature leaves a fixed range. Adeviation alarm responds when the temperature deviates from the set point by a set number of degrees.

• Read/write

• Modbus: 719

Range

0: process alarm 1: deviation alarm

Default

0: process

Active

if Alarm Output Function (Alarm Output Group) is set to alarm

Affects

Alarm Low (Alarm Output Group) changes to sensor low for

process alarms or -1999 for deviation alarm.

Alarm High (Alarm Output Group) changes to sensor high for

process alarms or 9999 for deviation alarm.

Alarm Hysteresis

• Sets the switching hysteresis for the alarm output. This defines a band on the inside of the alarm set point. When the process temperature is in this band, the alarm state will not change.

• Read/write

• Modbus: 720

Range

1 to 9999

Default

Active

if Alarm Output Function (Alarm Output Group) is set to alarm

Alarm Active Sides

• Select which side or sides the alarm is active on.

• Read/write

• Modbus: 723

5.20 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Alarm Output Group continued

Range

0: both 1: high side only 2: low side only

Default

0: both

Active

if Alarm Output Function (Alarm Output Group) is set to alarm

Alarm Latching Mode

• Turn alarm latching on or off. When latching is active, the alarm will remain on after the alarm condition ends. It must be turned off manually.

• Read/write

• Modbus: 721

Range

0: no 1: yes

Default

0: no

Active

if Set Alarm Output Function (Alarm Output Group) is set to alarm

Alarm Silencing Mode

• Turn alarm silencing on or off. When silencing is active and the controller is first turned on, the alarm cannot become active until the process temperature leaves the alarm range. Also, alarms can be manually silenced after one occurs. Entering the normal operation range resets the silence.

• Read/write

• Modbus: 722

Range

0: no 1: yes

Default

0: no

Active

if Alarm Output Function (Alarm Output Group) is set to alarm

Alarm Logic

• Select alarm output logic.

• Read/write

• Modbus: 724

Range

0: alarm condition de-energizes output (open) 1: alarm condition energizes output (closed)

Default

Active

if Alarm Output Function (Alarm Output Group) is set to alarm

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.21

CAUTION: Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

See Disable Nonvolatile Memory (System Group).

Parameters

Error Group continued

Error Group

Monitor

Open Loop Error ........................................ 5.22

Open Loop Detect ...................................... 5.22

Input Error ................................................ 5.22

System Error ............................................. 5.23

Use

Clear Error ................................................ 5.23

Setup

Input Error Action ..................................... 5.24

Error Clearing Mode ................................. 5.24

Error Group – Monitor

Open Loop Error

• Read the open loop error status. An open loop indicates that the output is not responding appropriately to the input.

• Read only

• Modbus: 210

Range

0: no error 1: open loop error detected

Default

none

Active

always

Open Loop Detect

• Turn the open loop detect feature on or off.

• Read/write

• Modbus: 904

Range

0: off 1: on

Default

0: off

Active

always

Affects

Read Open Loop Error (Error Group) must be on to activate

Read Open Loop Error

5.22 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Error Group continued

Input Error (see also Input Group)

• Monitor the input error status.

• Read only

• Modbus: 101

Range

0: no error 1: analog-to-digital signal under range 2: sensor under range 3: sensor over range 4: analog-to-digital over signal range

Default

none

Active

always

System Error

• Read the system error status.

• Read only

• Modbus: 209

Range

0: no error 4: RAM error 5: non-volatile checksum error 6: PROM error 7: hardware failure 11: software version change 12: calibration checksum error 13: analog-to-digital failure 14: non-volatile hardware failure 15: new unit

Default

none

Active

always

Parameters

Error Group – Use

Clear Error

• Try to clear a latched input error.

• Read/write

• Modbus: 311

Range

0: no action 1: try to clear latched input error

Default

0 (always reverts after a write)

Active

always

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.23

Parameters

Error Group continued

Error Group – Setup

Input Error Action (see also Input Group)

• Select how the controller responds to an input error.

• Read/write

• Modbus: 902

Range

0: bumpless transfer (control output power remains constant,

Chapter 4)

1: switch to the Fixed Manual Output (Control Output Group) setting 2: shut off output

Default

0: bumpless transfer

Active

always

Error Clearing Mode

• Set the error clearing mode. When errors are latched, the error message or indicator persists until it has been cleared manually. Otherwise the error message or indicator clears automatically when the condition that caused it no longer exists.

• Read/write

• Modbus: 607

Range

0: not latched (errors clear automatically) 1: latched (errors must be cleared manually)

Default

0: errors clear automatically

Active

always

5.24 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Characteristics Group continued

Characteristics Group

Date of Manufacture ................................. 5.25

Ship Date ................................................... 5.25

Serial Number 1 ........................................ 5.25

Serial Number 2 ........................................ 5.26

Software ID Number ................................. 5.26

Software Revision ...................................... 5.26

Date Of Manufacture

• Read the manufacture date as week/year (WWYY).

• Read only

• Modbus: 005

Range

0596-9999 (5th week of 1996 to 52nd week of 1999)

Default

none

Active

always

Ship Date

• Read the ship date as week/year (WWYY).

• Read only

• Modbus: 006

Range

0596-9999 (5th week of 1996 to 52nd week of 1999)

Default

none

Active

always

Serial Number 1

• Read the first four digits of the serial number.

• Read only

• Modbus: 001

Range

0-9999

Default

Active

always

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.25

Characteristics Group continued

Serial Number 2

• Read the last four digits of the serial number.

• Read only

• Modbus: 002

Range

0-9999

Default

Active

always

Software ID Number

• Read the software ID number.

• Read only

• Modbus: 003

Range

0 to 9999

Default

none

Active

always

Parameters

Software Revision

• Read software revision number.

• Read only

• Modbus: 004

Range

0.00 to 99.99

Default

none

Active

always

5.26 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

CAUTION: Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

See Disable Nonvolatile Memory (System Group).

Diagnostics Group continued

Diagnostics Group

Model Number ........................................... 5.27

Ambient (CJC) A-to-D Counts .................. 5.27

Input A-to-D Counts .................................. 5.27

RTD Lead Compensation Ato D Counts . 5.28

RTD Lead Resistance ................................ 5.28

Proportional Term ..................................... 5.28

Integral Term ............................................. 5.28

Derivative Term ......................................... 5.29

Enter Diagnostics Mode ............................ 5.29

Test Displays ............................................. 5.29

Test Outputs .............................................. 5.29

Model Number

• Read the model number of the controller.

• Read only

• Modbus: 000

Range

8568 (ASCII ‘uD’)

Default

none

Active

always

Ambient (CJC) A-to-D Counts

• Read the raw ambient channel, analog-to-digital signal counts.

• Read only

• Modbus: 1501

Range

0 to 65535

Default

none

Active

always

Parameters

Input A-to-D Counts

• Read the raw input analog-to-digital converter counts.

• Read only

• Modbus: 1504

Range

0 to 65535

Default

none

Active

always

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.27

Diagnostics Group continued

RTD Lead Compensation Analog-to-Digital Counts

• Reads the raw, RTD lead compensation, analog-to-digital converter counts.

• Read only

• Modbus: 1502

Range

0 to 65535

Default

none

Active

always

RTD Lead Resistance

• Reads the measured RTD lead resistance in 0.01 ohms.

• Read only

• Modbus: 1503

Range

0.00 to 99.99

Default

none

Active

always

Parameters

Proportional Term

• Monitor the proportional term. See Chapter 4 for information about PID control.

• Read only

• Modbus: 205

Range

-100.0 to 100.0

Default

none

Active

always

Integral Term

• Monitor the integral term. See Chapter 4 for information about PID control.

• Read only

• Modbus: 206

Range

heat: 0.0 to 100.0 cool: -100.0 to 0.0

Default

none

Active

always

5.28 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Diagnostics Group continued

Derivative Term

• Monitor the derivative term. See Chapter 4 for information about PID control.

• Read only

• Modbus: 207

Range

-100.0 to 100.0

Default

none

Active

always

Enter Diagnostics Mode (Set)

• Enter the diagnostics mode to test indicator lights and outputs and to enter the calibration mode.

• Read/write

• Modbus: 1512

Range

0 to 1788 and 1790 to 9999: exit the diagnostics mode 1789: enter the diagnostics mode

Default

Active

always

Test Displays

• Test the indicator lights on the front panel.

• Read/write

• Modbus: 1513

Range

0: turn off all indicator lights 1: turn on the cyclic display test

Default

Active

if the controller is in the diagnostics mode

Test Outputs

• Test both outputs.

• Read/write

• Modbus: 1514

Range

0: turn both outputs off 1: turn the control output on and the alarm output off 2: turn the control output off and the alarm output on

Default

Active

if the controller is in diagnostics mode

Parameters

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.29

Calibration Group continued

NOTE:

See page

6.6 for the

calibration procedures.

CAUTION: Avoid writing continuously to EEPROM memory. Continuous writes may result in premature control failure, system downtime and damage to processes and equipment.

See Disable Nonvolatile Memory (System Group).

Parameters

Calibration Group

Enter Calibration Mode ............................ 5.30

Calibration Commands ............................. 5.30

Restore Factory Calibration .................... 5.30

Reset Factory Defaults............................... 5.31

Enter Calibration Mode

• Enter calibration mode, to calibrate the controller.

• Must be in diagnostics mode to enter calibration mode

• Read/write

• Modbus: 1600

Range

0 to 1414 and 1416 to 9999: exit calibration mode 1415: enter calibration mode

Default

Active

if the controller is in diagnostics mode

Calibration Commands

• Measure and store a selected input calibration value.

• Write

• Modbus: 1603

Range

0: no calibration 1: store 0.000mV input 2: store 50.000mV input 3: store CJC input (32°F Type J, compensated) 4: store ground input (S1, S2 and S3 shorted) 5: store RTD lead resistance (S1 and S2 shorted) 6: store 15.00 ohms 7: store 380.00 ohms 10: store 4mA input

Default

Active

if the controller is in calibration mode.

5.30 Watlow MicroDIN =Read Only; =Read/Write; = Turn On/Off

Calibration Group continued

Restore to Factory Calibration (Set)

• Restore factory calibration values from the backup memory.

• Write

• Modbus: 1601

Range

0: no action 1: restore factory calibration

Default

0 (always reads 0)

Active

if the controller is in the calibration mode

Reset Factory Defaults (Set)

• Reset all parameters to factory values.

• Read/write

• Modbus: 1602

Range

0 to 799 and 801 to 999: no action 800: reset parameters to factory values

Default

Active

if the controller is in calibration mode

=Read Only; =Read/Write; = Turn On/Off Watlow MicroDIN 5.31

Parameters

Notes

Parameters

5.32 Watlow MicroDIN

Chapter Six:

Operation and Calibration

MicroDIN Startup ..................................... 6.2

MicroDIN Shutdown ................................ 6.3

Troubleshooting Alarms and Errors ......... 6.4

Calibrating the MicroDIN ......................... 6.6

Watlow MicroDIN 6.1

Operations

MicroDIN Startup

Starting the Watlow MicroDIN for either one zone or several in any thermal system requires successful completion of this checklist:

• Units securely mounted (see p. 3.3, 3.4)

• Proper sensor placement (see Watlow Application Guide)

• Correct input wiring (see p. 3.5, 3.6)

• Correct communications wiring (see p. 2.2 - 2.4, 3.5, 3.8, 3.9)

• Correct fusing installed (see p. 3.10, 3.11)

• Correct limit protection installed (see p. 3.10, 3.11)

• Correct power wiring (see p. 3.5, 3.7, 3.10, 3.11)

• PC communication EIA-485 card, or PC communications card to EIA-485 converter with correct wiring (see p. 3.8)

• Communications port correctly initialized (see PC communications card document)

• MicroDIN Address set and recorded (see p. 2.7)

• MicroDIN baud rate set (see p. 2.7)

Operations

• MicroDIN-compatible software (see p. 2.9, A.2)

• MicroDIN correct order of parameter configuration (see p. 2.8 or A.19 chart)

• Record all system parameters (see p. 2.8 or A.19 chart)

6.2 Watlow MicroDIN

MicroDIN Shutdown

Shutting down a Watlow MicroDIN-controlled thermal system for an optimum restart requires attention to the following list:

• Updating all systems and controllers parameter records.

• Securing any system safety interlocks or peripherals

• Protecting the system from unnecessary exposure to moisture or corrosive environments or dust

• Anticipating the next startup and associated issues.

Watlow MicroDIN 6.3

Operations

Troubleshooting Alarms and Errors

LED

Indication Symptoms Probable Cause(s)

Power

• No power. • Power supply switch off

• Fuse blown

Error = off • Breaker tripped

• Safety interlock door switch, etc.

• Separate system limit control may be latched

• Open wiring

(Normal = • Power ≤ 20V‡ (ac/dc)

steady green)

Communications

• Unit will not communicate. • MicroDIN address DIP switch incorrectly set

• MicroDIN baud rate DIP switch incorrectly set

Error = off • MicroDIN unit-to-unit daisy chain disconnected

• Reversed, short or open EIA-485 communications wiring

• EIA-485 converter box incorrectly wired

• Computer COM port incorrectly set up

(Normal = • Communications software setup or address incorrect

pulsing green) • Protocol or parity wrong, not 8, n, 1

• Needs termination and pull-up and pull-down resistors

Input Error

• Input is in error condition. • The sensor is improperly wired

• Sensor wiring reversed, shorted or open

Error = steady red • MicroDIN firmware setting does not = actual sensor

• Power ≤ 20V‡ (ac/dc)

• Ambient environmental temperature out of spec for MicroDIN

(Normal = off) • The MicroDIN open loop detect shows a broken sensor

• The calibration offset parameter is set much too high or low

most likely problems are listed first

Alarm = • Alarm set points incorrect

steady red • Alarm silenced

Operations

(Normal = off) • Input in error condition

Flashing LED Error 4 Indicator Light Error 5 Pattern Error 6

6.4 Watlow MicroDIN

Alarms

• Alarm won’t occur. • Alarm output off

• Alarm sides incorrect

• In diagnostics mode

• Alarm won’t clear. • Alarm latched

• Alarm set points incorrect

• Alarm hysteresis incorrect

Unit Errors

•

RAM malfunction

•

EEPROM data corrupted

•

PROM malfunction

•

Error 7

Error 11

Error 12

Error 13

Error 14

Error 15

Logic hardware problem

•

New firmware installed

•

Calibration data corrupted

•

Analog-to-digital hardware failure

•

EEPROM hardware problem

•

New unit first power up

Corrective Action Reference

• Check switches, fuses, breakers, interlocks, limits, connectors, • See Watlow Publication etc. for energized condition and proper connection #COR-AG-76, “Putting it

All Together.”

• Measure power upstream for required level •

• Check wire size

• Check for bad connections

• Check and reset unit DIP switches 1-6 to correct address

• Check and reset unit DIP switch 8 to correct baud rate

• Look for a break in the daisy chain

• Verify correct connections and test wiring paths

• Check converter box wiring and its documentation

• Reconfigure computer's COM port setup and verify communications ok

• Check the communication card documentation for setable variables, operational testing

• Restart COMS software, check for settings agreement. Verify COM bus active

• Check sensor connections

• Check sensor connections and sensor wiring

• Change the Sensor Type parameter (Input Group) to match the sensor hardware

• Measure power upstream for required level

• Verify that the temperature surrounding unit is 32° to 149°F (0° to 65°C)

• Check sensor function. The Open Loop Detect parameter (Error Group) indicates it may be broken

• Check the Calibration Offset parameter (Input Group) value; set it to a lower level •

• Send the alarming MicroDIN unit a “clear alarm” signal (Modbus™: 331) • Note: The condition causing the alarm must also be resolved for the alarm to clear •

• To clear the alarm, correct the alarm condition; check to see if the alarm is latched • See p. 5.18

• Check the alarm sides setting • See p. 5.20

• Check the alarm type setting • See p. 5.19

• Check the alarm logic for compatibility with system peripherals and annunciators • See p. 5.21

• Check the power limit setting • See p. 5.9

• Check the operation mode • See p. 5.18

• Check the alarm output function • See p. 5.19

• Check °F/°C setting • See p. 5.3

• Check the calibration offset value; set it to a lower level • See p. 5.6

See p. 3.7, 3.10, 3.11, A.14

• See p. 2.7

• See p. 3.8

• See COM port information

• See COM baud

• See software document

• See p. 3.5, 3.6, 3.7

• See p. 5.5

• See p. 3.7, 3.10, 3.11, A.14

• See p. A.14

• See p. 5.22

See p. 5.6

See p. 5.17 See p. 5.18, 5.19

information

Operations

• Return unit to factory • See back cover

• Cycle power to unit • See p. 3.10 - 3.11

• Return unit to factory • See back cover

• Cycle power to unit • See p. 3.10 - 3.11

• Recalibrate unit • See p. 6.6

• Return unit to factory • See back cover

Watlow MicroDIN 6.5

Calibrating MicroDIN

Note: For information on writing Modbus™ RTU communications software for MicroDIN, see the Appendix.

To enter the calibration mode, first enter the diagnostics mode; send value 1789 to register

1512. Once in Diagnostics mode, to enter calibration mode, send 1415 to register 1600.

To restore factory calibrations settings, send value 1 to register 1601.

Thermocouple Input Procedure

Equipment Required

• Type J reference compensator with reference junction at 32°F/ 0°C, or type J thermocouple calibrator set at 32°F / 0°C.

• Precision millivolt source, 0-50mV minimum range,

0.002mV resolution.

Setup and calibration

1) Connect voltage to MicroDIN Terminals 9, 10.

10123456789

24V‡ (ac/dc)

2) Connect the millivolt source to Terminal #1 (+) and Terminal #2 (-) on the MicroDIN with copper wire.

10123456789

RTD Input Procedure

Equipment Required

• 1KΩ precision decade box with 0.01Ω resolution

• Precision current source, 0-4mA range with

0.01mA resolution

Setup and calibration

1) Connect voltage to terminals #9, #10.

10123456789

24V‡ (ac/dc)

Short terminals 1, 2 and 3 together with less than 0.1Ω.

• Send register 1603 value 4 to store ground input.

Short terminals 1 and 3 together with less than 0.5Ω.

• Send register 1603 value 5 to store RTD lead resistance.

4) Connect the decade box to terminals #1, #2 and #3 on the MicroDIN. Use 20 to 24 gauge copper wire.

10123456789

3) Enter 0.000mV from the millivolt source to the MicroDIN. Allow at least 10 seconds to stabilize.

• Send value 1 to register 1603 to store 0.000mV input.

4) Enter 50.000mV from the millivolt source to the MicroDIN. Allow at least 10 seconds to stabilize.

Operations

• Send value 2 to register 1603 to store 50.000mV input.

5) Disconnect the millivolt source and connect the reference compensator or T/C calibrator to terminal #1 (+) and Terminal #2 (-).With Type J t/c wire, if using a compensator, turn it on and short the input wires. When using a Type J calibrator, set it to simulate 32°F / 0°C. Allow 10 seconds for the control to stabilize.

• Send register 1603 value 3 to store CJC input (32°F, type J, compensated).

6) Rewire for operation and verify calibration.

6.6 Watlow MicroDIN

General Radio Model #1433-T

Ω

5) Enter 15.00Ω from the decade box to the MicroDIN. Allow at least 10 seconds to stabilize.

• Send value 6 to register 1603 to store 15.00Ω.

6) Enter 380.00Ω from the decade box to the MicroDIN. Allow at least 10 seconds to stabilize.

• Send register 1603 value 7 to store 380.00Ω.

7) Disconnect the decade box, and connect the current source to Terminals #2 (-) and #3 (+).

Enter 4.00mA from the current source to the MicroDIN. Allow at least 10 seconds to stabilize.

• Send value 10 to register 1603 to store 4mA input.

9) Rewire for operation and verify calibration.

Appendix

Modbus™RTU ............................................. A.2

Glossary ...................................................... A.8

Declaration of Conformity ....................... A.12

Specifications ............................................ A.13

Ordering Information .............................. A.15

Index ......................................................... A.16

Parameter Index ...................................... A.18

Required Parameter Setup Order ........... A.19

Warranty Information .................. Back Cover

Watlow MicroDIN A.1

Appendix

Modbus Remote Terminal Unit (RTU)

Modbus RTU enables a computer or PLC to read and write directly to registers containing the controller’s parameters. With it you could read all 141 of the controller’s parameters with five read commands.

Because of the wide array of choices available for setting up a MicroDIN controller, only a subset of the prompts contain parameters in a given situation. This manual explains the interrelations between prompts. AModbus read command response of -32000 indicates that a register is not implemented;

-32001, register not active; or -32002, not read accessible. Awrite command will return an exception response of 01 to indicate an illegal function, 02, illegal register; or 03, illegal data. If you try to write to an inactive prompt the controller will return an illegal data address message (02).

If you already have a software application that uses Modbus, you can simply skip to the Temperature/process Controller Prompt Table or the Modbus RTU Address Table in this chapter for the address information your program will need. The rest of this section on the Modbus provides information for writing a software application that uses Modbus.

Writing a Modbus Application

You need to code messages in eight-bit bytes, with no parity bit, one stop bit (8, n, 1). Negative parameter values must be written in twos complement format. Parameters are stored in two-byte registers accessed with read and write commands to a relative address.

Messages are sent in packets that are delimited by a pause at least as long as the time it takes to send 30 bits. To determine this time in seconds, divide 30 by your baud rate.

Because changing some parameters automatically changes or defaults other parameters, use the Complete Parameter Download Sequence table in this chapter to order write commands.

Using a controller address of 0x00 for a write command broadcasts that command to all the controllers in the network. This is a powerful feature if all the controllers on a network use all or most of the same parameters.

Appendix

A.2 Watlow MicroDIN

Packet Syntax

Each message packet begins with a one-byte controller address, from 0x01 to 0xF7. The second byte in the message packet identifies the message command: read (0x03 or 0x04); write (0x06 or 0x10); or loop back (0x08).

The next n bytes of the message packet contain register addresses and/or data. The last two bytes in the message packet contain a two-byte Cyclical

Redundancy Checksum (CRC) for error detection.

∆∆∆∆∆∆

address command registers and/or data CRC

Read Multiple Registers Command (0x03 or 0x04)

This command returns from 1 to 32 registers.

Packet sent to controller:| nn | 03 | nn nn | 00nn | nn nn |

∆∆∆∆∆∆∆∆

controller address (one byte) read command (0x03 or 0x04) starting register high byte starting register low byte number of registers high byte (0x00) number of registers low byte CRC low byte CRC high byte

Packet returned by controller: | nn | 03 | nn | nn nn …nn nn | nn nn|

∆∆ ∆∆∆∆∆∆∆

controller address (one byte) read command (0x03 or 0x04) number of bytes (one byte) first register data low byte first register data high byte

Watlow MicroDIN A.3

Appendix

Example: Read register 0 (model number) of the controller at address 1. Sent: 01 03 00 00 00 01 84 0A Received: 01 03 02 03 DC B9 2D Message: 988 (0x03DC).

Example: Read register 1 and 2 (Process 1 and 2 values) of controller at address

5. Sent: 05 03 00 01 00 02 94 4F Received: 05 03 04 00 64 00 C8 FF BA Message: 100 (0x0064) and 200 (0x00C8).

Write to a Single Register Command (0x06)

This command writes a parameter to a single register. The controller will echo back the command. An attempt to write to a read-only parameter returns an illegal data address error (0x02).

∆∆∆∆∆∆∆∆

controller address (one byte) write to a register command (0x06) register high byte register low byte data high byte data low byte CRC low byte CRC high byte

Appendix

A.4 Watlow MicroDIN

Example: Set register 7 (SPI) to 200 (0x00C8) on controller at address 9. Sent: 09 06 00 07 00 C8 38 D5 Received: 09 06 00 07 00 C8 38 D5

Write to Multiple Registers Command (0x10)

This command actually writes a parameter to only a single register. An attempt to write to a read-only parameter returns an illegal data address error (0x02).

Packet sent to controller: | nn | 10 | nnnn | 00 01 | 02 | nn nn | nn nn |

∆∆∆∆∆∆∆∆∆∆∆

controller address (one byte) write to multiple registers command (0x10) starting register high byte starting register low byte number of registers to write high byte (0x00) number of registers to write low byte (must be 0x01) number of data bytes (must be 0x02) data high byte data low byte CRC low byte CRC high byte

Packet returned by controller:| nn | 10 | nn nn | 00 01 | nn nn |

∆∆∆∆∆∆∆∆

Loop Back Command (0x08)

This command simply echoes the message. This serves as a quick way to check your wiring.

controller address (one byte) loop back command (0x08) data high byte data low byte CRC low byte CRC high byte

∆ ∆ ∆∆ ∆∆

Appendix

Watlow MicroDIN A.5

Example: Run loop back test on controller at address 40 (0x28). Sent: 28 08 55 66 77 88 31 B7 Received: 28 08 55 66 77 88 31 B7

Exception Responses

When a controller cannot process a command it returns an exception response and sets the high bit (0x80) of the command.

0x01 illegal command 0x02 illegal data address 0x03 illegal data value

Packet returned by controller: | nn | nn | nn | nn nn |

controller address (one byte) command + 0x80 exception code (0x01 or 0x02 or 0x03) CRC low byte CRC high byte

∆∆∆∆∆

Appendix

Messages with the wrong format, timing or CRC are ignored. Aread command sent to an inactive parameter returns 0x0000.

Example: Exception 01 - Command 02 is not supported. Sent: 01 02 00 01 00 02 A8 0B Received: 01 82 01 81 60

Example: Exception 02 - The parameter at register 45 (0x002D) is inactive. Sent: 01 06 00 2D 00 01 D8 C3 Received: 01 86 02 C3 A1

Example: Exception 03 - Cannot write 12,000 (0x2EE0) to register 7, out of range, illegal data value.

Sent: 01 06 00 07 2E E0 24 23 Received: 01 86 03 02 61

A.6 Watlow MicroDIN

Cyclical Redundancy Checksum (CRC) Algorithm

This C routine, calc_crc(), calculates the cyclical redundancy checksum, CRC, for a string of characters. The CRC is the result of dividing the string by 0xA001. Modbus applications calculate the packet’s CRC then append it to the packet.

#define POLYNOMIAL 0xA001; unsigned int calc_crc(unsigned char *start_of_packet, unsigned char

*end_of_packet) {

unsigned int crc; unsigned char bit_count; unsigned char *char_ptr;

/* Start at the beginning of the packet */

char_ptr = start_of_packet;

/* Initialize CRC */

crc = 0xffff;

/* Loop through the entire packet */

do{

/* Exclusive-OR the byte with the CRC */

crc ^= (unsigned int)*char_ptr;

/* Loop through all 8 data bits */

bit_count = 0; do{

/* If the LSB is 1, shift the CRC and XOR the polynomial mask with the CRC */

if(crc & 0x0001){

crc >>= 1; crc ^= POLYNOMIAL;

}

/* If the LSB is 0, shift the CRC only */

else{

crc >>= 1;

}

} while(bit_count++ < 7);

} while(char_ptr++ < end_of_packet); return(crc); }

Watlow MicroDIN A.7

Appendix

Glossary

Appendix

annunciator — Avisual display that uses pilot lights to indicate the former or existing condition of several items in a system.

burst fire — A power control method that repeatedly turns on and off full ac cycles. Also called zero-cross fire, it switches close to the zero-voltage point of the ac sine wave. Variable-time-base burst fire selectively holds or transits ac cycles to achieve the desired power level. See zero cross.

calibration offset — An adjustment to eliminate the difference between the indicated value and the actual process value.

CJC — see cold junction compensation. closed loop — A control system that uses a sensor to measure a process

variable and makes decisions based on that feedback.

cold junction — see junction, cold. cold junction compensation — Electronic means to compensate for the

effective temperature at the cold junction. default parameters — The programmed instructions that are permanently

stored in the microprocessor software.

derivative — derivative control (D) — The last term in the PID control algorithm. Action

that anticipates the rate of change of the process, and compensates to minimize overshoot and undershoot. Derivative control is an instantaneous change of the control output in the same direction as the proportional error. This is caused by a change in the process variable (PV) that decreases over the time of the derivative (TD). The TD is in units of seconds.

Deutsche Industrial Norm (DIN) — A set of technical, scientific and dimensional standards developed in Germany. Many DIN standards have worldwide recognition.

DIN — See Deutsche Industrial Norm. droop — In proportional controllers, the difference between set point and

actual value after the system stabilizes.

duty cycle — The percentage of a cycle time in which the output is on. external transmitter power supply — A dc voltage source that powers

external devices. filter, digital (DF) — Afilter that slows the response of a system when inputs

change unrealistically or too fast. Equivalent to a standard resistor-capacitor (RC) filter.

form A — A single-pole, single-throw relay that uses only the normally open (NO) and common contacts. These contacts close when the relay coil is energized. They open when power is removed from the coil.

form B — A single-pole, single-throw relay that uses only the normally closed (NC) and common contacts. These contacts open when the relay coil is energized. They close when power is removed from the coil.

form C — A single-pole, double-throw relay that uses the normally open (NO), normally closed (NC) and common contacts. The operator can choose to wire for

The rate of change in a process variable. Also known as rate. See PID.

A.8 Watlow MicroDIN

a form Aor form B contact. hysteresis — Achange in the process variable required to re-energize the

control or alarm output. Sometimes called switching differential. integral — Control action that automatically eliminates offset, or droop,

between set point and actual process temperature. See auto-reset. integral control (I) — A form of temperature control. The I of PID. See

integral. isolation — Electrical separation of sensor from high voltage circuitry. Allows

use of grounded or ungrounded sensing element.

JIS — See Joint Industrial Standards. junction, cold — Connection point between thermocouple metals and the

electronic instrument. See junction, reference. junction, reference — The junction in a thermocouple circuit held at a stable,

known temperature (cold junction). Standard reference temperature is 32°F (0°C).

Modbus™ — Adigital communications protocol owned by AEG Schneider

Automation for industrial computer networks. Modbus™ RTU — Remote Terminal Unit, an individual Modbus™-capable device

on a network. NEMA 4X — ANEMA specification for determining resistance to moisture

infiltration. This rating certifies the controller as washable and corrosion resistant.

on/off controller — A temperature controller that operates in either full on or full off modes.

open loop — A control system with no sensory feedback. output — Control signal action in response to the difference between set point

and process variable. overshoot — The amount by which a process variable exceeds the set point

before it stabilizes.

P control — Proportioning control. PD control — Proportioning control with derivative (rate) action. PDR control — Proportional derivative control with manual reset, used in fast

responding systems where the reset causes instabilities. With PDR control, an operator can enter a manual reset value that eliminates droop in the system.

PI control — Proportioning control with integral (auto-reset) action. PID — Proportional, integral, derivative. Acontrol mode with three functions:

proportional action dampens the system response, integral corrects for droop, and derivative prevents overshoot and undershoot.

proportional — Output effort proportional to the error from set point. For example, if the proportional band is 20° and the process is 10° below set point, the heat proportioned effort is 50 percent. The lower the PB value, the higher the gain.

proportional band (PB) — A range in which the proportioning function of the control is active. Expressed in units, degrees or percent of span. See PID.

Appendix

Watlow MicroDIN A.9

Appendix

proportional control — A control using only the P (proportional) value of PID control.

range — The area between two limits in which a quantity or value is measured. It is usually described in terms of lower and upper limits.

rate — Anticipatory action that is based on the rate of temperature change, and compensates to minimize overshoot and undershoot. See derivative.

rate band — A range in which the rate function of a controller is active. Expressed in multiples of the proportional band. See PID.

reference junction — see junction, reference. remote — Acontroller that receives its set point signal from another device

called the master. remote set point — A signal that indicates the set point for the process, and is

sent from another device. reset — Control action that automatically eliminates offset, or droop, between

set point and actual process temperature. Also see integral.

automatic reset — The integral function of a PI or PID temperature controller that adjusts the process temperature to the set point after the system stabilizes. The inverse of integral.

automatic power reset — A feature in latching limit controls that does not recognize power outage as a limit condition. When power is restored, the output is re-energized automatically, as long as the temperature is within limits.

manual reset — 1) A feature on a limit control that requires human intervention to return the limit to normal operation after a limit condition has occurred. 2) The adjustment of a proportional control to raise the proportional band to compensate for droop.

resistance temperature detector (RTD) — A sensor that uses the resistance temperature characteristic to measure temperature. There are two basic types of RTDs: the wire RTD, which is usually made of platinum, and the thermistor, which is made of a semiconductor material. The wire RTD is a positive temperature coefficient sensor only, while the thermistor can have either a negative or positive temperature coefficient.

RTD — See resistance temperature detector. thermal system — A regulated environment that consists of a heat source,

heat transfer medium or load, sensing device and a control instrument. thermocouple (t/c) — A temperature sensing device made by joining two

dissimilar metals. This junction produces an electrical voltage in proportion to the difference in temperature between the hot junction (sensing junction) and the lead wire connection to the instrument (cold junction).

thermocouple break protection — The ability of a control to detect a break in the thermocouple circuit and take a predetermined action.

three-mode control — Proportioning control with integral (reset) and derivative (rate). Also see PID.

time proportioning control — A method of controlling power by varying the on/off duty cycle of an output. This variance is proportional to the difference between the set point and the actual process temperature.

A.10 Watlow MicroDIN

transmitter — A device that transmits temperature data from either a thermocouple or a resistance temperature detector (RTD) by way of a two-wire loop. The loop has an external power supply. The transmitter acts as a variable resistor with respect to its input signal. Transmitters are desirable when long lead or extension wires produce unacceptable signal degradation.

WatLink— A Watlow software application for configuring and communication with Watlow controllers via a EIA-485 network and a Microsoft Windowscompatible personal computer.

zero cross — Action that provides output switching only at or near the zerovoltage crossing points of the ac sine wave. See burst fire.

zero switching — See zero cross.

Watlow MicroDIN A.11

Appendix

Declaration of Conformity

A.12 Watlow MicroDIN

WATLOW CONTROLS

1241 Bundy Boulevard Winona, Minnesota 55987 USA

Declares that the following product:

Rated Power Consumption: 5VA maximum Meets the essential requirements of the following European Union Directive(s) using the relevant section(s) of the normalized standards and related documents shown:

EN 50082-2: 1995 EMC Generic immunity standard, Part 2: Industrial

EN 61000-4-2: 1995 Electrostatic discharge EN 61000-4-4: 1995 Electical fast transients ENV 50140: 1994 Radiated immunity ENV 50141: 1994 Conducted immunity ENV 50204: 1995 Cellular phone

EN 50081-2: 1994 EMC Generic emission standard, Part 2: Industrial

EN 55011: 1991 Limits and methods of measurement of radio disturbance

EN 61010-1: 1993 Safety requirements for electrical equipment for

Déclare que le produit suivant :

Désignation : Série MicroDIN

Numéro(s) de modèle(s) : UD 1 A - 1CES - (quatre chiffres ou lettres

Classification : Commande, installation catégorie II, degré de

Tension nominale : 24 à 28 V ‡ (c.a./c.c.)

Fréquence nominale : 50/60 Hz

Consommation

d’alimentation nominale : 5 VA maximum Conforme aux exigences de la (ou des) directive(s) suivante(s) de l’Union Européenne figurant aux sections correspondantes des normes et documents associés ci-dessous :

EN 50082-2 : 1995 Norme générique d’insensibilité électromagnétique,

EN 50081-2 : 1994 Norme générique sur les émissions

EN 55011 : 1991 Limites et méthodes de mesure des caractéristiques

EN 61010-1 : 1993 Exigences de sécurité pour le matériel électrique

Series MicroDIN

English

89/336/EEC Electromagnetic Compatibility Directive

environment

characteristics of industrial, scientific and medical radiofrequency equipment (Class A)

73/23/EEC Low-Voltage Directive

measurement, control, and laboratory use, Part 1: General requirements

Français

quelconques)

pollution II

89/336/EEC Directive de compatibilité électromagnétique

Partie 2 : Environnement industriel

électromagnétiques, Partie 2 : Environnement industriel

d’interférences du matériel radiofréquence industriel, scientifique et médical (Classe A)

73/23/EEC Directive liée aux basses tensions

de mesure, de commande et de laboratoire, Partie 1 : Exigences générales

Erklärt, daß das folgende Produkt:

Beschreibung: Serie MicroDIN Modellnummer(n): UD 1 A - 1 CES - (4 beliebige Zahlen oder

Klassifikation: Regelsystem, Installationskategorie II,

Nennspannung: 24 bis 28 V‡ (ac/dc) Nennfrequenz: 50/60 Hz

Nominaler Stromverbrauch: Max. 5 VA Erfüllt die wichtigsten Normen der folgenden Anweisung(en) der Europäischen Union unter Verwendung des wichtigsten Abschnitts bzw. der wichtigsten

Abschnitte der normalisierten Spezifikationen und der untenstehenden einschlägigen Dokumente:

Buchstaben)

Emissionsgrad II

Deutsch

89/336/EEC EWG Elektromagnetische Verträglichkeit

EN 50082-2: 1995 EMC-Rahmennorm für Störsicherheit, Teil 2:

EN 61000-4-2: 1995 Elektrostatische Entladung EN 61000-4-4: 1995 Elektrische schnelle Stöße ENV 50140: 1994 Strahlungsimmunität ENV 50141: 1994 Leitungsimmunität ENV 50204: 1995 Mobiltelefon

EN 50081-2: 1994 EMC-Rahmennorm für Emissionen, Teil 2: Industrielle

EN 55011: 1991 Beschränkungen und Methoden der Messung von

Industrielle Umwelt

Umwelt

Funkstörungsmerkmalen industrieller, wissenschaftlicher und medizinischer Hochfrequenzgeräte (Klasse A)

72/23/EEC EWG Niederspannungsrichtlinie

EN 61010-1: 1993 Sicherheitsrichtlinien für Elektrogeräte zur Messung,

Declara que el producto siguiente:

Designación: Serie MicroDIN

Números de modelo: UD 1 A - 1CES - (Cualquier combinación de cuatro

Clasificación: Control, categoría de instalación II, grado de

Tensión nominal: 24 a 28V ‡ (Vca/Vcc)

Frecuencia nominal: 50/60 Hz

Consumo nominal

de energía: 5 VA máximo Cumple con los requisitos esenciales de las siguientes directivas de la Unión Europea, usando las secciones pertinentes de las reglas normalizadas y los documentos relacionados que se muestran:

zur Steuerung und im Labor, Teil 1: Allgemeine Richtlinien

Español

números y letras)

contaminación ambiental II

89/336/EEC Directiva de compatibilidad electromagnética

EN 50082-2: 1995 Norma de inmunidad genérica del EMC, parte 2: Ambiente

EN 50081-2: 1994 Norma de emisión genérica del EMC, parte 2: Ambiente

EN 55011: 1991 Límites y métodos de medición de características de

industrial

perturbaciones de radio correspondientes a equipos de radiofrecuencia industriales, científicos y médicos (Clase A)

73/23/EEC Directiva de baja tensión

EN 61010-1: 1993 Requerimientos de seguridad para equipos eléctricos

Erwin D. Lowell Winona, Minnesota, USA Name of Authorized Representative Place of Issue

General Manager February 1, 1997 Title of Authorized Representative Date of Issue

________________________________________ Signature of Authorized Representative

de medición, control y uso en laboratorios, Parte 1: Requerimientos generales

(1043)

Specifications:

W0UD-XSPN Rev A01

Control Mode

• Microprocessor-based, user selectable control modes

• Single input, single output

• Heat or cool auto-tuning

Output #1: User selectable

• ON/OFF; P, PI, PD, PID heat or cool action adjustable switching differential: 1 to 9999 or 0.1 to 999.9°F or °C

• Proportional band: 0 to 9999, or 0.0 to 999.9°F or °C

• Integral: 0.00 to 99.99 minutes per repeat

• Reset: 0.00 to 99.99 repeats per minute

• Derivative/Rate: 0.00 to 9.99 minutes

• Cycle Time: 0.1 to 60.0 seconds

Output #2: User selectable

• Process or deviation alarm with flashing alarm status indicator

• Alarm with separate high and low set points

• Hysteresis: 1 to 9999° switching differential

Operator Interface

• EIA-485 serial communications with Modbus™RTU protocol

• 9600, 19200 user selectable baud rates

• 1 to 63 user selectable address range

Sensor Input

• Sensor input sampling rate: 10 samples/second, 10Hz

• Thermocouple, grounded or ungrounded sensors

• RTD 2 or 3 wire, platinum, 100Ω@ 0°C calibration to JIS curve (0.003916Ω/Ω/°C), or DIN curve (0.00385Ω/Ω/°C)

• Sensor break protection de-energizes control output to protect system or selectable bumpless transfer to manual operation.

• °F or °C, user selectable

• Sensor Ranges: Accuracy Ranges: Operating Ranges

B t/c 1598 to 3092°F 870 to 1700°C 32 to 3300°F 0 to 1816°C C (W5) t/c 32 to 4200°F 0 to 2315°C 32 to 4200°F 0 to 2315°C D (W3) t/c 32 to 4200°F 0 to 2315°C 32 to 4200°F 0 to 2315°C E t/c -328 to 1472°F -200 to 800°C -328 to 1470°F -200 to 800°C J t/c 32 to 1382°F 0 to 750°C 32 to 1500°F 0 to 815°C K t/c -328 to 2282°F -200 to 1250°C -328° to 2500°F -200 to 1370°C N t/c 32 to 2282°F 0 to 1250°C 32 to 2372°F 0 to 1300°C PT2 t/c 32 to 2540°F 0 to 1393°C 32 to 2543°F 0 to 1395°C R t/c 32 to 2642°F 0 to 1450°C 32 to 3200°F 0 to 1760°C S t/c 32 to 2642°F 0 to 1450°C 32 to 3200°F 0 to 1760°C T t/c -328 to 662°F -200 to 350°C -328 to 750°F -200 to 400°C

1.0 RTD (DIN) -328 to 1202°F -200 to 650°C -328 to 1472°F -200 to 800°C

0.1 RTD (JIS) -199.9 to 999.9°F -143 to 636°C -328 to 1166°F -200 to 630°C

• Tenth degree resolution selectable over sensor operating range within limits of

-199.9 to 999.9, except for thermocouple types B, R, and S

Watlow MicroDIN A.13

Appendix

Primary Control Output (heating or cooling)

• Output update rate: 10 per second, 10Hz (maximum)

Internal Load Switching (nominal):

Switched dc (isolated) signal, 22 to 28VÎ (Vdc), current limited @ 30mA Overload current and short circuit protection

External Load Switching (maximum):

• Open Collector 60VÎ(Vdc) @ 1A

Alarm Output

• Output update rate 2 per second (2Hz)

• Electromechanical relay, Form A, 2A@ 30VÎ (Vdc) or 240VÅ(Vac),

• Alarm output can be latching or non-latching, and process or deviation with separate high and low values. Alarm silencing (inhibit) on power-up.

Accuracy

• Calibration accuracy and sensor conformity: ±0.1% of span ±1 @ 77°F ±5°F (25°C ±3°C) ambient, and rated line voltage ±10% with the following exceptions: Type T; 0.12% of span for -200°C to -50°C Types R and S; 0.15% of span for 0°C to 100°C Type B; 0.24% of span for 870°C to 1700°C

• Accuracy span: Less than or equal to operating ranges, 1000°F/540°C minimum.

• Temperature stability: ±0.2°F/°F (±0.2°C/°C) rise in ambient maximum for thermocouples, ±0.05°F/°F (±0.05°C/°C) rise in ambient maximum for RTD sensors

• Voltage stability: ±0.01% of span per percent of rated line voltage

Safety Agency Approvals

• UL/C-UL 508, File # E102269 Industrial Control Equipment

• CE to EN 61010 (pending)

Appendix

Electromagnetic Compatibility and Immunity

• Complies with EN 50081, EN 50082

Terminals

• Touch-safe set screw type, accepts 26 to 14 gauge wire

Power

• 24-28V‡(Vac/Vdc), -15%, +10% [20.4 to 30.8V‡(Vac/Vdc)]; 50/60Hz ±5% for VÅ(Vac)

• 5VA typical power consumption

• Data retention upon power failure via nonvolatile memory

• Sensor input isolation to switched dc output and communication circuitry 500VÅ(Vac) dielectric

Operating Environment

• 32 to 149°F (0 to 65°C)

• 0 to 90% RH, non-condensing

• Storage temperature: -40 to 158°F (-40 to 70°C)

Dimensions

• Width x Height x Depth

1.64" x 4.65" x 5.19" DIN rail mount (42mm x 118mm x 132mm)

1.64" x 4.65" x 5.06" Chassis mount (42mm x 118mm 129mm)

• Mounts on DIN rail per DIN EN 50022 (35mm x 7.5mm)

UL®is a registered trademark of Underwriters Laboratories. Modbus™is a registered trademark of AEG Schneider Automation. Adobe®and Acrobat®are registered trademarks of Adobe Systems Incorporated.

These specifications are subject to change without prior notice.

A.14 Watlow MicroDIN

Watlow MICRODIN User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual