Ok, The real issue here was the KSD16 on axis 5 was malfunctioned not long after mastering, to prove this I had swapped KSD of axis 5 and 6, and as soon as I pressed the dead man switch the error message appeared but this time is "ackn. A6 without power".
It is all fine now.
I have the same problem,
When I swap the ksd, I have to just swap the two power cable or also the rj45 cable between ksd?
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