BECKHOFF FC5101 - Manual (Page 77)

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The only purpose of this linking is to make it possible for the real-time system to access the FC510x in the cycle
time of the task. The cycle time of the additional task is to be set as follows, depending on the baud rate:
Baud rate Cycle time of the additional task
1 MBaud <= 10 ms
800 kbaud <= 12 ms
500 kbaud <= 20 ms
250 kbaud <= 40 ms
125 kbaud <= 80 ms
100 kbaud <= 100 ms
50 kbaud <= 200 ms
20 kbaud <= 500 ms
10 kbaud <= 1000 ms
The Autostart checkbox is also to be set (see illustration above).