Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication SGI-1.1
available from your local Rockwell Automation sales office or online at
http://www.ab.com/manuals/gi) describes some important differences
between solid state equipment and hard-wired electromechanical devices.
Because of this difference, and also because of the wide variety of uses for
solid state equipment, all persons responsible for applying this equipment
must satisfy themselves that each intended application of this equipment is
acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for
indirect or consequential damages resulting from the use or application of
this equipment.
The examples and diagrams in this manual are included solely for illustrative
purposes. Because of the many variables and requirements associated with
any particular installation, Rockwell Automation, Inc. cannot assume
responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to
use of information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without
written permission of Rockwell Automation, Inc. is prohibited.
Throughout this manual we use notes to make you aware of safety
considerations.
WARNING
IMPORTANT
ATTENTION
SHOCK HAZARD
BURN HAZARD
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 that is critical for successful
application and understanding of the product.
Identifies information about practices or circumstances
that can lead to personal injury or death, property
damage, or economic loss. Attentions help you:
• identify a hazard
• avoid a hazard
• recognize the consequence
Labels may be located on or inside the drive to alert
people that dangerous voltage may be present.
Labels may be located on or inside the drive to alert
people that surfaces may be dangerous temperatures.
Summary of Changes
The information below summarizes the changes to this manual since
the last printing.
To help you find new and updated information in this release of the
manual, we have included change bars as shown to the right of this
paragraph.
For information on:See page:
Changes to the SLC™ 500 Thermocouple/mV Input Module.throughout manual
Using RSLogix™ 500 to configure the NT4 module.2-4, 5-2, 6-1, and Appendix
E
Maintaining the ambient temperature surrounding the SLC
500 above 3°C (37.4°F).
A-2
Publication 1746-UM007C-EN-P - July 2004
2 Summary of Changes
Publication 1746-UM007C-EN-P - July 2004
Overview
Quick Start for Experienced Users
Table of Contents
Preface
Who Should Use this Manual. . . . . . . . . . . . . . . . . . . . . . . P-1
(Nickel-Chromium vs. Copper-Nickel <Constantan>) . . . C-4
S and R Type Thermocouples . . . . . . . . . . . . . . . . . . . . . . C-5
S (Platinum-10% Rhodium vs. Platinum)
R (Platinum-13% Rhodium vs. Platinum) . . . . . . . . . . . C-5
Appendix D
Appendix E
Glossary
Index
Publication 1746-UM007C-EN-P - July 2004
Preface
Read this preface to familiarize yourself with the rest of the manual.
The preface includes:
• Who Should Use this Manual
• Purpose of this Manual
• Common Techniques Used in this Manual
Who Should Use this
Manual
Purpose of this Manual
Use this manual if you are responsible for designing, installing,
programming, or troubleshooting control systems that use SLC 500
4-Channel Thermocouple/mV Input Module.
You should have a basic understanding of electrical circuitry and
familiarity with relay logic. If you do not, obtain the proper training
before using this product.
This manual describes the procedures you use to install, wire, and
troubleshoot your 4-channel thermocouple/mV module. This manual:
• explains how to install and wire your module
• gives you an overview of the SLC 500 programmable controller
system
Refer to your programming software user documentation for more
information on programming your SLC 500 programmable controller.
1Publication 1746-UM007C-EN-P - July 2004
2 Preface
Related Documentation
The following documents contain additional information concerning
Rockwell Automation products. To obtain a copy, contact your local
Rockwell Automation office or distributor.
ForRead this DocumentDocument Number
In-depth information on the SLC Instruction Set.SLC 500 Instruction Set Reference Manual1747-RM001
A description on how to install and use your Modular SLC 500
programmable controller.
A description on how to install and use your Fixed SLC 500
programmable controller.
A description on how to install the SLC 500 4-Channel
Thermocouple/mV input module
Information on reducing electrical noise. System Design for Control of Electrical
In-depth information on grounding and wiring Allen-Bradley®
programmable controllers.
A description of important differences between solid-state
programmable controller products and hard-wired electromechanical
devices.
An article on wire sizes and types for grounding electrical
equipment.
A glossary of industrial automation terms and abbreviations.Allen-Bradley Industrial Automation
SLC 500 Modular Hardware Style User
Manual
Installation & Operation Manual for Fixed
Hardware Style Programmable Controllers
– contacting your local distributor or Rockwell Automation
representative
– visiting www.theautomationbookstore.com
– calling 1.800.963.9548 (USA/Canada) or 001.330.725.1574
(Outside USA/Canada)
Your Questions or Comments on this Manual
If you find a problem with this manual, or you have any suggestions
for how this manual could be made more useful to you, please
contact us at the address below:
Common Techniques Used
in this Manual
Rockwell Automation
Automation Control and Information Group
Technical Communication, Dept. A602V
P.O. Box 2086
Milwaukee, WI 53201-2086
The following conventions are used throughout this manual:
• Bulleted lists such as this one provide information, not
procedural steps.
• Numbered lists provide sequential steps or hierarchical
information.
• Italic type is used for emphasis.
Publication 1746-UM007C-EN-P - July 2004
4 Preface
Publication 1746-UM007C-EN-P - July 2004
Chapter
Overview
This chapter describes the thermocouple/millivolt module and
explains how the SLC controller gathers thermocouple or millivolt
initiated analog input from the module. This chapter includes:
• General Description
• System Overview
1
General Description
The thermocouple/mV module receives and stores digitally converted
thermocouple and/or millivolt (mV) analog data into its image table
for retrieval by all fixed and modular SLC 500 processors. The module
supports connections from any combination of up to four
thermocouple or mV analog sensors.
The following tables define thermocouple types and their associated
full scale temperature ranges and also list the millivolt analog input
signal ranges that each 1746-NT4 channel will support. To determine
the practical temperature range your thermocouple supports, refer to
the specifications in Appendix A.
Ty pe°C Temperature Range°F Temperature Range
J-210° to 760°-346° to 1400°
K-270° to 1370°-454° to 2498°
T-270° to 400°-454° to 752°
B300° to 1820°572° to 3308°
E-270° to 1000°-454° to 1832°
R0° to 1768°32° to 3214°
S0° to 1768°32° to 3214°
N0° to 1300°32° to 2372°
CJC Sensor0° to 85°32° to 185°
Millivolt Input TypeRange
±50 mV-50 mV dc to +50 mV dc
±100 mV-100 mV dc to +100 mV dc
Each input channel is individually configurable for a specific input
device and provides open-circuit, over-range, and under-range
detection and indication.
1Publication 1746-UM007C-EN-P - July 2004
1-2 Overview
Hardware Features
The thermocouple module fits into any single-slot, except the
processor slot (0), in either an SLC 500 modular system or an SLC 500
fixed system expansion chassis (1746-A2). It is a Class 1 module (uses
8 input words and 8 output words). It interfaces to thermocouple
types J, K, T, E, R, S, B, and N, and supports direct ±50 mV and ±100
mV analog input signals.
The module requires the use of Block Transfer in a remote
configuration.
The module contains a removable terminal block providing
connection for four thermocouple and/or analog input devices. There
are also two, cold-junction compensation (CJC) sensors used to
compensate for offset voltages introduced into the input signal as a
result of the cold-junction, i.e., where the thermocouple wires connect
to the module wiring terminal. There are no output channels on the
module. Module configuration is done via the user program. There are
no DIP switches.
Channel Status
LEDs (Green)
Module Status
LED (Green)
Removable
Terminal Block
CJC Sensors
Cable Tie Slots
INPUT
CHANNEL
STATUS
MODULE
ST
ATUS
THERMOCOUPLE/mV
012
3
Door Label
CJC A+
Do Not
Remove
CHL0+
_
CJC A
Do Not
Remove
CHL0
SHIELD
CHL1+
SHIELD
_
CHL1
SHIELD
CHL2+
SHIELD
_
CHL2
SHIELD
CHL3+
_
CJC B
Do Not
CHL3
Remove
CJC B+
Do Not
Remove
ANLG
COM
Side Label
CAT
SERIAL
1746 NT4
NT4-xxx x
THERMOCOUPLE/mV INPUT MODULE
SLC 500
NO.
SER
FRN
®
CLASS I, GROUPS A, B, C AND D, DIV.2
U
L
FOR HAZ. LOC. A196
LISTED IND. CONT. EQ.
_
SA
®
OPERATING
TEMPERATURE
CODE T3C
FAC 1M
THERMOCOUPLE TYPES:
VOLTAGE:
INPUT SIGNAL RANGES
100mVDC to +100mVDC
_
50mVDC to +50mVDC
_
_
J, K, T, E, R, S, B, N
MADE IN USA
Self-Locking Tabs
Publication 1746-UM007C-EN-P - July 2004
HardwareFunction
Overview 1-3
Channel Status LED
Indicators
Module Status LEDDisplays module operating and fault status
Side Label (Nameplate)Provides module information
Removable Terminal BlockProvides physical connection to input devices.
Door LabelPermits easy terminal identification
Cable Tie SlotsSecure and route wiring from module
Self-Locking TabsSecure module in chassis slot
Display operating and fault status of
channels 0, 1, 2, and 3
It is color coded green.
General Diagnostic Features
The thermocouple/mV module contains diagnostic features that can
help you identify the source of problems that may occur during
power-up or during normal channel operation. These power-up and
channel diagnostics are explained in chapter 7, Module Diagnostics and Troubleshooting.
System Overview
The thermocouple module communicates to the SLC 500 processor
through the parallel backplane interface and receives +5V dc and
+24V dc power from the SLC 500 power supply through the
backplane. No external power supply is required. You may install as
many thermocouple modules in your system as the power supply can
support.
SLC Processor
Thermocouple Modules
Publication 1746-UM007C-EN-P - July 2004
1-4 Overview
Each individual channel on the thermocouple module can receive
input signals from thermocouple sensors or mV analog input devices.
You configure each channel to accept either input. When configured
for thermocouple input types, the thermocouple module converts the
analog input voltages into cold-junction compensated and linearized,
digital temperature readings. The 1746-NT4 uses the National Bureau
of Standards (NBS) Monograph 125 and 161 based on IPTS-68 for
thermocouple linearization.
When configured for millivolt analog inputs, the module converts the
analog values directly into digital values. The module assumes that the
mV input signal is already linear.
System Operation
At power-up, the thermocouple module performs a check of its
internal circuits, memory, and basic functions. During this time the
module status LED remains off. If no faults are found during the
power-up diagnostics, the module status LED is turned on.
Thermocouple or mV
Analog Signals
Thermocouple
Input
Module
Channel Data W
Channel
Channel
Configuration W
Status W
ord
ord
SLC 500
Processor
ord
After power-up checks are complete, the thermocouple module waits
for valid channel configuration data from your SLC ladder logic
program (channel status LEDs off). After configuration data is written
to one or more channel configuration words and their channel enable
status bits are set, the channel status LEDs go on and the
thermocouple module continuously converts the thermocouple or
millivolt input to a value within the range you selected for the enabled
channels.
Each time a channel is read by the module, that data value is tested by
the module for a fault condition, i.e. open circuit, over range, and
under range. If such a condition is detected, a unique bit is set in the
channel status word and the channel status LED blinks.
The SLC processor reads the converted thermocouple or millivolt data
from the module at the end of the program scan, or when
commanded by the ladder program. The processor and thermocouple
module determine that the backplane data transfer was made without
error, and the data is used in your ladder program.
Publication 1746-UM007C-EN-P - July 2004
Overview 1-5
Module Operation
The thermocouple module input circuitry consists of four differential
analog inputs multiplexed into a single analog-to-digital (A/D)
convertor. The mux circuitry also continuously samples the CJC A and
CJC B sensors and compensates for temperature changes at the cold
junction (terminal block). The figure on the following page shows a
block diagram for the analog input circuitry.
The A/D convertor reads the selected input signal and converts it to a
digital value. The multiplexer sequentially switches each input
channel to the module’s A/D convertor. Multiplexing provides an
economical means for a single A/D convertor to convert multiple
analog signals. However, it does affect the speed at which an input
signal can change and still be detected by the convertor.
Thermocouple Compatibility
The thermocouple module is fully compatible with all SLC 500 fixed
and modular controllers. It is compatible with all NBS MN-125
standard types J, K, T, E, R, S, and B thermocouple sensors and
extension wire; and with NBS MN-161, 14AWG, standard type N
thermocouple and extension wire. Refer to Appendix C for more
details.
The Series B (or higher) 1746-NT4 differential design allows for a
maximum channel-to-channel common-mode voltage
difference/separation of 2 volts. This means that if you are using an
NT4 with multiple grounded thermocouples with metallic sheaths or
exposed thermocouples with measuring junctions that make contact
with electrically conductive material, their ground potentials must be
within 2 volts. If this is not done, your temperature readings will be
inaccurate or the module could be damaged. If your grounded
thermocouple protective sheath is made of an electrically
non-conductive material such as ceramic, then the voltage separation
specification is not as important. Refer to Appendix D for an
explanation of grounded, ungrounded, and exposed thermocouples.
Use the analog common (
ANALOG COM) terminal for applications that
have multiple grounded thermocouples. This analog common
terminal must be jumpered to either the (+) or (-) terminal of any
active channel which is connected to a grounded thermocouple. See
Wiring Considerations on page 3-8 for complete information on the
use of the
ANALOG COM terminal.
Publication 1746-UM007C-EN-P - July 2004
1-6 Overview
Input Circuit Block Diagram
Input Circuit Block Diagram
Terminal BlockModule Circuitry
+
CJCA
Sensor
Open Circuit
Detection
within
2V*
within
2V*
*See Important note below.
Channel 0
Channel
Channel
Channel
ungrounded
thermocouple
1
grounded
thermocouple
2
grounded
thermocouple
3
grounded
thermocouple
user supplied
jumper
CJCB Sensor
+
-
Shield
+
+
-
-
Shield
+
-
Shield
+
-
Shield
Analog
Common
+
-
Multiplexer
Analog to
Digital
Convertor
User-Selected
Filter Frequency
Digital
Filter
Digital
Value
Publication 1746-UM007C-EN-P - July 2004
Chassis Ground
(internally connected)
IMPORTANT
When using multiple grounded and/or exposed
thermocouples that are touching on electrically
conductive material with Series B or higher
1746-NT4, the ground potential between any two
channels cannot exceed 2 volts.
Overview 1-7
ATTENTION
The possibility exists that grounded or exposed
thermocouples can become shorted to a potential
greater than that of the thermocouple itself. Due to
possible shock hazard, care should be taken when
wiring these types of thermocouples. Refer to
Appendix D for more details.
Linear Millivolt Device Compatibility
A large number of millivolt devices may be used with the 1746-NT4
module. For this reason we do not specify compatibility with any
particular device.
However, millivolt applications often use bridges of strain gages. To
allow the NT4 Series B (or higher) to operate correctly, the analog
common (
level within 2V of the signal of interest. A resistive voltage divider
using 10k Ω resistors is recommended to accomplish this. The circuit
diagram below shows how this connection is made.
ANALOG COM) terminal of the module needs to be biased to a
NT4
INPUT
(CHL0, CHL1,
CHL2, CHL3)
ANALOG COM
Strain
Gage
Bridge
fixed
+
-
fixed
+
Vcc
variable
fixed
10k Ω
10k
Ω
Publication 1746-UM007C-EN-P - July 2004
1-8 Overview
Publication 1746-UM007C-EN-P - July 2004
Chapter
2
Quick Start for Experienced Users
This chapter can help you to get started using the NT4 4-channel
thermocouple/mV module. The procedures are based on the
assumption that you have an understanding of SLC 500 products. You
should understand electronic process control and be able to interpret
the ladder logic instructions required to generate the electronic signals
that control your application.
Because it is a start-up guide for experienced users, this chapter does not contain detailed explanations about the procedures listed. It does,
however, reference other chapters in this book where you can get
more information about applying the procedures described in each
step. It also references other documentation that may be helpful if you
are unfamiliar with programming techniques or system installation
requirements.
Required Tools and
Equipment
If you have any questions or are unfamiliar with the terms used or
concepts presented in the procedural steps, always read the referenced chapters and other recommended documentation before
trying to apply the information.
If the contents are incomplete, call your local Allen-Bradley representative for assistance.
2.Ensure your chassis supports placement of the 1746-NT4 moduleReference
Review the power requirements of your system to see that your chassis supports placement of the
thermocouple input module.
• For modular style systems, calculate the total load on the system power supply using the
procedure described in the SLC 500 Modular Hardware Style User Manual (Publication
Number 1747-UM011) or the SLC 500 Modular Chassis and Power Supplies Technical Data
(Publication Number 1746-TD003).
• The fixed, 2-slot chassis supports 2 thermocouple input modules. If combining a
thermocouple module with a different module, refer to the module compatibility table
found in chapter 3.
Chapter 3
(Installion and
Wiring
Appendix A
(Specifications)
Publication 1746-UM007C-EN-P - July 2004
Quick Start for Experienced Users 2-3
3. Insert the 1746-NT4 module into the chassisReference
Make sure system power is off; then insert the thermocouple input module into your 1746
chassis. In this example procedure, local slot 1 is selected.
ATTENTION
Never install, remove, or wire modules with power
applied to the chassis or devices wired to the
module.
T
op and Bottom
Module Release(s)
Chapter 3
(Installation and
Wiring)
Card
Guide
Publication 1746-UM007C-EN-P - July 2004
2-4 Quick Start for Experienced Users
4. Connect the thermocouple wiresReference
Connect thermocouple wires to channel 0 on the module’s terminal block. Make sure both cold
junction compensation (CJC) assemblies are securely attached.
Ground the shield drain wire at one end only. The preferred location is to the same point as the
sensor ground reference. For grounded thermocouples or mV sensors, this is at the sensor. For
insulated/ungrounded thermocouples, this is at the NT4 module.
Terminal
Block
CJC A
Assembly
SHIELD
SHIELD
CHL 0+
_
CHL
0
CHL 1+
_
CHL
1
Refer to the paragraph above
Thermocouple
Wire
Chapter 3
(Installion and
Wiring
Appendix D
(Thermocouple
Types
5. Configure the system.Reference
Configure your system I/O configuration for the particular slot the NT4 is in (slot 1 in this
example). Select the module from the drop-down list or enter the thermocouple input module ID
code (3510).
Chapter 4
(Preliminary
Operating
Considerations)
When using RSLogix 500 version 6.10 or higher, you may select Advanced Configuration, then
Configure, to use the software’s I/O wizard to configure the NT4 (see appendix E for details). If
you use this option, proceed to step 8.
Your
programming
software online
help screens
Publication 1746-UM007C-EN-P - July 2004
Quick Start for Experienced Users 2-5
6. Determine the operating parameters.Reference
Determine the operating parameters for channel 0. This example shows the channel 0
configuration word defined with all defaults (0) except for channel enable (bit 11). The
addressing reflects the location of the module as slot 1.
SLC 500 Controller
Data Files
Output Image
(8 words)
Channel 0 Configuration Word
Channel 1 Configuration W
Channel 2 Configuration W
Channel 3 Configuration W
W
ords 4 7
(not defined)
ord
ord
ord
_
Unused
emperature Units
Filter Frequency
Channel Enable
T
Data Format
Open Circuit
000000000000000
Default Setting
Type J Thermocouple
•
Engineering Units x 1
•
Data Word = 0 If Open Circuit
•
Degrees Celsius
•
10 Hz. Filter Frequency
•
Channel Disabled
•
Bit
15
000010000000000
New Setting
Address
O:1.0
O:1.1
O:1.2
O:1.3
•
•
•
O:1.7
Input Image
W
ord 0
W
ord 1
W
ord 2
W
ord 3
•
•
•
W
ord 7
Chapter 4
(Preliminary
Operating
Considerations)
Chapter 5
(Channel
Configuration,
Data, and
Status)
Appendix B
(NT4
Configuration
Worksheet)
Type
Input
0
Bit 0
0
Set this bit (11) to enable channel. Address = O:1.0/11.
Publication 1746-UM007C-EN-P - July 2004
2-6 Quick Start for Experienced Users
7.
Program the configuration.
Do the programming necessary to establish the new configuration word setting in the previous
step.
1. Create integer file N10. Integer file N10 should contain one element for each channel used.
(For this example we only need one, N10:0.)
2. Enter the configuration parameters from step 6 for channel 0 into integer N10:0.
In this example all the bits of N10:0 will be zero except for the channel enable (N10:0/11).
3. Program an instruction in your ladder logic to copy the contents of N10:0 to output word O:1.0.
Example of Data Table for Integer File N10:
address
N10:0 0000 1000 0000 0000
15 data 0 address 15 data 0
First Pass Bit
S:1
] [
15
COP
COPY FILE
Source
# N10:0
Dest#
Length 1
O:1.0
On power up, the first pass bit
(S:1/15) is set for one scan, enabling
the COPY instruction that transfers a
one to bit 11 of channel configuration
word 0. This enables the channel..
Reference
Chapter 6
(Ladder
Programming
Examples)
Chapter 8
(Application
Examples)
8.Write the ladder program.Reference
Write the remainder of the ladder logic program that specifies how your thermocouple input data
will be processed for your application. In this procedure the addressing reflects the location of
the module as slot 1.
Chapter 5
(Channel
Configuration,
Data, and
Status)
Chapter 6
(Ladder
Programming
Examples)
Chapter 8
(Application
Examples)
Your
programming
device user
manual.
Address
I:1.0
I:1.1
I:1.2
I:1.3
•
•
•
I:1.7
W
W
W
W
W
ord 0
ord 1
ord 2
ord 3
•
•
•
ord 7
SLC 500 Controller
Data Files
Input Image
(8 words)
Channel 0 Data W
Channel 1 Data W
Channel 2 Data W
Channel 3 Data W
Channel 0 Status W
Channel 1 Status W
Channel 2 Status W
Channel 3 Status W
ord
ord
ord
ord
ord
ord
ord
ord
Output Image
Address
I:1.0
000000000000000
(V
ariable
Bit
15
Thermocouple Input Data)
0
Bit 0
Publication 1746-UM007C-EN-P - July 2004
Quick Start for Experienced Users 2-7
9.Go through the system start-up proceedure.Reference
Apply power. Download your program to the SLC and put the controller into Run mode. In this
example during a normal start up, the module status LED and channel status 0 LED turn on.
Chapter 7
(Module
Diagnostics and
Troubleshooting)
INPUT
CHANNEL
STATUS
MODULE STATUS
THERMOCOUPLE/mV
012
3
Channel LEDs
Module Status LED
10.Check module operation.Reference
(Optional) Monitor the status of input channel 0 to determine its configuration setting and
operational status. This is useful for troubleshooting when the blinking channel LED indicates
that an error has occurred. If the Module Status LED is off, or if the Channel 0 LED is off or
blinking, refer to chapter 7.
Chapter 5
(Channel
Configuration,
Data, and
Status)
Chapter 6
(Ladder
Programming
Examples)
W
W
W
W
ord 0
ord 1
ord 2
ord 3
•
•
ord 7
SLC 500 Controller
Data Files
Input Image
(8 words)
Channel 0 Data W
Channel 1 Data W
Channel 2 Data W
Channel 3 Data W
Channel 0 Status W
Channel 1 Status W
Channel 2 Status W
Channel 3 Status W
Output Image
ordW
ord
ord
ord
ord
ord
ord
ord
Type
Type
Open Circuit Error
Channel Status
Under Range Error
Configuration Error
Over Range Error
000010000000000
Bit
15
emperature Units
Filter Frequency
T
Address
Open Circuit
Data Format
Input
0
Bit 0
I:1.4
For this example, during normal operation only bit 11 is set.
Publication 1746-UM007C-EN-P - July 2004
Chapter 8
(Application
Examples)
2-8 Quick Start for Experienced Users
Publication 1746-UM007C-EN-P - July 2004
Installation and Wiring
This chapter provides:
• Compliance to European Union Directives
• Electrostatic Discharge
• NT4 Power Requirements
• Module Location in Chassis
• Module Installation and Removal
• Terminal Wiring
• Thermocouple Calibration
Chapter
3
Compliance to European
Union Directives
If this product has the CE mark it is approved for installation within
the European Union and EEA regions. It has been designed and tested
to meet the following directives.
EMC Directive
The Series B (or higher) 1746-NT4 is tested to meet Council Directive
89/336/EEC Electromagnetic Compatibility (EMC) and the following
standards, in whole or in part, documented in a technical construction
file:
• EN 50081-2
EMC - Generic Emission Standard, Part 2 - Industrial
Environment
• EN 50082-2
EMC - Generic Immunity Standard, Part 2 - Industrial
Environment
This product is intended for use in an industrial environment.
1Publication 1746-UM007C-EN-P - July 2004
3-2 Installation and Wiring
Electrostatic Discharge
Electrostatic discharge can damage semiconductor devices inside this
module if you touch backplane connector pins. Guard against
electrostatic damage by observing the precautions listed next.
ATTENTION
•
Wear an approved wrist strap grounding device when handling
the module.
Touch a grounded object to rid yourself of electrostatic charge
•
before handling the module.
Handle the module from the front, away from the backplane
•
connector. Do not touch backplane connector pins.
Keep the module in its static-shield bag when not in use, or
•
during shipment.
Electrostatic discharge can degrade performance or
cause permanent damage. Handle the module as
stated below.
NT4 Power Requirements
The thermocouple module receives its power through the SLC500
chassis backplane from the fixed or modular +5 VDC/+24 VDC chassis
power supply. The maximum current drawn by the module is shown
in the table below.
5V dc Amps24V dc Amps
0.060.04
When you are using a modular system configuration, add the values
shown in the table above to the requirements of all other modules in
the SLC chassis to prevent overloading the chassis power supply.
When you are using a fixed system controller, refer to the important
note about module compatibility in a 2-slot expansion chassis on page
3-3.
Publication 1746-UM007C-EN-P - July 2004
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