Siemens SIMATIC FM 452 Manual page 86

Machine Data and Cam Data
Address Name
36.0 NO_REV
The machine data "number of encoder revolutions" is only necessary for absolute encoders. You use it
to define the number of revolutions possible with this encoder. For more information on absolute
encoders, read Section 10.3 in this manual.
Single-turn encoders
Only the value 1 is possible.
Multi-turn encoders
Multi-turn / Listen-in (fir tree):
Multi-turn / Listen-in (right-justified):
Increment/encoder revolution number of encoder revolutions 2
Linear measure
You can also connect a linear measure by entering the value 1.
Total number of steps of the encoder
The total number of steps is not part of the machine data.
Total no. of steps = increments per encoder revolution no. of revolutions
Address Name
40.0 BAUDRATE
With the baudrate machine data, you define the speed of the data transfer from SSI encoders to the
FM 452.
This entry has no significance for incremental encoders.
The maximum cable length depends on the baudrate:
125 kHz 320 m
250 kHz 160 m
500 kHz 63 m
1000 kHz 20 m
8-18
Type Initial Value
DINT L#1024 Number of encoder revolutions:
Range of values:
1 (single-turn encoder)
2 to 2
2 ... 4096 in powers of 2.
19
2 ... 2 All values with the following restriction:
Type Initial Value
DINT L#0 Baudrate:
Range of values: 0 = 125 kHz
Comment
19
(multi-turn encoder)
25
.
Comment
1 = 250 kHz
2 = 500 kHz
3 = 1000 kHz
FM 452 Electronic Cam Controller
C79000-G7076-C452-04