The IHMI-PLC incorporates a virtual PLC technology designed to extend HMI software functionality. This includes a stand-alone development system for Windows PC and the virtual PLC-Runtime for Windows PC and CE platforms. Users can program using any mix of three IEC61131-3 programming languages: ST: Structured Text, IL: Instruction List and LD: Ladder Diagram. Using Modbus TCP protocol as an interface, any HMI can access all PLC variables of interest and thus monitor and control the values in registers, coils, digital I/O and analog I/O. The PLC also supports direct-access API for plug-in I/O modules on some CE touch panels.
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