Rockwell Automation 1797-IRT8 FLEX Ex Thermocouple/RTD Module - Manual (Page 9)

FLEX Ex Thermocouple/RTD Input Module 9
Publication 1797-5.4 - June 2010
d. Connect the tail of the CJC as follows:
• when using inputs 0 to 3 (row A) only for thermocouple inputs:
connect the tail of CJC1 to terminal 5 and CJC2 to terminal 12 on row
A.
• when using inputs 4 to 7 (row B) only for thermocouple inputs:
connect the tail of CJC1 to terminal 22 and CJC2 to terminal 29 on
row B.
• when using thermocouple inputs 0 to 7: connect the tail of CJC1 to
terminal 5 on row A, and CJC2 to terminal 29 on row B.
3. Connect +V to terminal 34 on the 34 to 51 row (C).
4. Connect -V to terminal 35 on the 34 to 51 row (C).
5. If continuing power to the next terminal base unit, connect a jumper from
terminal 50 (+V) on this base unit to terminal 34 on the next base unit.
6. If continuing common to the next terminal base unit, connect a jumper
from terminal 51 (-V) on this base unit to terminal 35 on the next base
unit.
IMPORTANT
Whenever you use thermocouple inputs, you must use both
cold junction compensators
WARNING
Make certain that you power this module with an intrinsically
safe power supply. Do not exceed the values listed in the
specifications for this module.
If you connect or disconnect wiring while the field-side 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.