@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/