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8-9
8 Using Expansion Units and Expansion I/O Units
CP1E CPU Unit Hardware User’s Manual(W479)
8-
1 An
alog
Inp
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its
8
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Additional Information
Refer to the following information on open circuits when using voltage inputs.
For 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 pos-
sible.
•
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.
A
C
B
Analog
output
device
1
Analog
output
device
2
24 VDC
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...
Page 325: ......