The first question would have to be - why do want to do it? If the data already exists in one location that is accessible by all parts of the program, why are you going to use up more PLC memory with exactly the same data?
The PLC languages themselves are fairly similar between different manufacturers. You basically have ladder logic (which looks like a relay contact map), function blocks (which are more akin to an electronic circuit overview) and structured language (of which there are several variants. Most look a lot like high-level programming languages). You might encounter some functions having different names or in-/outputs between manufacturers but most of them look much the same.
Always the top brands will be the most popular and over many years it is my opinion that this is because of their marketing strategy, history, reputation and worldwide acceptance more than any other reasons. This does not mean they are better or worse in any way, just means they are more accepted world wide and more people are experienced with their software. Thus there is some security for the owner in respect to programmer support or future resources etc (people come, people go) and a basis on which management may dictate what hardware is used. There is also the consideration on the capital outlay for programming software which can be very expensive.
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In Discussion
Synchronous induction motors - do you still use them?
Rating of VCB and Relay panel
One percent unbalance in Voltage leads to unbalance of 10% current in motor
We are looking for a good information about screw pump.
Solar PV Farms 1 MW to 50 MW - Investment Capital
PLCs vs. RTUs -- What's the difference?
Reduction of Total Suspended Solids (fine solids) in Produced Water?
Advantages and disadvantages of having STAR/STAR 110/11kv transformer
Rating of VCB and Relay panel
One percent unbalance in Voltage leads to unbalance of 10% current in motor
We are looking for a good information about screw pump.
Solar PV Farms 1 MW to 50 MW - Investment Capital
PLCs vs. RTUs -- What's the difference?
Reduction of Total Suspended Solids (fine solids) in Produced Water?
Advantages and disadvantages of having STAR/STAR 110/11kv transformer
