Siemens SIMATIC FM 453 Manual page 291

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