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8. TROUBLESHOOTING
ENGLISH
Digital input problem
Connect tester to the digital input channel where
problem occurred as shown in Figure 1, and find out
whether the input is normal.
Check the condition of
controller power connector's
connection.
Is input normal?
Is the connector properly
connected?
Is I/O board voltage
normal?
Check the condition of communi-
cation cable connection between
master board and slave board.
Is the main power of
controller normal?
Replace main board.
Measure the voltage of the
controller. (Refer to Figure 2.)
Are they normally
connected?
Re-connect
the cable
firmly.
Replace I/O board.
Check whether the pertain wires and input
sensor are operating normally.
N
N
N
N
N
Y
Y
Y
Y
Y
Figure 69 Digital input problem
Summary of Contents for LCWW
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