Omron CQM1-ARM21, Руководство по эксплуатации

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Error indicators
Section 6-1
54
6-1 Error indicators
The CQM1-ARM21 uses the following means of error indication:
•
LED indicators: RUN, ERR, APF, CER, Slave status LEDs.
See 2-1-2, LED Indicators.
•
Status Flags: Config_OK, Normal_Operation, System Error.
See 4-4-1, Status Flags.
In case of malfunctions, check the status of all LEDs and Status Flags, and
refer to the troubleshooting tables in this chapter to determine the cause.
6-2 Troubleshooting
Possible problems have been divided in the following categories:
•
PLC Errors
•
Start-up problems
•
Configuration problems
•
AS-Interface communication problems
6-2-1 PLC Errors
Mounting the AS-Interface master unit in a CQM1 PLC system can cause the
following errors to be indicated by the CQM1 CPU unit.
If the CQM1 CPU fails to start up correctly after power-on, the RUN LED of
the CQM1-ARM21 will blink to indicate that its initialisation could not be
completed.
Symptoms Possible cause Possible remedy
An I/O unit, or the end cover, is not connected
properly. Turn the PLC’s power OFF and check for
loose units. Lock all units together with the top
and bottom sliders an re-apply the power. I/O BUS ERR
FALS C0
CPU RUN LED
remains OFF
CPU ERR LED is
ON
An I/O unit is defective. Turn the PLC’s power OFF and one by one
remove the I/O units until the error
disappears. Replace the unit causing the
error.
I/O UNIT OVER
FALS E1
CPU RUN LED
remains OFF
CPU ERR LED is
ON
The number of I/O words on the installed I/O
units exceeds the maximum for this CPU type. Check the ARM21’s switch settings to
determine the number of I/O words required
by the Unit, and compare with the maximum
allowed value for the used CPU.
Turn the PLC’s power OFF, then either:
•
Reduce the ARM21’s I/O allocation.
•
Remove I/O units from the CQM1 system.
•
Select a CPU type with larger I/O
capacity.
See also 4-1,
PLC Settings
, for PLC CPU
types that support 31 AS-Interface slaves.