Siemens SIMATIC FM 452, Manual

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Machine Data and Cam Data
8-15
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
8.5 Machine Data of the Encoder
Definition
The encoder supplies position information to the module; the module evaluates this
information taking into account the resolution and calculates an actual value.
You can only be sure that the calculated actual value of the axis position matches
the actual axis position when the information in the machine data of the encoder is
correct.
Data in the Parameter DB
Address Name Type Initial Value Comment
20.0 ENC_TYPE DINT L#1 Encoder type and frame length:
Range of values:
1 = 5 V incremetal
2 = 24 V incremental
3 = SSI 13-bit frame length
4 = SSI 25-bit frame length
5 = listen in
6 = 24 V initiator forwards
7 = 24 V initiator backwards
8 = SSI 13-bit (right-justified)
9 = SSI 25-bit (right-justified)
10 = listen in (right-justified)
With the “frame length”, you specify the clock frame output by the FM 452.
If you select “Listen”, you turn off the clock of the FM 452. The FM 452 can then listen in on other SSI
frames with a 13 or 25-bit frame length. The transmission rate depends on the cycle rate of the
master module.