@redplc/node-red-redplc


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



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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 from other nodes.
- export: Export Data to other nodes.

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/