RickL Posted April 2 Report Share Posted April 2 in prima facie I'm in the early stages of laying out the design logic tree and required protocols for a dedicated "self-extrication" elevator PLC unit. This is companion project to my PLC based primary elevator controller. The normally idle, stand alone, self-extrication PLC is will be in "hot-standby" mode with battery back-up operation. I'll need to establish a communication link between these two PLCs. I'll need more than just a "heart beat" failure indication of the main PLC controller, thinking to possibly emulate a "catch/throw" error paradigm with-in the main controller to the cause of the controller/peripheral failure. Here the extrication PLC would weigh the best course of action. Quote Link to comment Share on other sites More sharing options...
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