Operation Error - Mitsubishi Electric FR - F700 Programming Manual

3.22 Operation error

When a basic instruction is used, an operation error will occur in the following
case.
(a) If any error described in the description of the corresponding instruction
occurs.
POINT
Note that if the device designation range is outside the corresponding device
range, an operation error does not occur and data is written to other than the
specified device.
(1) Error processing
If an operation error occurred at execution of a basic instruction, the error flag
turns on and the error step number is stored into the error step storage register.
M9010 ... Turns on at an operation error and turns off if the next basic
Error flag
M9011.... Turns on at the first operation error.
D9010 .... Stores the first step number of the instruction where an operation
Error step
storage register
D9011 .... Stores the first step number of the instruction where an operation
1) D9011 stores the step number of the instruction where an operation error occurred
when M9011 turned from OFF to ON. Therefore, D9011 data does not change if
M9011 remains on.
2) To reset M9011 and D9011, program as shown below.
Reset command
Reset command
Fig 3.31 Special Relay and Register Resetting Ladder
3) Whether sequence processing will be stopped or continued at occurrence of an
operation error can be selected by built-in PLC function parameter setting. Refer to
page 101 for details.
M50 to M65 are the targets, but actual
setting range is M0 to M63, and error does
not occur since M64 and M65 do not exist.
instruction is normal.
error occurred.
error occurred first.
Operation error
Resets (turns off) M9011.
Resets D9011.
(Clears D9011 to 0.)
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