Description of Functions
9-21
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
When crossing the RPS, a signal length of ∆t 2FM cycle must be assured!
The following table shows you the exact location of the synchronization point on
the current-sourcing pattern zero or zero pulse external.
Synchronization point encoder Selec-
tion in MD37
Applicable for type (0 − 3) of the refer-
ence point approach per MD18
Current-sourcing pattern zero
RPS
V
R
Zero pulse external (NIX)
RPS
V
R
NIX
Center
Using a reversing switch
If it is possible for the axis to be “behind” the reference point switch when you start
reference point approach, a reversing switch can be installed at the end of the axis
in the approach direction, in order to reverse the axis in the direction of the refer-
ence point switch.
On axis movements with referencing feed, a signal length of ∆t 2FM
cycle must be assured for the reversing switch!
Example
Approach direction from MD18
Reversing
switch
Emergency
limit switch
Reference point
Axis position
RPS
The value for the reference-point shift (MD27) is traveled after the synchronization
point is reached.
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