After long work, the redPlc nodes are finished. 
With this nodes you can realize automation tasks in Node-Red.
The control logic is realized as Ladder-Logic (LD) according standard IEC 61131-3.
Many hardware module nodes are in test phase and I publish this
next week (GPIO, I/O Expander, Adc, piFace ..).
My next steps:
Add analog Ladder-Logic nodes to redPlc.
Add more Ladder-Logic examples.
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