I can connect to a SAFEX-C12 without issue following a power up.
If I disconnect, then try to reconnected, It reports 'Wrong serial number for verification' in the Message Window.
If I cycle the power to the SAFEX-C12, I can then connect again without issue.
I have this issue when I connecting with USB cabele or over EtherCAT via the ctrlX Core.
ctrlX SAFETY Engineering version 1.7.6.9968
SAFEX-C12 firmware version 1.0.1.29, FPGA version 211