Machine Data and Incremental Dimensions
8-17
FM 351 Positioning Module
C79000-G7076-C351-02
Address Name Type Initial Value Comment
40.0 BAUDRATE DINT L#0 Baud rate:
Range of values:
0 = 188 kHz
1 = 375 kHz
2 = 750 kHz
3 = 1500 kHz
With the baud rate machine data, you define the speed of the data transfer from SSI encoders to the
FM 351.
This entry has no significance for incremental encoders.
The maximum baud rate depends on the cable length:
• 200 m 188 kHz
• 100 m 375 kHz
• 40 m 750 kHz
• 12 m 1500 kHz
Address Name Type Initial Value Comment
59.0 CNT_DIR BOOL FALSE Count direction:
0 = normal
1 = inverted
With the machine data “count direction”, you match the direction of the position detection to the direction
of axis movement.
You must also take into account all the directions of rotation of the transmission elements (for example
coupling and gearing).
• Normal = ascending count pulses (incremental encoder) or encoder values (absolute encoder)
correspond to ascending actual position values
• Inverted = ascending count pulses (incremental encoder) or encoder values (absolute encoder)
correspond to descending actual position values.
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