Watlow MICRODIN User Manual

MICRODIN

User’s Manual

97

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: [phone], Fax: [phone]

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

January 1997 $10

A

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

97

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

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

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.

ç

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.

Ó

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 [phone].

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: [phone], Fax: [phone]. The
MicroDIN User’s Manual is copyrighted by Watlow Winona, Inc., © December
1996, with all rights reserved.

Watlow MicroDIN iii

TC

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

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

1

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

MicroDIN

MicroDIN

Temperature Controller

Temperature Controller

Power

Comms

Control
Output

Alarm

Input
Error

Address

1 2 3 4

MicroDIN

Temperature Controller

Temperature Controller

Power

Comms

Control
Output

Alarm

Input
Error

Address

MicroDIN

MicroDIN

Temperature Controller

Temperature Controller

Power

Comms

Control
Output

Alarm

Input
Error

Address

MicroDIN

MicroDIN

Temperature Controller

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

2

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: [phone]; Fax: [phone]; 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: [phone]; Fax: [phone]
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

➝

ç

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

3

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

MicroDIN

Temperature Controller

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)

ç

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

MicroDIN

MicroDIN

Temperature Controller

Temperature Controller

Power

Comms

Control
Output

Alarm

Input
Error

Address

MicroDIN

Temperature Controller

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

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

Ó

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.

ç

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

S1

S2

S3

Output and Power Wiring

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

Ó

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.

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

L1

24V‡ (ac/dc)

-+

L2

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

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

A

B

A

B

G

9VDC

G

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)

Ó

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.

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

Ó

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.

L1

120VÅ (ac)

L2
Earth Ground

Temperature

UD1A-CES-0000

EIA485 to RS232

EIA485

Loop

Watlow

MicroDIN

Controller

21 345678910

Converter

1A

0830-0474-0000

Power Supply

PC

OR

20A

17-8020

ModBus

Converter

Branch
Circuit Fuse

High Limit

Mechanical

Contactor

Semiconductor
Fuse

DA1C-1624-C000

T1

Thermocouples

Coil

DIN-a-mite

Heater

T2

R

1A

L2L1

92A3-1DJ1-DC

High
temp.

5A

light

21 3456789

Limit Control

1110 121314151617

Optional
Normally

Open

Momentary

Switch

ç

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.

3.10 Watlow MicroDIN