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MELSEC-Q
6 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL
[3] Order of priority for stop process
The order of priority for the QD75 stop process is as follows.
Deceleration stop < Sudden stop < Servo OFF
(1) During deceleration (including automatic deceleration), the operation will stop
at that deceleration speed even if the decelerations to command turns ON or a
deceleration stop cause occurs.
(2) If the stop signal designated for sudden stop turns ON or a stop cause occurs
during deceleration, the sudden stop process will start from that point.
However, if the sudden stop deceleration time is longer than the deceleration
time, the deceleration stop process will be continued even if a sudden stop
cause occurs during the deceleration stop process.
Positioning speed
Deceleration
stop process
Stop
Sudden
stop cause
Sudden stop deceleration process
Deceleration stop process continues Process for sudden stop
Positioning speed
Deceleration
stop process
Stop
Sudden
stop cause
Example
The process when a sudden stop cause occurs during deceleration stop is shown below.
[4] Inputting the stop signal during deceleration
(1) Even if stop is input during deceleration (including automatic deceleration), the
operation will stop at that deceleration speed.
(2) If stop is input during deceleration for OPR, the operation will stop at that
deceleration speed. If input at the creep speed, the operation will stop
immediately.
(3) If a stop cause, designated for sudden stop, occurs during deceleration, the
sudden stop process will start from that point.
The sudden stop process during deceleration is carried out only when the
sudden stop time is shorter than the deceleration stop time.
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