Thanks for the reply. Presently my memory load is as following.
Load Memory RAM: 85%
Work Memory code: 63%
Work Memory Data: 21%
Now I have some more extension of program with the spare IO connected on the same CPU. I have 20% spare IO with this CPU which I cant utilise with by extending new program due to memory load.
If you have any experiance of set up additional CPU with existing CPU to reduce load of existing one, then please guide me how to do it.