7. POSITIONING CONTROL
7
−
70
(b) The sequence program sets the travel value in the travel value change data
register while speed control is in progress. When the external CHANGE
signal turns ON, the contents of the travel value change data register are
set as the travel value.
V
Travel value change data
register
t
Travel value
change
possible
ON
OFF
Speed control Position control
P
1
P
2
P
3
P
is set as the travel value
CHANGE signal input from
external source
2
(5) Travel value area after proximity dog turns ON
The travel value since the position mode was selected by the external
CHANGE signal is stored in the travel value area (see section 3.4.1) when the
proximity dog turns ON.
[Cautions]
(1) Items checked when the external CHANGE signal turns ON
Speed control switches to position control when the external CHANGE signal
turns ON if the following conditions are met:
•
The start accept flag (M2001+n) is ON.
•
Speed control is in progress after start of speed/position switching control.
•
Speed/position switching enable signal (M1805+20n) is ON.
(2) To omit speed control
Position control only is executed if M1805+20n and the CHANGE signal are ON
when control starts. The speed control signal (M1604+20n) does not turn ON.
V
Speed/position switching flag
(M1805+20n)
t
ON
OFF
OFF
ON
OFF
OFF
OFF
ON
Position control only if M1805+20n and
CHANGE are ON at start
Speed/position switching signal
(CHANGE)
Speed control in progress
(M1604+20n)
Speed/position switching latch
(M1605+20n)
SVST instruction
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