Rockwell Automation 1746-NT8 SLC 500 Thermocouple/mV Analog Input Module User Manual - Manual (Page 29)

Publication 1746-UM022B-EN-P - January 2005
Installing And Wiring Your Module 2-11
Terminal Block Diagram with Input Cable
The module also has a ground terminal TB1, which should be
grounded to a chassis mounting bolt with 14-gauge wire.
Cold-Junction Compensation (CJC)
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. Two cold-junction compensating sensors have
been integrated in the removable terminal block. They must remain
installed.
Thermocouple or mV Ca ble
CJC A+
CJC A-
CJC B -
CJC B +
Ch annel 0+
Ch annel 7-
Ch annel 7+
Ch annel 6-
Ch annel 6+
Ch annel 5-
Ch annel 5+
Ch annel 4-
Ch annel 4+
Ch annel 3-
Ch annel 3+
Ch annel 2-
Ch annel 2+
Ch annel 1-
Ch annel 1+
Ch annel 0-
Shield for CH 0 and CH 1
Shield for CH 2 and CH 3
Shield for CH 4 and CH 5
Shield for CH 6 and CH 7
TB1
R ecommended Torque:
TB 1 0.3 to 0.5 Nm (2.5 to 4.5 in-lb)
ATTENTION
Possible Equipment Operation
Do not remove or loosen the cold-junction
compensating temperature transducers located on
the terminal block. Both CJCs are required to ensure
accurate thermocouple input readings at each
channel. The module will not operate in
thermocouple mode if a CJC is not connected.
Failure to observe this precaution can cause
unintended equipment operation and damage.