Hello @dhg ,
yes, as mentioned in the forum entry https://developer.community.boschrexroth.com/t5/ctrlX-SAFETY/SAFEX-C-as-FSoE-master-and-EtherCAT-slave/m-p/70756#M165
the introduction of FSoE-Slaves to the FSoE-Master functionality or the activation of FSoE-Slave changes the population of the FSoE-Slots in the EtherCAT configuration of the SAFEX-C.1x device. If the EtherCAT configuration on the EtherCAT-Master does not match to it, you get the "0x001E: Invalid Input Configuration" error.
Best regards
Your ctrlX SAFETY Team
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