From your description, you want one way control (no feedback from the controlled devices) and there will not be very many commands. Is this a one off project or a product that you are developing? What is your price target? What is your completion date target?

If you want a quick proof of concept prototype, with overnight shipping of off the shelf components and the right programmer, you could have it running by Tuesday afternoon. If you are lucky enough to find a dealer open tomorrow with the units that you need (and a programmer available), you could have your prototype tomorrow.

Note that most of us here supply consumer grade solutions. We are not used to working with products that are truly "industrial grade" that would be appropriate for explosive or corrosive environments. And, there will be strong disclaimers against using our equipment in critical applications such as health care or where public safety is at risk.