系统开始运行正常，后来，偶然出现以下故障，测试连接状态如下：
Link status ds: communications processor not in PROFIBUS ring. Possible cause: PG/PC is only Master at the bus (please check the Setting "PG/PC is the only master on bus" in the Folder Properties-->PROFIBUS). In case of automatic bus profile recognition: The bus profile could not be detected. Please, check your cables and if a server sending bus parameters frames exists in your PROFIBUS/MPI network.
另外，系统提示内容如下：
Data transmission problem of the CP5613/CP5614 !
-> Cause:
a) short circuit on the bus line
b) problems with the bus terminator
c) defect station
d) wrong bus parameters (double station address, TTR is too low, wrong baudrate, ..)
e) other disruptions.
请问是什么问题？？