open controller plc c source code. OpenController is a GPL control application that included both a GUI Ladder Logic application to create a control program and a runtime control engine that will execute the control program in a similar fashion to a PLC. -open controller plc c source code.OpenController is a GPL control application that included both a GUI Ladder Logic application to create a control program and a runtime control engine that will execute the control program in a similar fashion to a PLC. 網上很難下到哦