As one of the five programming languages defined by the IEC 61131-3 standard, our HMI+PLC (HMC) and PLC (MLC) configuration software MAPware-7000 supports the Ladder Diagram (LD) editor.
The Ladder Diagram editor uses the same programming paradigm as the Native Ladder editor. It is a graphic editor in which instructions are placed in a pseudo electromechanical circuit. Instructions are activated by connecting them to the power rail of the circuit. Boolean operators are modeled as relay contacts and coils.
Contacts can be arranged to block or allow power to flow from the power rail to downstream instructions based on the needs of the application. Coil instructions are activated when the circuit is on a logical state that allows power to flow to them.