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MELSEC-Q
7 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL
Starting conditions
To start the control, the following conditions must be satisfied.
The necessary start conditions must be incorporated in the sequence program so
that the control is not started when the conditions are not satisfied.
Device
Signal name
Signal state
Axis 1 Axis 2 Axis 3 Axis 4 Axis 5 Axis 6 Axis 7 Axis 8
PLC READY signal
ON PLC CPU ready
Y0
Module READY signal
ON QD70 ready
X0
Axis error occurrence signal
OFF No error
X1
Axis stop signal
OFF Axis stop signal being OFF
Y10
Y11
Y12
Y13
Y14
Y15
Y16
Y17
Start complete signal
OFF Start complete signal being OFF
X10
X11
X12
X13
X14
X15
X16
X17
In
te
rf
ac
e s
ignal
BUSY signal
OFF QD70 not operating
X8
X9
XA
XB
XC
XD
XE
XF
Operation when starting
(1) When the positioning start signal turns ON, the start complete signal and BUSY
signal turn ON, and the OPR control or positioning control starts.
It can be seen that the axis is operating when the BUSY signal is ON.
(2) When the positioning start signal turns OFF, the start complete signal also turns
OFF.
If the positioning start signal is ON even after OPR control positioning control is
completed, the start complete signal will remain ON.
(3) If the positioning start signal turns ON again while the BUSY signal is ON, the
warning "operating start (warning code: 10)" will occur.
(4) The process taken when positioning control is completed will differ according to
case (a) and (b) below.
(a) When next positioning control is not to be carried out
•
After the preset time of the dwell time has elapsed, positioning control is
completed.
•
On completion of positioning control, the BUSY signal turns OFF and the
positioning complete signal turns ON. However, it does not turn ON if the
positioning complete signal output time is "0".
•
When the positioning complete signal output time elapses, the positioning
complete signal turns OFF.
(b) When next positioning is to be carried out
•
After the preset time of the dwell time has elapsed, next positioning control
is started.
Positioning start signal
[Y8 to YF]
OFF
ON
Start complete signal
[X10 to X17]
OFF
ON
BUSY signal
[X8 to XF]
OFF
ON
Positioning complete signal
[X18 to X1F]
OFF
ON
Positioning control
V
t
Dwell time
Dwell time
Dwell time
Fig. 7.3 ON/OFF timing of each signal at start of positioning control
Содержание GX Configurator-PT
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