User Manual

Chapter 2: Quick Start for Experienced Users 13
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.
Grounding
!
ATTENTION! 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.
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 preferred location is
as follows.
- For grounded thermocouples or millivolt sensors, this is at the sensor
end.
- For RTD and resistance sensors, this is at the module end.
- For insulated/ungrounded thermocouples, this is at the module end.
Contact your sensor manufacturer for additional details.
Refer to Industrial Automation Wiring and Grounding Guidelines,
Allen-Bradley publication 1770-4.1, for additional information.
The terminal connections for the CJC sensor are shown below: