ainfirdaus
OpenPLC is great.

Mr, in my industry, PLCs have IO modular, for example DO module, DI module, AI module, AO module, and module for sensors like thermocouple. Will you make slave modular IO concept?

As comparation, you can visit http://www.outseal.com plc based on arduino made by Indonesian. It has modular IO using I2C and I hope OpenPLC so.

Thank you

Firdaus from Indonesia
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thiagoralves
It is modular. Just add more slave devices. You can add as many Arduinos, ESP8266, Sonoff, etc as you want. Also buy any industrial hardware that can talk Modbus, and add it to OpenPLC using the slave devices menu.
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ainfirdaus
So, I can use 2 arduino with one host? And how to set the address?
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thiagoralves
Yes. Just add two at the slave devices web page. The addressing is cumulative, which means that the addresses for the second device starts where the address of the first one ended. Take a look at the esp8266 example:  https://www.openplcproject.com/getting-started-esp8266 (just scroll down to "Add a Slave Device to OpenPLC")
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ainfirdaus
Thanks for your answer
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