Siemens SIMATIC FM 453, Manual

Page: 291 / 380

9-91
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
The following cases must be distinguished:
Technical Implementation Signal Shape Parameter Definition
Signal encoder on the motor axis
(e.g. initiator) Active phase over several motor incre-
ments, one time per revolution “Zero pulse external”
Cyclical signal generated by the step drive
one time per motor revolution (e.g. zero
trace of a motor-integrated incremental en-
coder) Active phase over one motor increment,
one time per revolution “Current-sourcing pattern
external” and MD53=0
Cyclical one-time signal in current-sourcing
pattern from step drive Active phase in current-sourcing pattern
zero of the step drive, n-times per revo-
lution (n = current-sourcing pattern
number) “Current-sourcing pattern
external” and MD53= n
When the “Zero pulse external” signal is active, the rotation monitoring func-
tion can be implemented (see Section 9.7.3).
The following table shows you the available machine data for parameterizing
the function.
MD Designation Value/Meaning
37 Control signals
37.24 Current-sourcing pattern
zero active 0: Current-sourcing pattern
zero not used
1: Current-sourcing pattern
zero used
Input signal
37.25 Current-sourcing pattern
zero inverted 0: Current-sourcing pattern
zero high active
1: Current-sourcing pattern
zero low active
37.26 Zero pulse external active 0: Zero pulse external not
used
1: Zero pulse external used
37.27 Zero pulse external inverted 0: Zero pulse external high
active
1: Zero pulse external low
active
53 Increment number per cur-
rent-sourcing cycle 4...400
1)
1) Compare documentation from step drive manufacturer.
Description of Functions