Mitsubishi Electronics 700 Series, FR-A700 specifications Operation Error, Error processing

Operation Error

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.

M50 to M65 are the targets, but actual setting range is M0 to M63, and error occurs since M64 and M65 do not exist.

(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.

Error flag

Error step storage register

M9010 ... Turns on at an operation error and turns off if the next basic instruction is normal.

M9011.... Turns on at the first operation error.

D9010 .... Stores the first step number of the instruction where an operation

error occurred.

D9011 .... Stores the first step number of the instruction where an operation

error occurred first.

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	Resets (turns off) M9011.
Reset command	Resets D9011.
	(Clears D9011 to 0.)

Fig 3.28 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 94 for details.

102