Siemens SIMATIC FM 453, Manual

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10-19
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
Machine data can specify the output time for M functions:
S
M function is output before or after positioning with a block change
M function output and positioning proceed in alternation.
– M function output before positioning causes exact-positioning re-
sponse in the preceding block.
– M function output after positioning causes exact-positioning response
within the block.
S
M function is output during positioning
M function output and positioning proceed simultaneously.
The following figure shows a sample program with M function output
“during positioning”.
/ N G1 G2 G3 X/t F M1 M2 M3 D
100 00 10 10 000
10
90
40
97
5
15
20 60
20 000
30 000
40 000
200 00
150 00
20
30
V
X
N5 N10 N15
N20
10 000 20 000
30 000 40 000
10 20 30 40 97
M No.
1 - Output of M10 is not position-dependent, since no relevant position for
a position-dependent M function is present.
2 – At the block change from N5 to N10, output is prepared. Output of the
M function does not proceed until the actual position has reached the
programmed position of N5.
3 – If two M functions are programmed in a traversing block, the first
M function is output depending on position, followed by the second
M function.
4 – The change signal for M97 or M98 is output with the G64 block
transition (digital output) if the actual position has reached the
programmed position of the block. The actual position runs behind
the set position (difference = overtravel).
1
2
3
4
Influence of
M Function on
Block Change
On-the-fly
Writing Traversing Programs