1.5.5
Wiring Check Adapter for Digital Input
The wiring check adapter for digital input is a device for inspecting the wiring conditions be-
tween the digital input module and the field devices so as to find out the open circuit or short
circuit problems.
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Types of Wiring Check Adapter
The following two models of wiring check adapters are available.
•
SCB100: For testing open circuit
Putting this tester in parallel with the field device switch, the open circuit of the loop dur-
ing the OFF signal can be found.
•
SCB110: For testing short circuit
Putting this tester in series with the field device switch, the short circuit of the loop during
the ON signal can be found with the power line or other channels.
When testing for open circuits or short circuits, install the previously mentioned adapters and
activate the diagnostic features in the input modules.
SEE
ALSO
For more information about diagnostic features of the input modules, refer to:
“■ Items set for each channel (discrete input)” in A4.6, “Items set for discrete inputs” in Safety Control
Station Reference (IM 32Q03B10-31E)
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External View of Wiring Check Adapter
The following figure shows the external view of SCB100/SCB110 wiring check adapter.
Figure 1.5.5-1 External View of SCB100/SCB110 Wiring Check Adapter
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Usage of Wiring Check Adapter
Connect the wiring check adapter as follows: In the following figures, DCn and INn indicate
the input channel numbers for SDV144.
DCn
INn
SDV144
SCB100
DCn
INn
SDV144
Red
Blue
SCB110
DCn
INn
SDV144
Red
Blue
SCB100
SCB110
field device switch
• Parallel connection
• Serial connection
• Serial and parallel connections
Figure 1.5.5-2 Usage of Wiring Check Adapter
IMPORTANT
Do not stress the wiring check adapter.
SCB110 has a polarity. It does not work properly if you install it wrongly.
<1.5 Accessories Related to Input/Output Modules >
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IM 32Q06C10-31E
4th Edition : Jan.30,2015-00
