Dear,
I was looking at design requirement it says the following "In normal operation the PLC must control the station. When the PLC fails the RTU must take over control seamlessly"
Practically what does it mean? I understand that all the I/O points will be connected to the PLC and then PLC will communicate to the RTU the alarms.
What they are saying is that looks like I/O are also connected to the RTU without passing by the PLC? does this require configuration that I/O's are connected to both PLC and RTU? I really got confused.
Thanks a lot for any feedback on this issue,
charbel
I was looking at design requirement it says the following "In normal operation the PLC must control the station. When the PLC fails the RTU must take over control seamlessly"
Practically what does it mean? I understand that all the I/O points will be connected to the PLC and then PLC will communicate to the RTU the alarms.
What they are saying is that looks like I/O are also connected to the RTU without passing by the PLC? does this require configuration that I/O's are connected to both PLC and RTU? I really got confused.
Thanks a lot for any feedback on this issue,
charbel