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6. APPLICATION FUNCTIONS
6.24.3 Fast start operation
Using the fast start operation signal (FST) as a substitute of the start operation signal (ST) shortens the time
required for the second and subsequent start operations.
required for the second and subsequent start operations.
POINT
The fast start operation cannot be used in JOG operation. Use the start
operation signal (ST).
(1) High response start operation using the fast start operation signal (FST)
In the start operation, the user program turns on the fast start operation signal (FST) as a substitute of the
start operation signal (ST). On receiving the fast start operation signal (FST), the position board turns off
the signal (FST), and operation is started.
start operation signal (ST). On receiving the fast start operation signal (FST), the position board turns off
the signal (FST), and operation is started.
Command speed
Fast start operation
(FST)
(FST)
ON
OFF
OFF
During operation
(OP)
(OP)
About one control cycle at shortest
Position board is
turned off.
turned off.
ON
OFF
OFF
(2) Conventional start operation using the start operation signal (ST)
In the conventional start operation, the next start operation cannot be performed until the start up
acceptance complete signal (STO) is turned off by turning off the start operation signal (ST). Therefore, the
start operation signal (ST) must be turned off before the next start operation. This procedure, when
performed after operation is completed, delays the start operation by about one control cycle until the start
up acceptance complete signal (STO) is turned off. In addition, when the start operation signal (ST) is
turned off in operation, the start up acceptance complete signal (STO) is off after operation is completed,
which provides the same responsiveness as in the start operation using the fast start operation signal (FST).
acceptance complete signal (STO) is turned off by turning off the start operation signal (ST). Therefore, the
start operation signal (ST) must be turned off before the next start operation. This procedure, when
performed after operation is completed, delays the start operation by about one control cycle until the start
up acceptance complete signal (STO) is turned off. In addition, when the start operation signal (ST) is
turned off in operation, the start up acceptance complete signal (STO) is off after operation is completed,
which provides the same responsiveness as in the start operation using the fast start operation signal (FST).
Command speed
Start operation (ST)
Start up acceptance
complete (STO)
complete (STO)
During operation (OP)
About two control cycles at shortest
ON
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
ON
OFF