Rockwell Automation 1790P-T4T0 User Manual
CompactBlock LDX
I/O Thermocouple
Modules
1790D-T4T0, 1790D-4T0, 1790P-T4T0
User Manual
Important User Information
Because of the variety of uses for the products described in this
publication, those responsible for the application and use of these
products must satisfy themselves that all necessary steps have been
taken to assure that each application and use meets all performance
and safety requirements, including any applicable laws, regulations,
codes and standards. In no event will Rockwell Automation be
responsible or liable for indirect or consequential damage resulting
from the use or application of these products.
Any illustrations, charts, sample programs, and layout examples
shown in this publication are intended solely for purposes of
example. Since there are many variables and requirements associated
with any particular installation, Rockwell Automation does not
assume responsibility or liability (to include intellectual property
liability) for actual use based upon the examples shown in this
publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the
Application, Installation and Maintenance of Solid-State Control
(available from your local Allen-Bradley office), describes some
important differences between solid-state equipment and
electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in
whole or part, without written permission of Rockwell Automation, is
prohibited.
Throughout this publication, notes may be used to make you aware
of safety considerations. The following annotations and their
accompanying statements help you to identify a potential hazard,
avoid a potential hazard, and recognize the consequences of a
potential hazard:
WARNING
!
ATTENTION
Identifies information about practices or
circumstances that can cause an explosion in a
hazardous environment, which may lead to personal
injury or death, property damage, or economic loss.
Identifies information about practices or
circumstances that can lead to personal injury or
death, property damage, or economic loss.
!
IMPORTANT
Identifies information that is critical for successful
application and understanding of the product.
Rockwell Automation Support
Before you contact Rockwell Automation for technical assistance, we
suggest you please review the troubleshooting information contained
in this publication first.
If the problem persists, call your local Rockwell Automation
representative or contact Rockwell Automation in one of the following
ways:
Phone United
States/Canada
Outside United
States/Canada
Internet
If you need to contact Rockwell Automation for assistance, please
have the following information available when you call:
• a clear statement of the problem, including a description of what
the system is actually doing. Note the LED state; also note input
and output image words for the module.
• a list of remedies you have already tried
• processor type and firmware number (See the label on the
processor)
⇒
1.440.646.5800
You can access the phone number for your
country via the Internet:
1. Go to http://www.ab.com
2. Click on Product Support
(http://support.automation.rockwell.com)
3. Under Support Centers, click on Contact
Information
1. Go to http://www.ab.com
2. Click on Product Support
(http://support.automation.rockwell.com)
• hardware types in the system, including all I/O modules
• fault code if the processor is faulted
Your Questions or Comments on this Manual
If you find a problem with this manual, please notify us of it on the
enclosed How Are We Doing form.
Overview
Installation and Wiring
Table of Contents
Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . iii
Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . iv
Your Questions or Comments on this Manual . . . . . . . . . iv
Chapter 1
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Thermocouple/mV Inputs and Ranges . . . . . . . . . . . . . 1-2
Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
General Diagnostic Features . . . . . . . . . . . . . . . . . . . . . 1-4
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Module Operation - DeviceNet Example . . . . . . . . . . . . 1-5
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Chapter 2
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1790D-4T0/T4T0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
1790P-T4T0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Hazardous Location Considerations . . . . . . . . . . . . . . . 2-2
Selecting a Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Protecting the Circuit Board from Contamination. . . . . . 2-6
Installing CompactBlock LDX I/O. . . . . . . . . . . . . . . . . 2-6
Set the Node Address on the DeviceNet 1790D-4T0/T4T0
Base Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Set the Station Address on the 1790P-T4T0 PROFIBUS DP
Base Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Mount the Base Block . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
DIN Rail Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Connect the DeviceNet Cable to the 1790D-4T0/T4T0 Base
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Connect the PROFIBUS DP Terminal Connector to the
1790P-T4T0 Base Block . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Connect Power to the 1790P-T4T0 Block . . . . . . . . . . . 2-11
Field Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
System Wiring Guidelines. . . . . . . . . . . . . . . . . . . . . . . 2-12
Wiring the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Wiring the Terminal Blocks . . . . . . . . . . . . . . . . . . . . . 2-15
Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . 2-16
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
v Publication 1790-UM003A-EN-P - May 2002
vi
Module Data, Status, and Channel
Configuration for DeviceNet
Chapter 3
Module Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Input Image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Accessing Input Image File Data . . . . . . . . . . . . . . . . . . . . 3-1
Input Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Input Data Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Under-Range Flag Bits (S0 to S3) . . . . . . . . . . . . . . . . . 3-2
Over-Range Flag Bits (S8 to S11) . . . . . . . . . . . . . . . . . 3-3
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Filter Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Channel Step Response . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Channel Cutoff Frequency . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Effective Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . 3-11
Determining Module Update Time. . . . . . . . . . . . . . . . . . . 3-12
Calculating Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Configuring DeviceNet Thermocouple/mV Module
(1790D-4T0/T4T0). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Configure DeviceNet Thermocouple/mV Modules Using
RSNetWorx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Diagnostics and Troubleshooting
Specifications
Chapter 4
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Activating Devices When Troubleshooting . . . . . . . . . . 4-1
Stand Clear of the Equipment. . . . . . . . . . . . . . . . . . . . 4-2
Program Alteration. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Safety Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Module Operation vs. Channel Operation . . . . . . . . . . . . . 4-2
Power-up Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Module Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Network Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Over- or Under-Range Detection . . . . . . . . . . . . . . . . . 4-4
Open-Circuit Detection . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Module Error Definition Table . . . . . . . . . . . . . . . . . . . 4-5
Channel LED Indicator Operation . . . . . . . . . . . . . . . . . . . 4-5
Appendix A
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . A-1
DeviceNet Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
PROFIBUS DP Specifications . . . . . . . . . . . . . . . . . . . . . . . A-2
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Thermocouple/mV Specifications. . . . . . . . . . . . . . . . . . . . A-4
Publication 1790-UM003A-EN-P - May 2002
Two’s Complement Binary
Numbers
Thermocouple Descriptions
Using Thermocouple Junctions
vii
Appendix B
Positive Decimal Values . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Negative Decimal Values. . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Appendix C
International Temperature Scale of 1990. . . . . . . . . . . . . . . C-1
Type B Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Type E Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
Type J Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5
Type K Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7
Type N Thermocouples. . . . . . . . . . . . . . . . . . . . . . . . . . . C-9
Type R Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-11
Type S Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-12
Type T Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-14
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-17
Appendix D
Using a Grounded Junction Thermocouple . . . . . . . . . . . . D-1
Using an Ungrounded (Isolated) Junction Thermocouple . . D-2
Using an Exposed Junction Thermocouple. . . . . . . . . . . . . D-3
Module Configuration for
PROFIBUS
Appendix E
Configure PROFIBUS Thermocouple/mV Modules (1790P-T4R0)
E-1
Configure Thermocouple/mV Modules Using the SST PROFIBUS
Configuration Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1
Save the Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7
Download the Configuration . . . . . . . . . . . . . . . . . . . . . . . E-7
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-10
Glossary
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1
Index
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-1
Publication 1790-UM003A-EN-P - May 2002
viii
Publication 1790-UM003A-EN-P - May 2002
Chapter
Overview
This chapter describes the 1790D-4TO/T4TO (1790P-T4TO)
Thermocouple/mV Input module and explains how the module reads
thermocouple or millivolt analog input data. Included is:
• the module’s hardware and diagnostic features
• an overview of system and module operation
• compatibility
1
General Description
The thermocouple/mV input module supports thermocouple and millivolt
signal measurement applications that require up to four channels. It
digitally converts and stores thermocouple and/or millivolt analog data
from any combination of up to four thermocouple or millivolt analog
sensors. Each input channel is individually configurable via software for a
specific input device, and filter frequency, and provides open-circuit,
over-range and under-range detection and indication. When configured
for thermocouple inputs, the module can convert the thermocouple
readings into digital temperature readings in °C or °F. When configured
for mV inputs, the module assumes that the direct mV input signal is
linear prior to input to the module.
The data can be configured on board each module as:
engineering units x 1
The module uses a digital filter that provides high frequency noise
rejection for the input signals. The filter is programmable, allowing you
to select from seven different filter frequencies for each channel:
• 10 Hz
• 25 Hz
• 100 Hz
• 250 Hz
• 50 Hz
• 60 Hz
The module uses five input words for data and status bits. Module
configuration is stored in the module memory. The 1790D modules’
configuration is done via RSNetWorx for DeviceNet™ programming
software. See Chapter 3, Module Data, Status, and Channel Configuration
for DeviceNet , for details on module configuration. The 1790P module
configuration is explained in Appendix E.
1 Publication 1790-UM003A-EN-P
• 500 Hz
1-2 Overview
Thermocouple/mV Inputs and Ranges
The table below defines thermocouple types and their associated
full-scale temperature ranges. The second table lists the millivolt analog
input signal ranges that each channel will support.
Table 1.1 Thermocouple Analog Input Signal Types
Thermocouple
Ty pe
Temperature
Range
Scaling (Counts)
Resolution
*
Accuracy**
(0 to 55°C)
B +300 to +1800°C +3000 to +18000 0.1°C ±4.2°C
E -270 to +1000°C -2700 to +10000 0.1°C ±2.5°C
J -210 to +1200°C -2100 to +12000 0.1°C ±2.8°C
K -270 to +1370°C -2700 to +13700 0.1°C ±3.3°C
R -50 to +1768°C -500 to +17680 0.1°C ±3.6°C
S -50 to +1768°C -500 to +17680 0.1°C ±3.6°C
T -270 to 400°C -2700 to 4000 0.1 °C ±1.3°C
N -270 to 1300°C -2700 to 13000 0.1°C ±3.1°C
* Filter set for 10 Hz
** Module only
Table 1.2 mV Analog Input Signal Types
Millivolt Input Range Scaling
(Counts)
10µV
* Filter set for 10 Hz
** Module only
-76.5 to +76.5 mV -7650 to +7650
Resolution
10µV 306µV
*
Accuracy
(0 to 55°C)
**
Publication 1790-UM003A-EN-P
Overview 1-3
Hardware Features
DeviceNet Network
Connection
The thermocouple/mV module contains either a fixed terminal block or a
removable D-sub connector, which provides connections for four inputs
for any combination of thermocouple and mV input devices. Channels are
wired as differential inputs. The illustration below shows the hardware
features of the module.
Figure 1.1 1790D-4T0/T4T0 DeviceNet Module
Node Address
Switches
DIN Rail Slot
0
Module and Network
Status Indicators
Block LDX
Compact
S
T
U
P
IN
8
0
7
V
8
V
B
-8
D
90
17
R
E
W
O
P
C
-D
S
T
U
P
T
U
/8O
7
Thermocouple/mV Connections
(D-sub Connector shown)
Panel Mount
Hole
Thermoucouple/mV
Channel Indicators
43223
Figure 1.2 1790P-T4T0 PROFIBUS DP Module
DIN Rail Slot
PROFIBUS Network
Connector
Module Power Connector
(underneath module)
Node Address
Switches
Module and Network
Status Indicators
PROFIBUS
Connector
Panel Mount
Hole
Thermocouple/mV
Channel Indicators
Thermocouple/mV
Connections (Terminal block)
31341-M
Publication 1790-UM003A-EN-P
1-4 Overview
Internal to the module, Cold Junction Compensation (CJC) sensors are
attached to the terminal block to enable accurate readings from each
channel. These sensors compensate for offset voltages introduced into
the input signal as a result of the cold-junction where the thermocouple
wires are connected to the module.
General Diagnostic Features
Module, network, and channel LEDs help you identify the source of
problems that may occur during power-up or during normal channel
operation. The LEDs indicate both status and power. See Chapter 4,
Diagnostics and Troubleshooting , for details on power-up and channel
diagnostics.
System Overview
The modules communicate to the controller or network scanner via the
DeviceNet™ or PROFIBUS network. The 1790D modules also receive 24V
dc power through DeviceNet. An external 24V dc auxiliary source is
required to power the 1790P module and all thermocouple/mV channels.
System Operation
At power-up, the module performs a check of its internal circuits,
memory, and basic functions. If no faults are found during power-up
diagnostics, the module status LED is turned on (green).
Once a channel is properly configured and enabled, the module
continuously converts the thermocouple or mV input to a value within the
range selected for that channel.
Each time the module reads an input channel, it tests the data for a fault
(over- or under-range or open-circuit condition). If it detects a fault, the
module sets a unique bit in the channel status word. See Input Data File
on page 3-2. The module sends two’s compliment binary converted
thermocouple/mV data out over the network. See Appendix B for a
description of two’s compliment binary numbers.
Publication 1790-UM003A-EN-P
Input
VA2
Overview 1-5
Module Operation - DeviceNet Example
When the module recieves a differential input from an analog device, the
module’s circuitry multiplexes the input into an A/D converter. The
converter reads the signal and converts it as required for the type of input.
The module also continuously samples the CJC sensors and compensates
for temperature changes at the terminal block cold junction, between the
thermocouple wire and the input channel. See the block diagram below.
Figure 1.3 Block Diagram
VA1
Optical
Isolation
Vcc
CH0
+
A
_
B
Auxiliary
24Vdc
Power
1
2
3
Multiplexer
A-GND
VA3
VDC
Analog
Power
GND
Supply
Channels 1 through 3 same as
channel 0 above.
VA1
VA2
VA3
A-GND
AIN+1
A/D
AIN-
VREFVref
Channel Select
MicroController
GND
Vcc
GND
Transmit
Receive
Transceiver
Power
Supply
Network
DeviceNet
24Vdc
Power
43309
Each channel can receive input signals from a thermocouple or millivolt
analog input device, depending upon how you configured the channel.
When configured for thermocouple input types, the module converts the
analog input voltages into cold-junction compensated and linearized
digital temperature readings. The module uses the National Institute of
Standards and Technology (NIST) ITS-90 standard for linearization for all
thermocouple types (J, K, T, E, R, S, B, N).
When configured for millivolt inputs, the module converts the analog
values directly into digital counts.
Publication 1790-UM003A-EN-P
1-6 Overview
From the readings taken by the converter, the module sends
thermocouple or mV data through the microcontroller to the DeviceNet
network.
The PROFIBUS block diagram is similar.
Chapter Summary
In this chapter, you learned about the 1790D-4T0/T4T0 (1790P-T4T0)
thermocouple/mV module. See Chapter 2 to learn how to install and wire
the module.
Publication 1790-UM003A-EN-P
Installation and Wiring
Chapter
2
Before You Begin
Power Requirements
This chapter tells you how to:
• determine the power requirements for the modules
• avoid electrostatic damage
• install the module
• wire the module’s terminal block
1790D-4T0/T4T0
The module receives system power from the DeviceNet network. An
auxiliary field supply provides power for the thermocouple/mV
channels.
Table 2.1 1790D-4T0/T4T0 Power Specifications
Power Specification
DeviceNet Supply voltage - 24V dc nominal
Voltage range - 11-28.8V dc
Power dissipation - 1.2W maximum @ 28.8V dc
Field Supply voltage - 24V dc nominal
Voltage range - 21.6-26.4V dc (+
Power dissipation - 1.5W maximum @ 26.4V dc
10%)
1790P-T4T0
The module requires external supplies for both system power and for
the thermocouple/mV channels.
Table 2.2 1790P-T4T0 Power Specifications
Power Specification
PROFIBUS Supply voltage - 24V dc nominal
Voltage range - 19.2-28.8V dc
Power dissipation - 2W maximum @ 28.8V dc
Field Supply voltage - 24V dc nominal
Voltage range - 21.6-26.4V dc (+
Power dissipation - 1.5W maximum @ 26.4V dc
1 Publication 1790-UM003A-EN-P - May 2002
10%)
2-2 Installation and Wiring
General Considerations
The modules are suitable for use in a commercial or light industrial
environment when installed in accordance with these instructions.
Specifically, this equipment is intended for use in clean, dry
environments (Pollution degree 2
Over Voltage Category II
(2)
(IEC 60664-1)
(1)
) and to circuits not exceeding
(3)
.
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B,
C, D or non-hazardous locations only. The following WARNING
statement applies to use in hazardous locations.
WARNING
!
EXPLOSION HAZARD
• Substitution of components may impair suitability
for Class I, Division 2.
• Do not replace components or disconnect
equipment unless power has been switched off or
the area is known to be non-hazardous.
• Do not connect or disconnect components unless
power has been switched off or the area is known
to be non-hazardous.
• This product must be installed in an enclosure.
• All wiring must comply with N.E.C. article 501-4(b).
Publication 1790-UM003A-EN-P - May 2002
(1)
Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that
occasionally a temporary conductivity caused by condensation shall be expected.
(2)
Over Voltage Category II is the load level section of the electrical distribution system. At this level transient
voltages are controlled and do not exceed the impulse voltage capability of the product’s insulation.
(3)
Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC)
designations.
The following information applies when operating this
equipment in hazardous locations:
Products marked “CL I, DIV 2, GP A, B, C, D” are suitable for use in
Class I Division 2 Groups A, B, C, D, Hazardous Locations and
nonhazardous locations only. Each product is supplied with
markings on the rating nameplate indicating the hazardous
location temperature code. When combining products within a
system, the most adverse temperature code (lowest “T” number)
may be used to help determine the overall temperature code of
the system. Combinations of equipment in your system are
subject to investigation by the local Authority Having Jurisdiction
at the time of installation.
Installation and Wiring 2-3
Informations sur l’utilisation de cet équipement en
environnements dangereux :
Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne conviennent qu’à
une utilisation en environnements de Classe I Division 2 Groupes A,
B, C, D dangereux et non dangereux. Chaque produit est livré avec
des marquages sur sa plaque d’identification qui indiquent le code
de température pour les environnements dangereux. Lorsque
plusieurs produits sont combinés dans un système, le code de
température le plus défavorable (code de température le plus faible)
peut être utilisé pour déterminer le code de température global du
système. Les combinaisons d’équipements dans le système sont
sujettes à inspection par les autorités locales qualifiées au moment
de l’installation.
WARNING
!
EXPLOSION HAZARD
• Do not disconnect equipment unless
power has been removed or the area
is known to be nonhazardous.
• Do not disconnect connections to this
equipment unless power has been
removed or the area is known to be
nonhazardous. Secure any external
connections that mate to this
equipment by using screws, sliding
latches, threaded connectors, or other
means provided with this product.
• Substitution of components may
impair suitability for Class I,
Division 2.
• If this product contains batteries, they
must only be changed in an area
known to be nonhazardous.
AVERTISSEMENT
!
RISQUE D’EXPLOSION
• Couper le courant ou s’assurer que
l’environnement est classé non
dangereux avant de débrancher
l'équipement.
• Couper le courant ou s'assurer que
l’environnement est classé non
dangereux avant de débrancher les
connecteurs. Fixer tous les
connecteurs externes reliés à cet
équipement à l'aide de vis, loquets
coulissants, connecteurs filetés ou
autres moyens fournis avec ce
produit.
• La substitution de composants peut
rendre cet équipement inadapté à une
utilisation en environnement de
Classe I, Division 2.
• S’assurer que l’environnement est
classé non dangereux avant de
changer les piles.
Publication 1790-UM003A-EN-P - May 2002
2-4 Installation and Wiring
ATTENTION
!
Environment and Enclosure
This equipment is intended for use in a Pollution
Degree 2 industrial environment, in overvoltage
Category II applications (as defined in IEC
publication 60664-1), at altitudes up to 2000 meters
without derating.
This equipment is considered Group 1, Class A
industrial equipment according to IEC/CISPR
Publication 11. Without appropriate precautions,
there may be potential difficulties ensuring
electromagnetic compatibility in other environments
due to conducted as well as radiated disturbance.
This equipment is supplied as "open type"
equipment. It must be mounted within an enclosure
that is suitably designed for those specific
environmental conditions that will be present and
appropriately designed to prevent personal injury
resulting from accessibility to live parts. The interior
of the enclosure must be accessible only by the use
of a tool. Subsequent sections of this publication may
contain additional information regarding specific
enclosure type ratings that are required to comply
with certain product safety certifications.
See NEMA Standards publication 250 and IEC
publication 60529, as applicable, for explanations of
the degrees of protection provided by different types
of enclosure. Also, see the appropriate sections in
this publication, as well as the Allen-Bradley
publication 1770-4.1 ("Industrial Automation Wiring
and Grounding Guidelines"), for additional
installation requirements pertaining to this
equipment.
Publication 1790-UM003A-EN-P - May 2002
Installation and Wiring 2-5
ATTENTION
!
WARNING
!
Preventing Electrostatic Discharge
This equipment is sensitive to electrostatic discharge,
which can cause internal damage and affect normal
operation. Follow these guidelines when you handle
this equipment:
• Touch a grounded object to discharge potential
static.
• Wear an approved grounding wriststrap.
• Do not touch connectors or pins on component
boards.
• Do not touch circuit components inside the
equipment.
• If available, use a static-safe workstation.
• When not in use, store the equipment in
appropriate static-safe packaging.
If you insert or remove the module while power is
on, an electrical arc can occur. This could cause an
explosion in hazardous location installations.
Be sure that power is removed or the area is
nonhazardous before proceeding.
Selecting a Location
Reducing Noise
Most applications require installation in an industrial enclosure to
reduce the effects of electrical interference. Thermocouple inputs are
highly susceptible to electrical noise. Electrical noise coupled to the
thermocouple inputs will reduce the performance (accuracy) of the
module.
Group your modules in the enclosure to minimize adverse effects
from radiated electrical noise and heat. Consider the following
conditions when selecting a location for the module. Position the
module:
• away from sources of electrical noise such as hard-contact
switches, relays, and AC motor drives
• away from modules which generate significant radiated heat.
In addition, route shielded, twisted-pair wiring away from any high
voltage I/O wiring.
Publication 1790-UM003A-EN-P - May 2002
2-6 Installation and Wiring
Protecting the Circuit Board from Contamination
The printed circuit boards of analog modules must be protected from
dirt, oil, moisture, and other airborne contaminants. To protect these
boards, the system must be installed in an enclosure suitable for the
environment. The interior of the enclosure should be kept clean and
the enclosure door should be kept closed whenever possible.
Installing CompactBlock LDX I/O
Follow these steps to install the block:
1. Set the node address on the base block.
2. Mount the base block.
3. Wire the terminal blocks.
4. Connect the network cable.
These steps are explained in detail in the following procedures for
both the 1790D-4T0/T4T0 DeviceNet and 1790P-T4T0 PROFIBUS DP
modules.
Set the Node Address on the DeviceNet 1790D-4T0/T4T0 Base
Block
Each base block comes with its internal program set for node address
63. To reset the node address, adjust the switches on the front of the
block. The two switches are most significant digit (MSD) and least
significant digit (LSD). The switches can be set between 00 and 63.
The rotary switches are read at block power up only. Switch settings
between 64 and 99 cause the block to use the last valid node address
stored internally.
Example: Node
Address is set at 26
The node address may also be set through RSNetWorx for DeviceNet
or a similar configuration tool. When software configuration is used
for the node address, the switches must be set between 64 and 99.
43230
Publication 1790-UM003A-EN-P - May 2002
Installation and Wiring 2-7
Set the Station Address on the 1790P-T4T0 PROFIBUS DP Base
Block
To set the station address, adjust the switches on the front of the base
block. The two switches are most significant digit (MSD) and least
significant digit (LSD). The switches can be set between 00 and 99.
Mounting
The rotary switches are read at base block power up only
Example: Node
Address is set at 26
43230
.
Mount the Base Block
You can mount the base block to a panel or DIN rail. We recommend
that you ground the panel or DIN rail before mounting the block.
IMPORTANT
WARNING
!
The RTD and thermocouple base modules
do not support any expansion blocks.
When used in a Class I, Division 2,
hazardous location, this equipment must
be mounted in a suitable enclosure with
proper wiring method that complies with
the governing electrical codes.
Panel Mounting
1. Place the block against the panel where you want to mount it.
2. Gently pull and position the expansion cover to the left.
3. Place a center punch, nail or similar device through the mounting
holes in the block and make two marks on the panel (lower left
and upper right corners of the module).
4. Remove the block and drill two holes in the panel to
accommodate each of the mounting screws.
Publication 1790-UM003A-EN-P - May 2002
2-8 Installation and Wiring
5. Replace the block on the panel and place a screw through each of
the two mounting holes. Tighten the screws until the block is
firmly in place
41 mm
1.6 in
.
95 mm
3.74 in
X
LD
ck
lo
CompactB
EXPANSION UNIT
0
0
7
1790-16BVOX
16 INPUTS-DCPOWER
7
Expansion
Cover
43242
DIN Rail Mounting
1. Hook the top slot of the block over the DIN Rail.
2. Pull down on the locking lever while pressing the block against
the rail
.
f
Locking Lever
43243
3. Push up on the locking lever to secure the block to the rail when
the block is flush against the rail.
Publication 1790-UM003A-EN-P - May 2002
Installation and Wiring 2-9
Connect the DeviceNet Cable to the 1790D-4T0/T4T0 Base Block
Follow these procedures when connecting the DeviceNet cable to the
base block.
The required DeviceNet connector is not supplied with the block you must purchase it separately. There are three types of connectors
that you can order directly from Rockwell Automation or your local
distributor:
• 1799-DNETCON - 5-position open style connector
• 1799-DNETSCON - 5-position open style connector with locking
screws
• 1799-DNC5MMS - 5-position open style to 5-pin micro male
connector with locking screws
WARNING
If you connect or disconnect the DeviceNet cable
with power applied to this module or any device
on the network, an electrical arc can occur. This
could cause an explosion in hazardous location
!
installations.
Be sure that power is removed or the area is
nonhazardous before proceeding.
Connect the DeviceNet wiring (drop line) to one of the DeviceNet
connectors as shown below. A color-coded wiring diagram is also
printed next to the connector on the left side of the module
Block LDX
Compact
Wiring Diagram for
1799-DNETCON
1790D-8BV8V
8 INPUTS/8OUTPUTS-DC POWER
0
0
7
7
V+ Red
Can_H White
Drain/Shield
Can_L Blue
V- Black
V+ Red
V- Black
Wiring Diagram for
1799-DNC5MMS
Drain/Shield
Can_H White
Can_L Blue
43245
Publication 1790-UM003A-EN-P - May 2002
2-10 Installation and Wiring
Connect the PROFIBUS DP Terminal Connector to the 1790P-T4T0
Base Block
Follow these procedures to connect the PROFIBUS DP terminal
connector to the base block.
WARNING
!
The required PROFIBUS female 9-pin D-sub connector is not
supplied with the base block - you must purchase it separately.
Before you connect female 9-pin D-sub connector to the base block,
make sure it is wired correctly as shown in the following table.
Table 2.3 Wiring Descriptions for 9-Pin D-Sub Connector
Pin Number Name Description
1 shield Shield, Protective Ground
2 M24V Minus 24V Output Voltage
3 RxD/TxD-P Receive/Transmit-Data-P
If you connect or disconnect the PROFIBUS cable
with power applied to this module or any device on
the network, an electrical arc can occur. This could
cause an explosion in hazardous location
installations.
Be sure that power is removed or the area is
nonhazardous before proceeding.
Publication 1790-UM003A-EN-P - May 2002
4 CNTR-P Control-p
5 DGND Data Ground
6 VP Voltage-Plus
7 P24V Plus 24V Output Voltage
8 RxD/TxD-N Receive/Transmit-Data-N
9 CNTR-N Control-N
Module Power Connector
(underneath module)
Installation and Wiring 2-11
Once you have properly wired the connector, attach it to the base
block as shown below. Use the locking screws on the connector to
fasten it to the base block.
PROFIBUS Connector
Green - GND
Black - COM
Red - +24V dc
43249
Connect Power to the 1790P-T4T0 Block
To apply power to the block, refer to the above illustration.
Publication 1790-UM003A-EN-P - May 2002
2-12 Installation and Wiring
Field Wiring Connections
System Wiring Guidelines
Consider the following when wiring your system:
General
• Route field wiring away from any other wiring and as far as
possible from sources of electrical noise, such as motors,
transformers, contactors, and ac devices. As a general rule, allow
at least 15.2 cm
(6 in.) of separation for every 120V of power.
• Routing field wiring in a grounded conduit can reduce electrical
noise.
• If field wiring must cross ac or power cables, ensure that they
cross at right angles.
• If multiple power supplies are used with analog millivolt inputs,
the power supply commons must be connected.
Terminal Block
• Do not use the module’s NC terminals as connection points.
• For millivolt sensors, use Belden 8761 shielded, twisted-pair wire
(or equivalent) to ensure proper operation and high immunity to
electrical noise.
• For a thermocouple, use the shielded, twisted-pair thermocouple
extension lead wires specified by the thermocouple manufacturer.
Using the incorrect type of thermocouple extension wire or not
following the correct polarity will cause invalid readings.
• To ensures optimum accuracy, limit overall cable impedance by
keeping a cable as short as possible. Locate the module as close to
input devices as the application permits.
Publication 1790-UM003A-EN-P - May 2002
Grounding
Installation and Wiring 2-13
ATTENTION
!
• This product is intended to be mounted to a well-grounded
mounting surface such as a metal panel. Additional grounding
connections from the module’s mounting tabs or DIN rail (if used)
are not required unless the mounting surface cannot be grounded.
• Keep cable shield connections to ground as short as possible.
• Ground the shield drain wire at one end only. The typical location
is as follows.
– For grounded thermocouples or millivolt sensors, this is at the
sensor end.
– For insulated/ungrounded thermocouples, this is at the
module end. Contact your sensor manufacturer for additional
details.
The possibility exists that a grounded or exposed
thermocouple can become shorted to a potential
greater than that of the thermocouple itself. Due to
possible shock hazard, take care when wiring
grounded or exposed thermocouples. See Appendix
D, Using Thermocouple Junctions.
• If it is necessary to connect the shield drain wire at the module
end, connect it to earth ground using a panel or DIN rail mounting
screw.
• Refer to Industrial Automation Wiring and Grounding Guidelines,
Allen-Bradley publication 1770-4.1, for additional information.
Noise Prevention
• To limit the pickup of electrical noise, keep thermocouple and
millivolt signal wires as far as possible from power and load lines.
• If noise persists for a device, try grounding the opposite end of
the cable shield. (You can only ground one end at a time.)
Publication 1790-UM003A-EN-P - May 2002
2-14 Installation and Wiring
Wiring the Module
ATTENTION
!
After the module is properly installed, follow the wiring procedure
below, using the proper thermocouple extension cable, or Belden
8761 for non-thermocouple applications.
signal wire
signal wire
To wire your module follow these steps.
1. At each end of the cable, strip some casing to expose the
individual wires.
2. Trim the signal wires to 2-inch (5 cm) lengths. Strip about 3/16
inch (5 mm) of insulation away to expose the end of the wire.
To prevent shock hazard, care should be taken when
wiring the module to analog signal sources. Before
wiring any module, disconnect power from the
system power supply and from any other source to
the module.
Cut foil shield
and drain wire
signal wire
drain wire
cable
foil shield
signal wire
ATTENTION
Be careful when stripping wires. Wire fragments
that fall into a module could cause damage at
power up.
!
3. At one end of the cable, twist the drain wire and foil shield
together, bend them away from the cable, and apply shrink wrap.
Then earth ground at the preferred location based on the type of
sensor you are using. See Grounding on page 2-13.
Publication 1790-UM003A-EN-P - May 2002
Installation and Wiring 2-15
4. At the other end of the cable, cut the drain wire and foil shield
back to the cable and apply shrink wrap.
5. Connect the signal wires to the terminal block. Connect the other
end of the cable to the analog input device.
6. Repeat steps 1 through 5 for each channel on the module.
TIP
See Appendix D Using Thermocouple Junctions for
additional information on wiring grounded,
ungrounded, and exposed thermocouple types.
Wiring the Terminal Blocks
The following figures show how to wire the terminal blocks.
Figure 2.1 1790D-4R0-RTD Input Module D-Shell Wiring
+24V
19
GND
+24V
18
37
+24V
36
GND
17
35
GND
NC
16
34
NC
NC
15
33
NC
NC
14
CH0_B
CH0_A
13
32
NC
31
NC
CH1_A
12
30
NC
CH1_B
11
29
NC
10
28
NC
NC
9
27
NC
NC
CH2_A
8
26
NC
CH2_B
7
25
NC
CH3_A
6
24
NC
CH3-B
5
23
NC
4
22
NC
Wire pins 17, 18, 19 to Field Power (+) 24V dc
Wire pins 35, 36, 37 to Field Power (-) GND
Figure 2.2 1790D-T4R0 and 179P-T4R0 RTD Input Module D-Shell Wiring
+24V
Wire pin 1 to Field Power (+) 24V dc
Wire pin 2 to Field Power (-) GND
CH0_A
1
2
GND
CH1_A
3
4
CH1_B
CH0-B
CH2_A
NC
5
6
CH3_A
7
9
8
10
CH2_B
NC
NC
11
13
12
CH3_B
14
NC
NC
15
16
NC
NC
17
18
NC
NC
19
20
NC
432X1
NC
NC
NC
3
21
NC
1
2
20
NC
43256
IMPORTANT
When using an ungrounded thermocouple, the shield
must be connected to ground at the module end.
Publication 1790-UM003A-EN-P - May 2002
2-16 Installation and Wiring
Cold Junction Compensation
Chapter Summary
To obtain accurate readings from each of the channels, the cold
junction temperature (temperature at the module’s terminal junction
between the thermocouple wire and the input channel) must be
compensated for. Cold junction compensating thermistors have been
integrated in the module.
In this chapter, you learned how to install and wire your modules. See
Chapter 3 to learn about module data, status, and channel
configuration with DeviceNet.
Publication 1790-UM003A-EN-P - May 2002
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