Sounds like a homework question.

You need to get a PLC that is:-

widely supported locally or else you're stuck with the one company (to make any changes).

a current model (with software, cables, displays etc available locally).

much bigger than you need now (projects always grow)

rated for your project (if it's 24V output but all your stuff is 240V it'll cost a lot to interface).

1.- First, you need to specify a separate and dedicated controller for monitoring the burner, in order to comply with safety requirements. Then ask for self diagnostic indicator lights and reset buttons to clear faults (or you might prefer a single operator interface).

2.- Ask for a non obsolete PLC that you already have the software & cables for; or ask for the software licence included in the price; so your tech staff can service and/or modify it.

3.-Ease of operation, no fancy and unnecesary features.

Yahlasit

I think the first question that should be asked is,

What is the rotary kiln going to be used for, cement, DRI, calcination, pelletization, reheat, etc.?

What components are being placed on the kiln, burners, fans, thermocouples, rotary valves, etc.?

What alarm systems are being considered and for what, speed control(rpm), shell temperatures, gas analyses, burner(s) safeties, kiln travel, kiln and tire rotation(OR), kiln seals?

What type of kiln electrics and bus are being considered, and will there be automated bus cleaning system?

What process controls are going to be considered? Is the process automated for production, temperature, mixtures, chemistry, etc.?

Is the PLC for equipment safety only, inclusive for process control, inclusive for personnel safety, to meet Indian codes, etc.?

Sort of need to know-get some information before we can give you a realistic answer.

Tom

Don't forget K.I.S.S! The simpler the better. THis will save maintenance costs as well if your in-house staff can easily understand and service. Get your maintenance tech(s) to "lean-over-the-shoulder-of" your integrator during implementation to sponge up all he/she can.

All very good points!!!

The primary control algorithms for a rotary kiln are PID process algorithms, not discrete control.

Hence, you should probably consider the current crop of PACs (Process Automation Controllers) or Hybrid Controllers (two terms for the same thing) - controllers that look like PLCs (rack mount, CPU, P/S, modular I/O, communication) but are designed first for process control, second for discrete control.

Any of the commercial units have their own HMI panels or can talk to an OPC server for HMI, SCADA or an historian.

Make sure your controller has a COM protocol that can be interfaced to OPC, so that your data doesn't get stranded "on the rotary island", but can be distributed as needed.

Depending on shell temperature, the new crop of wireless temperature transmitters might survive with some shielding, on a stand-off from your shell, providing actual shell temperatures.
Depending on what you're loading, non-contact radar and non-contact IR temp sensing have proven their value on a couple rotaries that I've dealt with.