Mitsubishi Electric MELCEC Q Series User Manual page 57

4. CPU MODULE
(4)
REMARK
Diagnostic Item
Instruction code check
Parameter setting check
No END instruction
Unable to execute instruction
Format (CHK instruction)
check
Unable to execute instruction
(To the next page)
When detecting an error by self-diagnosis, QCPU takes action in the following
modes:
• Mode wherein the programmable controller operation is stopped
• Mode wherein the programmable controller operation is continued
In addition, some errors can be skipped or stopped by setting parameters.
(a) When an operation stop error is detected by the self-diagnosis, the AnSHCPU
stops the operation at error detection, and sets the all outputs(Y) to OFF.
(b) When an error of operation continued is detected, the only part of the program
with the error is not executed while the other part is executed.
Also, in the case of module verify error, the operation is continued using the I/O
address prior to the error.
Since error occurrence and error contents are stored in the special relay (M) and
special register (D) at error detection, use in the program for preventing any
malfunctions of the programmable controller or mechanical system especially in
mode wherein the programmable controller operation is continued.
Error definition detected by the self-diagnosis are shown in the next page.
(1) As to the LED indication message, the order of priority of the LED
indication can be changed if CPU module is in the operation mode.
(Error codes are stored in the special register.)
(2) When the special relay M9084 is on, checking on fuse blown, I/O
verification and the battery are not performed. (Error codes are not
stored in the special register.)
(3) The "Error indication of peripheral device" in the table of self-diagnostics
functions are messages that is indicated by the programmable controller
diagnosis of peripheral devices.
Self-diagnostics list
Diagnostic Timing
When each instruction is executed
• When switching on or resetting
•
When switching from (STOP, PAUSE) to
(RUN, STEP RUN)
• When M9056 or M9057 is on
•
When switching from (STOP, PAUSE) to
(RUN, STEP RUN)
•
CJ SCJ JMP CALL(P) FOR to NEXT
When each instruction is executed
•
When switching from (STOP, PAUSE) to
(RUN, STEP RUN)
•
When switching from (STOP, PAUSE) to
(RUN, STEP RUN)
• When interruption occurs
•
When switching from (STOP, PAUSE) to
(RUN, STEP RUN)
CPU Module Status of
Status RUN LED
Stop Flickering
4 - 11
Error Code
Error Message
(D9008)
INSTRCT CODE ERR. 10
PARAMETER ERROR 11
MISSING END INS 12
CAN'T EXECUTE(P) 13
CHK FORMAT ERR. 14
CAN'T EXECUTE(I) 15