cantcliff Posted January 21, 2015 Report Share Posted January 21, 2015 We use several workstations that may, or may not be, running at any given time. How well does the CANbus protocols handle a node being offline? Quote Link to comment Share on other sites More sharing options...
AlexUT Posted January 21, 2015 Report Share Posted January 21, 2015 Hi, Can you provide more detailed question? What CANBUS protocol do you mean? What will be connected to Unitronics PLCs - Unitronics PLCs or 3rd party devices? Then answer will be more detailed. B.R. Quote Link to comment Share on other sites More sharing options...
cantcliff Posted January 21, 2015 Author Report Share Posted January 21, 2015 At this point all Unitronics PLCs. We have several workstations in a cell, but they are not all powered up at the same time. Some may be powered on, or shut down, during the shift. Would inter-PLC communication run into issues with a node entering or leaving the network? Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted February 8, 2015 MVP 2023 Report Share Posted February 8, 2015 CANbus is very tolerant of nodes dropping off and entering the network. Obviously disconnecting the wires would cause a problem, but other than that it doesn't care. Your code should check the health of the destination PLC before you send anything to it. I usually put a routine with a "Check Alive" function block in all PLCs on the CANbus network along with indicators on a screen to watch the individual node statuses (statii?). The best way to answer your question is to build it and then start powering nodes down at a time when you won't break something or kill someone if something goes awry. Joe T. Quote Link to comment Share on other sites More sharing options...
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