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MELSEC-Q
14 DEDICATED INSTRUCTIONS
END
processing
END
processing
END
processing
END
processing
OFF
OFF
OFF
ON
ON
ON
When
completed
abnormally
When
completed normally
1 scan
PSTRT instruction
execution completion
PLC program
PSTRT instruction
Complete device
Complete state display
device
[Errors]
(1) When an PSTRT 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 a measure against the error referring to Section 15.2 "List of error
codes".
[Precautions]
(1) If the positioning is started by the PSTRT instruction, the positioning start signals
(Y10 to Y13) and start complete signals (X10 to X13) will not turn ON.
Confirm the operation during the positioning control using the PSTRT
start
instruction and BUSY signals (XC to XF).
(2) If the stop instruction is input before completion of the positioning which has been
started by the PSTRT
instruction, the completion device (D) turns the 1-scan ON
to complete execution of the PSTRT
instruction.
(3) The following dedicated instructions cannot be executed simultaneously for the
same axis.
(Can be executed simultaneously for different axes.)
• Positioning start instructions (PSTRT1 to PSTRT4)
• Teaching instructions (TEACH1 to TEACH4)
(4) The PSTRT
instruction can only be executed when the QD75 READY signal
(X0) is turned ON.
Even if the PSTRT
instruction execution request is given when the QD75
READY signal is turned OFF, the PSTRT
instruction will not be executed. (not
processed.)
Before executing the PSTRT
instruction, turn ON the PLC READY signal (Y0),
and turn ON the QD75 READY signal (X0).
(5) When the remote I/O station
(Q Corresponding MELSECNET/H network remote
I/O module) is used, the dedicated instruction (PSTRT
) is unusable.
: For details of the remote I/O station, refer to Q Corresponding MELSECNET/H
Network System Reference Manual (Remote I/O Network).