KUKA Error Message 1504 Invalid SYNACT variable <variable name> <block number>

KUKA Robot Error Code 1504 Invalid SYNACT variable <variable name> <block number>
Cause – In logical comparison of value assignments during cyclic Synact monitoring, an error occurred when accessing a variable, e.g. variable write-protected.
Monitor – Cyclic.
Effect – Ramp-down braking, all active commands inhibited.
Remedy – Correct the data or the program.
– Acknowledge the message.


KUKA Error Message 1504 Invalid SYNACT variable <variable name> <block number>