打开事件帮助，有如下提示，我把DP电缆及接头重新压接了一下，问题依旧。

The DP station with the station number listed in the detailed information has failed (event 39C4) / is operational again (event 38C4).
Possible causes:

· The DP station was switched off/on.
To correct or avoid errors:
Check the status of the DP station.

The cable to the DP station was disconnected/connected.
To correct or avoid errors:
Check the cable to the DP station.