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8.2 Error Clear
8
4) Error clear processing is performed by END processing.
Therefore, an error cannot be cleared unless the END instruction is executed
with SM50 ON.
(2) Clearing the Standby System CPU Module Error by the Control System
CPU Module
A standby system CPU module error is cleared with the user program of the control
system CPU module, using SM1649 and SD1649.
When using GX Developer connected to the control system CPU module to clear a
standby system CPU module error, SM1649 and SD1649 are also used.
(a) Procedure
Error clear is performed according to the following procedure.
1) Remove the cause of the target error from the standby system.
2) Store the corresponding error code into SD1649 in the control system CPU
module.
3) Turn SM1649 in the control system CPU module from OFF to ON.
4) The target error is cleared from the standby system.
(b) Cautions
1) Error clear using SM1649 and SD1649 is enabled in the control system CPU
module only.
If this method is executed in the standby system CPU module, the standby
system error will not be cleared.
The operation modes applicable to this error clear method are shown in
Table8.2.
: Standby System Error Clear Enabled, : Standby System Error Clear Disabled,
–: Irrelevant as Standby System Does not Exist
2) When the corresponding error code is stored in SD1649 and error clear is
performed, the last digit of the code No. will be ignored.
When multiple errors, of which codes are different in the last digit only, occur,
the errors can be simultaneously cleared.
[Example]
If errors that correspond to error codes 2100 and 2101 occur, both of them
will be simultaneously cleared even when either one is cleared.
In the case of errors that correspond to error codes 2100 and 2111, both of
them will not be simultaneously cleared even when either one is cleared.
Table8.2 Operation Modes Applicable to Clearing the Standby System Error using SM1649 and SD1649
Operation Mode
CPU Module Performing Error Clear
Control System CPU Module
Standby System CPU Module
Backup Mode
Separate Mode
Debug Mode
–
–
