How to undestand PLC program capacity

[_Pavel_]

Hello All,

I used CJ2 PLCs where program capcity is given in Ksteps. After few projects when ROM was unexpectedly over, I have cought, that 5Ksteps is too little and say 20Ksteps is enough.

Now I'm selecting NJ PLC where it's given in Mbytes of program memory. So 3MB of program memory - is it much or few? How to compare Ksteps and Mbytes of program memory?

Thanx!

Edited April 29, 2017 by _Pavel_

[Crossbow]

I'd swear I have seen a guideline on this somewhere but can't locate it at the moment, if I find it I will reply again with details.

[Michael Walsh]

An Omron engineer did some testing on this and determined that 1.5 MB of program memory in an NX1P (same family of controllers) is roughly equivalent to 100k steps on a CJ2H processor.  If I can find more info or specifics on NJ testing, I will add to the discussion.

 

[_Pavel_]

Thanks for the replies!

I"ve been searching myself as well and I've just found here

https://www.ia.omron.com/products/family/3111/specification.html

5 MB  (100 KS)