Function library
7-65
L
EDSVS9332P-D21 EN 3.0
7.5.9.7 Target window (POS-WAITSTATE)
Purpose
Particularly high demands on the accuracy of TARGET-REACHED MESSAGE.
Function
With the input POS-WAITSTATE the target-reached message can be
(E 7-64)
decelerated until the
drive has exactly reached the target.
The program will not be processed until
•
the position setpoint POS-SETPOS has reached the target and
•
the input POS-WAITSTATE = LOW.
CTRL
POS-IN-TARGET
POS-WAITSTATE
POS
C1361/22
C1360/22
MONIT
POS-POUT
MONIT-P15
C1220/4
C1218/2
C1221/4
Fig. 7-30 Connect output MONIT-P15 with input POS-WAITSTATE
Output
Level Description
POS-WAITS
TATE
HIGH POS-IN-TARGET is not set yet since the current positioning is still running. The functions of the next PS are not carried
out yet.
LOW Continuation of the program:
The program is continued only once the difference between actual value a nd setpoint is compensated such that the
difference is within the permissible follo wing error tolerance.
Under code C1218/2 you can enter a following error with less tolerance.
MONIT-P15
HIGH Display when the momentary following error is higher than the target window.
The output MONIT-P15 will be switched even if the second follo wing error monitoring is switched
off.
Tip!
Due to highly dynamic acceleration processes the system may deviate to such an extent that the
setpoint reaches the target position before the actual value. Continuing the program processing
immediately would be faulty and have a negative effect on the following processes.
These drive tasks can be solved by decelerating the program continuation within a small target
window (POS-WAITSTATE = HIGH) until the actual position value is really situated in the target
window. The target window is defined as very narrow by the code C1218/2 (second following error
tolerance). In order to continue the program processing later on, the system deviation called
following error must be lower than the target window defined before.
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