cmarcus Posted March 7, 2017 Report Share Posted March 7, 2017 Hi, I have a customer that is looking to use a Unitronics PLC to add additional outputs to their existing system. The main system runs on a .net application, so the PLC would be mainly used to set/reset a MB or Output at a particular time. The response time needs to be pretty fast, likely a few milliseconds from PC send to output state change. Which communication method would be the fastest or would they be roughly the same? - PCOM - .NET driver - Custom protocol with short command sent from PC and received via FB protocol scan. Just getting a feel on how I should build the PLC communications class. Thanks, Quote Link to comment Share on other sites More sharing options...
Saragani Posted March 7, 2017 Report Share Posted March 7, 2017 the .Net driver implements the PCOM. There is a little overhead of the fact that it is written in .Net (Ctor, GC, JIT compilation, threads and locks), so I can't give you an accurate time on how much it takes to send a message to the PLC (Assuming you already established a connection to the PLC). It also depends on the channel (Serial or Ethernet, and if Ethernet then also the distance between the PC and PLC). Modbus is also a fast protocol. Quote Link to comment Share on other sites More sharing options...
cmarcus Posted March 9, 2017 Author Report Share Posted March 9, 2017 Ok that makes sense. Thank you very much! Quote Link to comment Share on other sites More sharing options...
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