jeffs Posted March 18, 2011 Report Share Posted March 18, 2011 I have a system that requires redundant plc control. I have a primary v570 doing all of the control/monitoring and a backup v570 with the exact same program waiting to take over if the primary controller fails. Does anybody have any recommendations on how I should implement this application? This system does not need a 'hot' standby but rather a 'warm' standby that when one controller fails the other takes over. Quote Link to comment Share on other sites More sharing options...
Emil Posted March 21, 2011 Report Share Posted March 21, 2011 Just idea: Connecting controllers in UniCAN. During normal run, the "Master" PLC will send the values of important registers to "waiting" unit". The waiting unit will have its outputs blocked. Controllers will exchange Check alive signals. In case Check alive is lost, the master will block and reset its outputs and the waiting unit will "open" its. When Check alive will return, the main PLC will take the control back. Quote Link to comment Share on other sites More sharing options...
External Moderators Nacho Posted April 4, 2011 External Moderators Report Share Posted April 4, 2011 There are a lot of application with two V120 in canbus working as Emil said. The redundance of inputs and outputs is also possible. Quote Link to comment Share on other sites More sharing options...
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