Omron SYSMAC C Series Operation Manual page 90

Installation, Settings, and Wiring
Differential Source with Multiple Points (Single Reference)
Precautions
Source
+
–
+
–
+
–
+
–
G
Note Only one ground should be connected at the source when multiple points are
connected to the Unit.
Observe the following precautions when wiring the Analog Input Unit.
• Use shielded twisted-pair cables for signals lines.
• Keep all cables as short as possible.
• Analog signal cables contain positive and negative lines. Do not reverse the
polarity when wiring the inputs.
• Never wire low-voltage cables (such as analog input cables) near high-voltage
cables.
• Use wiring ducts for all cables and place signal cables and power cables in
separate ducts.
• Do not bend the cables past their natural bending radius.
• Do not wire cables in places subject to vibration.
• Short the positive and negative terminals on all unused inputs to reduce exter-
nal interference. If the terminals are not shorted, an out-of-range error may oc-
cur, causing the ERROR indicator to light.
Section 5-3
A
n
B
n
A
n +1
B
n +1
A
n +2
B
n +2
Shield
A
n
B
n
Shield
75