Unfortunately, there is no such thing as the best PLC. All you will get is opinions.

How much money do you have to spend? Do you want a traditional PLC or a PC-based controller? Do you like good old ladder or do you like IEC 61131.3? Do you need bullet-proof nuclear power plant redundancy, simple chemical plant redundancy .... Can your system be supported locally 24x7 wherever your customers are?

I have yet to find the best PLC. For the day-to-day stuff the S7, Modicon Quantum, Rockwell / A-B ControlLogix to name but three all make the grade.

Good luck.

RA

 

We are a system integrator operating in various fields like Steel, Cement, Oil & Gas etc. We are in process of selecting a make of PLC for our business. For that can anybody send me a list of specifications to be looked at to find the best PLC.

Thanks in advance
Santosh.

 

Unfortunately, there is no such thing as the best PLC. All you will get is opinions.

How much money do you have to spend? Do you want a traditional PLC or a PC-based controller? Do you like good old ladder or do you like IEC 61131.3? Do you need bullet-proof nuclear power plant redundancy, simple chemical plant redundancy .... Can your system be supported locally 24x7 wherever your customers are?

I have yet to find the best PLC. For the day-to-day stuff the S7, Modicon Quantum, Rockwell / A-B ControlLogix to name but three all make the grade.

Good luck.

RA

 

Also, many times the customers will specify the PLC brand as part of the contract.

 

hi ssantosh
i hope you are in india -
all the plc in the market are technically capabel to solve the customer requirement but the question is the acceptance in the market - it varies from region to region
if you take machine tool messung is doing well - it does nt mean other plc are not capable - they are attacting the customer on price and service

if you are specific in process, the system should have good high end plc including redundancy plc/analog modules with good resiolution

find out whether it is acknowledged by leading consultant in process

with regards
ravi
[email protected]

 

I would start much like purchasing a PC. What software do you want to run? In the PLC case, How many I/O points? What type of resolution out of the A/D,D/A? How many segments or different processes at one time? Look for minimum scan time you can live with. COST, this is usually not apparent at first, try to get a software upgrade later, see what that costs. Look at PLCs that handle batch processing in particular.

Best of luck.

 

Dear Mr. ravi,
Myself Kapil from Punjab. From your following message I found that you are at sea in PLC. Since I am going to start my research on "Feasibility of PLC in India", i think that you will not disappoint me in this matter. Can you please state me about the sites of foreign companies providing or researching/trying their hands on PLC in their respective countries.

Appreciating your best help always as a sincere friend.

Thanks & regards,
Kapil Sood
[email protected]