Processing Performed By The Q64Tc At Error Occurrence - Mitsubishi Electric MELSEC Q Series User Manual

8 TROUBLESHOOTING

8.2 Processing Performed by the Q64TC at Error Occurrence

Control output setting for CPU stop
PID continuation flag
When programmable controller CPU is
switched from RUN to STOP
At programmable controller CPU stop
error occurrence
At the Q64TC write error occurrence
At the Q64TC hardware error
occurrence
During programmable controller CPU
reset
WARNING
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REMARK
1) The error code "4" is stored if data outside the setting range is written to the input
range area or alert mode setting area in the setting mode.
If you switch the setting mode to the operation mode without making error reset,
the error code changes to "3".
In this case, perform the error processing of the error code "3".
2) The errors have the following priorities.
If a higher-priority error occurs during occurrence of a lower-priority error, the
error code and error occurrence address of the lower-priority error is overwritten
by those of the higher-priority error.
[Priority]
6 3 5
Higher
The Q64TC performs processing as explained below if an error occurs in the Q64TC/
programmable controller CPU or when the programmable controller CPU is switched
from RUN to STOP.
Status
error
In accordance with
stop mode setting
Operation is stopped and external output is
turned off.
In accordance with operation to be performed at error in Table 8.1 Error code list
Depending on hardware error condition
Module itself becomes inoperative and external output is not provided.
• Be extremely careful when setting the PID continuation flag (buffer memory
address: A9 ) which controls the external output.
H
• Abnormal output may be provided due to a failure of an output element or its internal
circuit.
Install an external monitoring circuit for the output signals which may lead to serious
accidents.
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For the same priority level, the lower
2/4
error address takes precedence.
Lower
CLEAR
Stop Continue
Operation is continued
and external output is
provided.
Processing
HOLD
Stop
Operation is continued
In accordance with
and external output is
stop mode setting
provided.
Operation is continued
In accordance with
and external output is
stop mode setting
provided.
MELSEC-Q
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