Siemens Siwarex U zeroing problem


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I have application with 4 weighting modules connected to siwarex U modules (7MH4950-2AA01). I use functions SFC58 (WR_REC) and SFC59 (RD_REC)to send commands and read values from siwarex.

Most of time application is running good, but every now and then zeroing command fails (command 3=set scale to zero). In this situation, it doesn't matter how many times i try to run command, scales won't zero. I have gotten over the situation by cycling power off, but that's not a good solution for longer time. What could cause zeroing command not to succeed? is there better ways/ functions for handling Siwarex U functions?