Appendix 5. Troubleshooting; Appendix 5.1 Handling The A1S64Tc Errors - Mitsubishi Electric MELSEC-A Series User Manual

Appendix 5.
Simple troubleshooting methods for the use of A1S64TC are described in this
section.
Refer to the PC CPU User's Manual for the troubleshooting regarding the PC
CPU.

Appendix 5.1 Handling the A1S64TC errors

The following table shows the processing details of the A1S64TC when an error
occurs with the A1S64TC or PC CPU, or the PC CPU is changed from RUN to
STOP.
When an
A1S64TCTT
error occurs
During reset of PC CPU
When PC
CPU error
occurs
PC CPU RUN → STOP
When the remote I/O station has a link
error (when installed to a remote I/O sta-
tion)
!
DANGER
l
Take sufficient caution when setting the PID continue flag which controls
external output.
l
Erroneous output may be made due to the output element or internal
circuit malfunction.
For output signals that may cause significant damage, configure a circuit
which monitors them externally.
Troubleshooting
Status
When an error which
continues operations
occurs such as write
error
When an error which
stops the PC CPU op-
erations occurs
When an error which
continues the PC CPU
operations occurs
Processing details
Output status setting when in the setting
mode (buffer memory address : A9)
PID stop
The operation is continued with data before the
write that caused the write error at the buffer
memory address, and external output is per-
formed.
Stops operation and turns off external output.
Continues operation and performs external out-
put.
Stops operation and
turns off the external
output.
A-9
PID continue
Continues operation
and performs external
output.