Siemens SIMATIC FM 452, Руководство пользователя

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Machine Data and Cam Data
8-18
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
Address Name Type Initial Value Comment
36.0 NO_REV DINT L#1024 Number of encoder revolutions:
Range of values:
1 (single-turn encoder)
2 to 2
19
(multi-turn encoder)
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): 2 ... 4096 in powers of 2.
Multi-turn / Listen-in (right-justified): 2 ... 2
19
All values with the following restriction:
Increment/encoder revolution number of encoder revolutions
≤
2
25
.
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 Type Initial Value Comment
40.0 BAUDRATE DINT L#0 Baudrate:
Range of values: 0 = 125 kHz
1 = 250 kHz
2 = 500 kHz
3 = 1000 kHz
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