@redplc/node-red-redplc

redPlc Node-Red nodes for the realization of Software-PLC with Ladder-Logic according to IEC 61131-3.

Nodes

• contact: Ladder Logic Contact.
• coil: Ladder Logic Coil.
• function: Ladder Logic Digital Function.
• counter: Ladder Logic Counter Coil.
• timer: Ladder Logic Timer Coil.
• flipflop: Ladder Logic FlipFlop.
• move: Ladder Logic Move.
• math: Ladder Logic Calculation.
• scale: Ladder Logic Scale.
• compare: Ladder Logic Compare.
• M memory: Digital (M) Memory Variable.
• MA memory: Analog (MA) Memory Variable.
• s-inject: Sequential Inject.
• onstart: Execute On Start.
• firstscan: Execute On First Scan.
• rail: Ladder Logic Rail.
• import: Import Data.
• export: Export Data.

Detail

redPlc nodes implements Software PLC functionality in Node-Red. The control logic is realized as ladder logic (LD) according standard IEC 61131-3. Variables are stored in Node-Red global context memory as arrays:

|Variable|Function|Array Of|Created by| |---|---|---|---| |I|Digital Input|Boolean|Digital Input Modules| |Q|Digital Output|Boolean|Digital Output Modules| |M|Digital Memory|Boolean|Memory Node| |C|Counter|Boolean/Number|Counter Node| |T|Timer|Boolean/Number|Timer Node| |FF|Flip-Flop|Boolean|Flip-Flop Node| |IA|Analog Input|Number|Analog Input Modules| |QA|Analog Output|Number|Analog Output Modules| |MA|Analog Memory|Number|Memory Node|

More info and examples: https://github.com/redplc/redplc/