How many adresses can I have connected to many S7 plc\'s ?

[fmulder]

Hi,

I'm working on a project with many PLC's and many adresses towards WinCC OA. I calculate that we'll have to configure 530.000 S7 adress configs. I'm now trying to work out the number of servers that i should have.
I could make a wild guess and say that I'd like a maximum of 50.000 S7 adresses on one WinCC Oa server. This would mean that I'd need to split up my application onto 11 servers. But I could just as easily assume 10.000 and then take just 5 ?

Is there anyone that has encountered similar large numbers. What was your maximum amount of S7 adresses ( an adress config for one variabele in an S7 PLC) on one WinCC Oa server ? Or, what is a good maximum number of S7 adresses on one server ?

Thanks for your feedback

p.s.
Of course, we want to achieve a number where our servers starts up good, switches redundancy good and feels good in general. We feel that 530.000 adresses on one WInCC OA server will lead to a monster that hardly starts up and that will hard to manage.

[leoknipp]

Hello Frenk,

I do not know the maximum number of I/Os configured in a single project.
Only the number of I/Os does not give an indication of the project size, how long it will take to start it up and how it will react during runtime.

For the calculation of the project size and the decision which hardware you have to choose you have to take into account also the following parameters:
-- rate of value changes for those elements (very important)
-- number of additional elements for a single I/O, e.g. compress structure for values calculated by statistical functions
-- number of archived values
-- type of archiving
-- number of dp-elements with alarming

When you know these parameters you can set up a test-system and make a load simulation. Then you know how many I/Os you can use in one system. If the PLC can handle this data then is another task.

Best Regards
Leopold Knipp
Senior Support Specialist