C Troubleshooting - Omron CQM1H series Operation Manual

Indicator Status During Normal Operation
f: Lit, Y: Flashing, X: Not lit
Master
RDY T/R T/R
RDY
f f Y
X
Any other indicator display indicates an error. Refer to the table below.
Indicator Alarm Table
The table below shows the description and remedy of an error occurring in the G730 Interface Unit.
f: Lit, Y: Flashing, X: Not lit, "––": Status not relevant.
Error
RDY T/R T/R
RDY
Errors X –– ––
before or
after
normal
operation
–– X X
f Y
Errors X
before
normal
f Y
X
operation
f Y
X
Appendix B
Troubleshooting
Expansion
END NODE ALM RDY
f
X X
Master Expansion
Master
END NODE ALM RDY
–– –– –– X
X X X ––
f fX f
––
f f
X ––
Y f
X ––
Slave
Master
T/R PWR T/R
Y f Y
Description
T/R
–– Power not turned on.
Units not completely
connected.
End cover not attached.
–– Abnormal Master.
f
Slave address set between #28
and #30.
f
No terminator set.
Multiple terminators exists in a
system.
Different types of
communications Master exist.
Transmission path shorted.
Transmission path
discontinuity.
Transmission path + and –
wiring reversed.
Expansion Masters exist with
the same input/output type and
duplicate unit #.
Expansion Masters exist with
the same input/output type and
duplicate system address.
The Slave set as terminator is
not turned on.
The terminator is set to Slave
address #31.
f
Multiple terminators set
Comments
All T/R indicators flash.
Remedy
Turn the power on.
Refer to unit manual and
correct set up.
Turn power off and back on.
Replace Master if same error
re-occurs.
Set Slave address between #0
and #27.
Set the Slave connected at the
end as the terminator.
Only one terminator allowed
per system. Wire separate
systems with one Master each.
Do not mix Master (G7M21)
with different types of
communications Master.
Correctly wire the transmission
path.
Correct settings to give unique
unit # and Slave address.
Turn on the terminator Slave.
Set terminator Slave address
between #0 and #27.
Set only the final Slave to
terminator.
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