Mitsubishi Electric MELSECQ Series User Manual page 124

APPENDICES
Sequence program
G(P).PPCVRD
Completion device (D)
Completion status
indication device (D) + 1
APPX
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(1) Function
(a) Reads the periodic pulse count value.
(b) When reading the periodic pulse count value with the G(P).PPCVRD instruction,
consistency between the previous periodic pulse count value and the present
periodic pulse count value is retained. (Refer to Section 5.5.)
(c) Completion device (D) and completion status indication device (D) +1 are
available for the interlock signal of the G(P).PPCVRD instruction.
1) Completion device
Turns ON at END processing in the scan where the G(P).PPCVRD
instruction is completed, and turns OFF at the next END processing.
2) Completion status indication device
Turns ON/OFF according to the status on completion of the G(P).PPCVRD
instruction.
Normal completion: Remains OFF.
Error completion: Turns ON at END processing in the scan where the
G(P).PPCVRD instruction is completed, and turns OFF at the next END
processing.
END
processing
ON
OFF
instruction
ON
OFF
ON
OFF
Figure APPX.2 Timing chart of the G(P).PPCVRD
(d) If the channels differ, the G(P).PPCVRD instructions can be executed
concurrently. For example, the G(P).PPCVRD1 instruction and G(P).PPCVRD2
instruction can be executed concurrently.
(e) The G(P).PPCVRD instruction can be executed while the module READY signal
is ON. If executed while the signal is OFF, the instruction is ignored.
(2) Error
There are no errors regarding the instruction.
Appendix 1 Dedicated Instructions
Appendix 1.2 G(P). PPCVRD
search engine
END
processing
Completion of the G(P).PPCVRD
instruction
END END
processing processing
instruction
Error
completion
Normal
completion
1 scan