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8 Using Expansion Units and Expansion I/O Units
8-36
CP1E CPU Unit Hardware User’s Manual(W479)
(3) Wiring analog input devices to the Analog I/O Unit
Precautions for Correct Use
Precautions for Correct Use
•
Do not connect the shield when using shielded twisted-pair cables.
•
When an input is not being used, short V IN and I IN to COM 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 terminals.
Additional Information
Refer to the following information on open circuits when using voltage inputs.
Example: If connected device 2 is outputting 5 V and the same power supply is being used for both
devices as shown above, approximately 1/3, or 1.6 V, will be applied to the input for input device 1.
If a wiring disconnection occurs when voltage input is being used, the situation described below will
result. Either separate the power supplies for the connected devices, or use an isolator for each input.
FG
FG
V OUT
COM
I OUT
V OUT
COM
I OUT
Analog
device
with
voltage
input
+
−
+
−
Analog
Output
Unit
Analog
device
with
current
input
Analog
Output
Unit
2-core shielded
twisted-pair cable
2-core shielded
twisted-pair cable
24 VDC
A
C
B
Analog
output
device 1
Analog
output
device 2
Internal
circuits
Summary of Contents for CP1E-E**D Series
Page 3: ......
Page 66: ...2 Basic System Configuration and Devices 2 22 CP1E CPU Unit Hardware User s Manual W479...
Page 318: ...Appendices A 54 CP1E CPU Unit Hardware User s Manual W479...
Page 322: ...Index 4 CP1E CPU Unit Hardware User s Manual W479...
Page 324: ...Revision 2 CP1E CPU Unit Hardware User s Manual W479...
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