Safety functions 187
Step Description
1 The SDI positive request is received (for example, from the I/O) and the FSO starts the
SDI monitoring. The SDI active indication goes on. The motor rotates to the correct
direction (in this case, positive).
2 The motor stops.
3 The motor starts to rotate again (into the positive direction).
4 The rotation direction of the motor changes to the forbidden (negative) direction. The
FSO locks the SDI tolerance limit degree (A) into its current position.
5 The motor stops before the SDI tolerance limit (A) is reached.
6 The motor starts to rotate again (into the positive direction).
7 The motor continues to rotate to the correct direction and the SDI tolerance limit degree
(A) is update to its original value.
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