14 - 10
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
Sequence program
PSTRT instruction
Complete device
Complete state display
device
[Errors]
(1) When an PSTRT instruction is completed abnormally, the er ror complete signal
((D)+1) is turned ON, and the error code is st ored 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) When 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.
To confirm that positioning control is being executed, use the PSTRT start
command or BUSY signals (XC to XF).
(2) If, after positioning has been started by the PSTRT instructio n, a stop command
is input before positioning is complete , the complete device (D) turns ON one sca n
and the execution of the PSTRT instruction is completed.
(3) The following dedicated instructions cannot be executed simul t ane ou sly fo r the
same axis.
(Can be executed simultaneously for different ax es.)
• Positioning start instructions (PSTRT1 to P STRT4)
• Absolute position restoration instruct ions (ABRST1 to ABRST4)
• Teaching instructions (TEACH1 to TEACH4)
(4) The PSTRT instruction can only be executed when the QD75 R EADY 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 ex ecuted. (not
processed.)
Before executing the PSTRT instruction, turn ON the PLC READY s ignal (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 C orresponding MELSECNET/H
Network System Reference Manual (Remote I/O Network ).