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8 Using Expansion Units and Expansion I/O Units
8-50
CP1E CPU Unit Hardware User’s Manual(W479)
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.
•
If the same power supply is being used by the connected devices and a disconnection occurs at
points A or B in the above diagram, an unwanted circuit path will occur as shown along the dotted line
in the diagram. If that occurs, a voltage of approximately 1/3 to 1/2 of the output voltage of the other
connected device will be generated.
•
If that voltage is generated while the setting is for 1 to 5 V, open-circuit detection may not be possible.
•
If a disconnection occurs at point C in the diagram, the negative (-) side will be used for both devices
and open-circuit detection will not be possible.
This problem will not occur for current inputs even if the same power supply is used.
24 VDC
A
C
B
Analog
output
device 1
Analog
output
device 2
Internal
circuits
Summary of Contents for CP1E-E**D Series
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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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