GE IC200MDD844F

串行连接暂停

导致一个RTU设备暂停的唯--原因是当一个信息正在被接收时发生一个四字符周期的数据流中断。如果这种情况发生，认为该信息被终止并且不再向主设备发送响应。有几个由应该被主设备重视的从设备的特征引起的时序因素。在发送一个查询信息后，在从设备不响应请求之前，主设备应该为从设备翻转等待一个适当的时间。从设备翻转时间受控制器通讯窗口时间和CPU扫描时间的影响。

无效事务

如果在传送期间发生-一个不属于无效查询信息或串行连接暂停类别的错误，该错误就被认为是无效事务。导致-一个无效事务的错误类型包括:Bad CRC.

■由存储器地址字段指定的数据长度比接收的数据更长。

成帧或运转超限错误

■奇偶错误

如果一个信息被从串口接收时此类别的错误发生，从设备不会返回一个错误信息;从设备忽略引入的信息，处理为好象该信息不是提供给它的。

故障定位变量特性

上电时，PLC内的所有故障定位变量清0。有故障时，PLC将受影响的变量进行状态转

换。在下列动作之一发生之前， 故障变量保持故障状态:

●通过编程软件清除故障表或者清除整个存储器时，PLC故障表和I/0故障表清空。

●相关设备(机架，I/0模块或者Genius设备)重新增加到系统中。故障表中记录了”Addition of. . ."故障时，PLC会将与这个设备相关的故障变量设定到无故障状态。在另一个与这个设备相关的故障发生之前，故障变量保持无故障状态。(对于分布式I/0故障，特别是总线控制器重启时，这可能花费几秒钟的时间)

注意:这些故障变 量只用于信息显示。不用于验证I/O数据的功能。I/O 点故障变量(14-3页描述)可能用于验证/O数据。PLC为故障状态设定故障定位变量时不会停止执行。

故障变量叠加的影响。如果第5机架，第6槽，总线1,模块29发生故障，则如下故障变量会被置位: RACK_ _05, SLOT_ 0506, BUS_ _05061 和M_ 5061029。 故障表中只有1条故障信息来描述这个模块的故障。这种情况下，故障表不会分别描述机架，槽和总线故障。

如果一个模拟量基块(IC697ALG230)丢失，这个模块的故障变量置位。这个模块丢失后，他的扩展模块(IC697AL G440和ALG441)的故障变量不会置位。因此，扩展模块的故障定位变量置位前，会参考他的基块是否发生故障。

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