174
D320 PLC User's Manual
I/O Check
This page presents an example of a troubleshooting procedure to follow when errors are encountered
with the external I/O. In this example, a digital input module is located in slot 0 (R0), and a digital
output module is located in slot 1 (R1). This flow chart is based on the following circuit, and assumes
that the error encountered is that the output connected to R1.0 is not turned On when it should be.
R0.2 R0.3 R1.0
(OUT)
Start
Is the R1.0
Output LED On?
Is R1.0 On
in the PLC? Use GPC to
monitor
Replace the output module
To Flow 2
Is the voltage
at the output device
correct?
Check/replace the output
device as needed
Is the voltage
at the R1.0 terminal
correct?
Is the screw
loose or defective at
the terminal?
Fix/replace wiring
Is the wiring to
the output correct?
Check/replace the output
device as needed
Is the wiring
broken/shorted?
Replace screw
and/or terminal strip
Yes
No
Yes
No
No
Yes
No
Yes
No
Yes
Yes
No
No
Yes
Содержание D320 PLC
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