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Analog Input Units Section 7-2
Internal Circuits
■ Wiring for Analog Inputs
Note (1) Connect the shield to the FG terminal to prevent noise.
(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.
2. Wiring Analog Inputs
AG
Analog input 4
Analog ground
COM1(−)
I IN1
V IN1
COM4(−)
I IN4
V IN4
510 kΩ
510 kΩ
510 kΩ
510 kΩ
250 Ω
250 Ω
Internal circuits
Analog input 1
to
to
V IN
COM
I IN
V IN
COM
I IN
Analog
device with
voltage
output
Analog
Input
Unit
+
−
+
−
Analog
device with
current
output
Analog
Input
Unit
FG
FG
2-core shielded
twisted-pair cable
2-core shielded
twisted-pair cable
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