GE IC693CPU374-GU通道继电器模块
如果非冗余从设备受到干扰，CI854/CI854A将等待看门狗时间，然后指示从设备的连接断开。线路冗余CI854/CIL854A支持PROFIBUS DP的线路冗余。因此，模块底板TP854上有两个接口“PROFIBUS A”和“PROFIBUS B”。CI854/CI854A上实现了冗余链路模块功能，用于处理PROFIBUS上的数据发送和接收。与任何配置无关，RLM在两条线路上发送数据，并仅通过一条线路接收数据。关于数据的接收，RLM检查从设备是否在两条线路上发送数据以及数据是否有效。将拾取并操作线路A或B上第一个接收到的有效数据。从设备可能在两条线路上并行或仅在一条线路上发送数据。
If the non-redundant slave gets disturbed the CI854/CI854A waits for watchdog
time before connection down will be indicated for the slave.Line Redundancy
The CI854/CI854A supports line redundancy for PROFIBUS DP. Therefore the two
interfaces "PROFIBUS A" and "PROFIBUS B" are available on the baseplates
TP854 of the modules. There is a Redundancy Link Module functionality
implemented on the CI854/CI854A that handles the sending and receiving of data
on the PROFIBUS. Independent of any configuration the RLM sends data on both
lines and receives data only via one line. Regarding the receiving of data the RLM
checks if the slave sent data on both lines and if the data is valid. The first received
valid data on line A or B will be picked up and operated. It is possible that the slave
sends data on both lines in parallel or only on one line.
