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MELSEC-Q
6 PLC PROGRAM USED FOR POSITIONING CONTROL
POINT
The BUSY signal [XC, XD, XE, XF] turns ON even when position control of
movement amount 0 is executed. However, since the ON time is short, the ON
status may not be detected in the PLC program.
(The ON status of the start complete signal [X10, X11, X12, X13], positioning
complete signal [X14, X15, X16, X17] and M code ON signal [X4, X5, X6, X7] can
be detected in the PLC program.)
Starting time chart
The time chart for starting each control is shown below.
(1) Time chart for starting "machine OPR"
QD75 READY signal
Start complete signal
BUSY signal
Error detection signal
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
9001
ON
ON
OFF
OFF
Near-point dog
V
t
OPR request flag
[ Md. 31 Status: b3]
Cd. 3 Positioning start No.
Positioning start signal
[Y10]
PLC READY signal
[Y0]
[X0]
[X10]
[XC]
[X8]
OPR complete flag
[ Md. 31 Status: b4]
Zero signal
OFF
ON
All axis servo ON
[Y1]
OFF
ON
Fig. 6.4 Time chart for starting "machine OPR"