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Fault Detection - Mitsubishi Electric MELSEC-A Series User Manual

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4.A2CCPU
- - - - - - - - - - - - - - - - - - - - MELSEC-A
4.3
Fault Detection
4.3.1
Self-dlagnosls
The self-diagnosis function checks occurrence of errors and faults by the
A2C itself.
The A2C self-diagnosis function includes the following:
(a) CPU error
(b) MINI link line error
(c) Remote terminal error
(1)
CPU error
CPU error includes faulty A2C, battery error, and operation check error.
If a CPU error is detected, the CPU error flag (M9008) is set and the
corresponding error code (see Table 4.8.) is set in the CPU error
register (09008).
(a) Operation at detecting CPU error
If a CPU error is detected. sequence program operation is
processed in the following manner.
1) Stop
Sequence program operation stops if an error is detected.
At this time, the outputs (y) of the remote I/O module and remote
terminal module are as indicated below.
Remole I/O Module
. EC Mode
ON/OFF Slelu. of Outpul (y)
A2C I/O module
-
OFF
Remote I/O module for
OFF
Output ON/OFF state Is retained
MINIS-3 link
ON
OFF
Remote terminal module
-
OFF
2) Continue
Sequence program operation continues if an error is detected.
If an operation error is detected while a sequence program is
executed, an instruction causing the error is skipped to con-
tinuously execute the program.
4-42
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