Siemens SIMATIC FM 353 - Page 288

Writing Traversing Programs
10-6
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Set actual value on-the-fly G87, G88, G89
The “Set actual value on-the-fly” function is programmed and triggered by a digital
input; the block change occurs on the fly and the actual value is set to a new di-
mension (programmed coordinate) at the same time. The digital input must be
parameterized with the “Set actual value on-the-fly” function by way of machine
data item MD34.
Example of set actual value on-the-fly
The following figures show the program structure, program flow and actual-value
curve for an example of “Set actual value on-the-fly.”
/ N
G1
G2 G3 X/t F M1
M2
M3 D
400 00010 90
15
20
25
50
300
400
200 000
400 000
400 000
89 (88)
90
87
100
Í
V
t
I
N10 N15 N20 N25
t
Reversal of direc-
tion
0 50 100 150 200 250 300 350 400
0
50 100 150 200 250 300 350 400
X
X
System of measure-
ment normal
I
N15N10 N25
N20
System of
measurement
shifted
I − digital input