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MELSEC-Q
11 MANUAL CONTROL
Operations when stroke limit error occurs
When the hardware stroke limit error or the software stroke limit error is detected
during operation, the operation will decelerate to a stop. However, "
Md.26
Axis
operation status" will keep the status "Manual pulse generator operation" in that
case.
1
After stopping, manual pulse generator input pulses to the outside direction of the
limit range are not accepted, but operation can be executed within the range.
1: Only when the current feed value or the current machine feed value overflows
or underflows during deceleration, the manual pulse generator operation will
terminate as "
Md.26
Axis operation status" is changed to "Error". To carry
out manual pulse generator operation again, "
Cd.21
Manual pulse generator
enable flag" must be turned OFF once and turn ON.
Upper/lower
limit signal
Manual pulse generator
operation possible
Manual pulse generator
operation not possible
V
Manual pulse
generator operation
ON
OFF
Manual pulse generator operation timing and processing time
The following drawing shows details of the manual pulse generator operation
timing and processing time.
Manual pulse generator input
pulses
BUSY signal [XC,XD,XE,XF]
Start complete signal
[X10, X11, X12, X13]
Pulse output to external
source (PULSE)
Positioning operation
Manual pulse generator
enable flag (axis control data)
Axis operation status
t1
t3
t4
Standby
t2
001
StandbyManual pulse generator operation
The start complete signal does not turn ON in manual pulse generator operation.
Cd. 21
Md. 26
Fig. 11.17 Manual pulse generator operation timing and processing times
Normal timing times
Model t1 t2 t3 t4
QD75P N/QD75D N 0 to 0.9ms 1.7 to 30.2ms 58.6 to 87.6ms 28.4 to 57.2ms
QD75P /QD75D 0 to 2.6ms 6.2 to 32ms 60.4 to 90ms 28.4 to 57.6ms
•
Delays may occur in the t1 timing time due to the operation status of other axes.
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