Omron SYSMAC CP Series User Manual page 249

Precautions for Correct Use Precautions for Correct Use
When connecting a thermocouple input, observe the following precautions:
• Do not remove the cold junction compensator attached at the time of delivery. If the cold junc-
tion compensator is removed, the Unit will not be able to measure temperatures correctly.
• Each of the input circuits is calibrated with the cold junction compensator attached to the Unit.
If the Unit is used with the cold junction compensator from other Units, the Unit will not be able
to measure temperatures correctly.
• Do not touch the cold junction compensator. Doing so may result in incorrect temperature
measurement.
(2) Analog Inputs
Last two channels can be used as analog inputs, but two of the analog inputs must be the
same range.
Temperature input 0
Temperature input 1
• Wiring for Analog Inputs
2-core shielded
twisted-pair cable
+
Analog
device with
voltage
−
output
Precautions for Correct Use Precautions for Correct Use
• When an input is not being used, short the + and – terminals.
• Separate wiring from power lines (AC power supply lines, high-voltage lines, etc.)
• When there is noise in the power supply line, install a noise filter on the input section and the
power supply.
CP2E CPU Unit Hardware User's Manual(W613)
8 Using Expansion Units and Expansion I/O Units
LOOP0+ LOOP1+
LOOP0− LOOP1− NC
Cold junction
compensator
V IN
Analog
I IN
input 2,3
COM
FG
LOOP2+ LOOP3+
I IN3
V IN2 V IN3
LOOP2− LOOP3−
NC I IN2
COM2 COM3
Analog Analog
device
device
with
with
voltage
current
output
output
Analog Analog
input 2 input 3
2-core shielded
twisted-pair cable
+
Analog
device with
current
−
output
V IN
Analog
I IN
input 2,3
COM
FG
8-77
8