I'm a complete novice when it comes to PLCs, Ladder Logic, etc. However for reasons that don't matter, I need to create a simple OpenPLC based system to demonstrate the basic principles of Modbus based industrial control systems.
My plan is to run a RasPi based Master unit, controlling one ESP8266 running a temperature sensor, and a second one controlling a small fan that switches on when a set temperature is reached.
The system will be include a HMI (either ScadaBR, or myPRO), and I'll be using NodeRed to capture Modbus messages and send them to another application via JSON.
My question to you OpenPLC gurus is - is the system capable of meeting this requirement:
RaPi Master pulling in temperature data from one ESP, comparing that to a threshold and switching on a fan controlled by a second ESP board, when the threshold is exceeded?