Omron CP1H CPU Operation Manual page 429

Analog Input Units
Internal Circuits
+
Analog
device with
voltage
−
output
Note
2. Wiring Analog Inputs
510 kΩ
510 kΩ
510 kΩ
510 kΩ
Analog ground
■ Wiring for Analog Inputs
V IN
Analog
I IN
Input
Unit
COM
(1) Use shielded twisted-pair cables, but do not connect the shield.
(2) When an input is not being used, short the + and – terminals.
(3) Separate wiring from power lines (AC power supply lines, high-voltage
lines, etc.)
(4) When there is noise in the power supply line, install a noise filter on the
input section and the power supply.
(5) Refer to the following information on open circuits when using voltage in-
puts.
V IN1
250 Ω
I IN1
Analog input 1
COM1(−)
to
V IN4
250 Ω
I IN4
Analog input 4
COM4(−)
AG
+
Analog
device with
current
−
output
Section 7-2
to
V IN
Analog
I IN
Input
Unit
COM
395