Cause : PZD configuration error comes when the configuration of the process data (PZD) for the USS protocol is incorrect.

Alarm value (r2124, interpret decimal):

2: PZD amount (p2022) too great for the first drive object (p978[0]).
The number of possible PZD items in a drive object is determined by the number of indices in r2050/p2051.

Re alarm value = 2: Check the amount of USS PZD (p2022) and the maximum PZD amount (r2050/p2051) for the first drive object (p0978[0]).