Siemens SIMATIC FM 353, Manual

Page: 219 / 361

Description of Functions
9-19
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
9.2.3 Reference point approach
Overview
In Reference-point approach mode, the direction keys (R+ or R − ) or Start are used
to position the axis to a point (reference-point coordinate MD16) specified in the
machine data.
The axis is thus synchronized (see Section 9.6.1).
The override is set at 100% for the reducing speed.
An active zero offset or Set actual value is reset.
Machine data
The following table lists the machine data that is of significance for reference-point
approach:
MD Designa-
tion
Value/Meaning Comments/
Unit
16 Reference-
point coor-
dinate
− 1,000,000,000 − +1,000,000,000 [MSR]
18 Type of ref-
erence-
point ap-
proach
0 = dir, current-sourcing pattern zero/
zero pulse external, to right of reference point switch
1 = dir, current-sourcing pattern zero/
zero pulse external, to left of reference point switch
2 = direction − , current-sourcing pattern zero/
zero pulse external, to right of reference point switch
3 = direction − , current-sourcing pattern zero/
zero pulse external, to left of reference point switch
4 = dir, reference point switch center
5 = direction − , reference point switch center
8 = direction + , reference point switch edge
9 = direction − , reference point switch edge
27 Reference-
point shift
− 1,000,000,000 − +1,000,000,000 [MSR]
28 Referencing
speed
10 − v
max
(MD23) [MSR/min]
29 Reducing
speed
10 − x (see Machine data list, Table 5-4) [MSR/min]
34 Inputs 5 = reference point switch for
reference point approach
6 = reversing switch for reference point approach
Assigned
depending
on input
MSR stands for measurement system raster (see Section 5.3.1)
Handling by the user
S with connected reference-point switch (RPS).
S without connected reference-point switch (RPS).