Siemens SIMATIC S7-300 Manual page 193

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) speci-
fied in the machine data.
The axis is thus synchronized (see Section 9.6.3).
The override is set to 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 refer-
ence-point approach:
16
18
27
28
29
34
MSR stands for measurement system raster (see Section 5.3.1)
Handling by
When an absolute encoder is used, only the reference point coordinate de-
the user
fined as a fixed point on the axis is approached in Reference-point approach
mode.
When an incremental encoder is used, the user has two options for recording
the reference point:
FM 354 Servo Drive Positioning Module
MD Designa-
tion
Reference- –1,000,000,000...+1,000,000,000
point coor-
dinate
Type of ref- 0 = direction +, zero pulse right
erence- 1 = direction +, zero pulse left
point ap- 2 = direction –, zero pulse right
proach 3 = direction –, zero pulse left
4 = direction +, RPS center
5 = direction –, RPS center
8 = direction +, RPS edge
9 = direction –, RPS edge
Reference- –1,000,000,000...+1,000,000,000
point shift
Referencing 10...v (MD23)
max
speed
Reducing 10...x (see Machine data list, Table 5-5)
speed
Inputs 5 = reference point switch for
reference point approach
6 = reversing switch for reference point approach
with connected reference-point switch (RPS)
without connected reference-point switch (RPS).
Description of Functions
Value/Meaning Comments/
Unit
(MSR)
(MSR)
(MSR/min)
(MSR/min)
Assigned de-
pending
on input
9-17