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One of the possible causes for a Sercos Exception error as shown below is the inability of the Sercos loop to come up healthy prior to configuring the axes.
Motion error detected by defaultErrorHandler():
Error: SERCOS_EXCEPTION(1002): Unknown Sercos error: 0x71ff
Command: Invalid value(3)
Axis Id: 0
Task Id: 150
This could mean one or more of the following:
1. Address of the devices in the Sercos loop set incorrectly.
2. Duplicate address on two or more of the devices in the Sercos loop.
3. Transmit and Receive of the fiber optic cable connected incorrectly.