发布于 2007-02-07 19:59:49
0楼
Programming Error (OB121)
The operating system of the CPU calls OB121 when a programming error occurs, for example:
Addressed timers do not exist.
A called block is not loaded.
持外,从站丢失也会引起系统发出同样的报警。
应该是PC STATION 组态或PLC站的定义有问题。
知其道,用其妙!