Power supply flowchart
For PC and I/O link unit
POWER indicator off*
*RUN and ERROR/ALARM indicators also off
Supply power
POWER indicator lit?
Supply power in rated range
POWER indicator lit?
Replace fuse
POWER indicator lit?
Power supplied?
Supply voltage
in rated range?
Loose screws
on terminal block/break
Tighten loose screws/replace
in lead wires?
lead wires
POWER indicator lit?
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