Siemens SIMATIC S7-300 Manual page 241

Table 9-11
15
19.0
20
20.1
20.3
MSR stands for measurement system raster (see Section 5.3.1)
Sample encoder Encoder:
adjustment
Machine axis design:
From this one can calculate the following traversing distance per encoder
revolution:
Gear ratio: i =
Displacement per
encoder revolution =
The following values are entered:
Note
The encoder covers an absolute traversing distance of 256 16,666.666...
MSR. In the 10
mum axis traversing distance of 4,266.666... mm.
FM 354 Servo Drive Positioning Module
Function parameters – Absolute encoders (SSI), continued
MD Designation
SSI baud rate 1 = 78,000 Baud
2 = 156,000 Baud
3 = 312,000 Baud
4 = 625,000 Baud
5 = 1,250,000 Baud
Direction adjust- 1 = invert measured value direc-
ment tion
Hardware moni-
toring
1 = Error in absolute encoder
1 = Voltage monitoring
Number of increments per revolution (MD13) = 4096 = 2
Number of revolutions (MD14) = 256 = 2
Motor with 50:30 gear ratio on spindle with 10 mm pitch = 10,000 MSR
Encoder on motor.
MD
11
12 0.666... 2
13
14
–3
mm system of measurement this corresponds to a maxi-
Description of Functions
Value/Meaning
50 spindle revolutions
30 motor revolutions
i 10,000 MSR = 16,666.666... MSR
Value
16 666
32
= 2,863,311,530 (2
4096
256
Comments/Unit
(Code number)
The baud rate de-
pends on the cable
length between FM
354 and encoder
–
Entry for monitor-
ing to be switched
on
12
8
= 1.666666...
Unit
–3
(10 mm)
–32
10–3 mm)
(puls/rev)
(rev)
9-65