Determining The Position - Siemens SIMATIC FM 353 Manual

9.6

Determining the position

Overview
The FM 353 operates without encoders.
The position resolution of the axis is determined by the traversing distance of one
motor increment.
The control frequency pulses emitted by the FM 353 are added internally to form a
position value.
Function parameters
The following table shows you how to adapt a stepper motor to the FM 353.
MD
11 Distance/motor revolution
(division period)
12 Residual distance/motor
revolution (division period)
13 Increments/motor revolu-
tion
(division period)
1) see Section 5.3.1, Dependencies
MSR stands for measurement system raster (see Section 5.3.1)
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Designation
1...1 000 000 000
1)
0...2
1)
1
2 ...2
1)
Description of Functions
Value/Meaning
32
−1
25
Comments/Unit
[MSR]
(integer component)
−32
[2 MSR]
(fractional compo-
nent)
Entry per stepper
motor data plate
9-63