Mitsubishi MELSEC-Q QD77MS, User Manual

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15- 16
Chapter 15 Dedicated Instructions
[Functions]
(1) This dedicated instruction is used to return the setting data set in the QD77MS
buffer memory and flash ROM to their factory-set data (initial values).
Refer to Section 14.2 for initialized setting data.
(2) The ZP.PINIT instruction completion can be confirmed using the complete devices
((D)+0) and ((D)+1).
(a) Complete device ((D)+0)
This device is turned ON by the END processing of the scan for which
ZP.PINIT instruction is completed, and turned OFF by the next END
processing.
(b) Complete state display device ((D)+1)
This device is turned ON and OFF according to the state in which ZP.PINIT
instruction is completed.
• When completed normally
: Kept unchanged at OFF.
• When completed abnormally : This device is turned ON by the END
processing of the scan for which ZP.PINIT
instruction is completed, and turned OFF by
the next END processing. (same ON/OFF
operation as complete device).
END
processing
END
processing
END
processing
END
processing
OFF
OFF
OFF
ON
ON
ON
When
completed
abnormally
When
completed normally
1 scan
ZP.PINIT instruction
execution completion
Sequence program
ZP.PINIT instruction
Complete device
Complete state display
device
[Errors]
(1) When a dedicated instruction is completed abnormally, the error complete signal
((D)+1) is turned ON, and the error code is stored in the complete status ((S)+1).
Check and take measures against the error referring to Section 16.5 "List of
errors".
[Precautions]
(1) The ZP.PINIT instruction can only be executed when the QD77 READY signal [X0]
is turned OFF.
When the QD77 READY signal [X0] is turned ON, the ZP.PINIT instruction cannot
be executed.
Before executing the ZP.PINIT instruction, turn OFF the PLC READY signal [Y0]
and then turn OFF the QD77 READY signal [X0].
(2) A writing to the flash ROM is up to 100,000 times.
If writing to the flash ROM exceeds 100,000 times, the writing to the flash ROM will
become impossible.