Rockwell Automation 1797-IRT8 FLEX Ex Thermocouple/RTD/mV Input Module User Manual - Manual (Page 35)

Publication 1797-6.5.2 - February 2001
How to Install Your FLEX Ex Thermocouple/RTD/mV Module 3-11
Wiring connections for the 1797-IRT8 Module
1. For RTD inputs:
a. connect the individual source current input wiring to (+)
terminals for each individual channel (0, 4, 8 and 12) on the 0-15
row (A) and terminals 17, 21, 25, and 29 on the 16-33 row (B) as
indicated in the table below.
b. connect the associated signal return (-) to the corresponding (-)
terminals (3, 7, 11, and 15) on the 0-15 row (A), and terminals 20,
24, 28 and 32 on the 16-33 row (B).
2. For thermocouple inputs:
a. connect the individual high signal input wiring to (L) terminals
for each individual channel (2, 6, 10, and 14) on the 0-15 row (A)
and terminals 19, 23, 27 and 31 on the 16-33 row (B) as indicated
in the table below.
b. connect the associated low signal (-) to the corresponding (-)
terminals (3, 7, 11 and 15) on the 0-15 row (A), and terminals 20,
24, 28, and 32 on the 16-33 row (B).
c. connect cold junction compensation wiring to terminals 37, 38
and 39, and terminals 46, 47 and 48.
d. Connect the tail of the CJC as follows:
• when using inputs 0-3 (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 4-7 (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 0-7: connect the tail of CJC1 to
terminal 5 on row A, and CJC2 to terminal 29 on row B.
Important: Whenever you use thermocouple inputs, you must use
both cold junction compensators.
3. Connect +V to terminal 34 on the 34-51 row (C).
4. Connect -V to terminal 35 on the 34-51 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.
ATTENTION
!
ATTENTION: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.