Slave count limitation on one Modbus TCP Driver (WCCOAmod)

[deepaktony]

Hi,

We are working on a project using WinCC OA 3.18. There are several Modbus TCP devices present in the project, which we need to configure in different phases. In current phase we have already configured approx. 238 Modbus TCP slave to one Driver (WCCOAmod). Is there any limitation of Modbus TCP Driver for maximum number of slaves? Or we need to add one more Modbus TCP Driver (WCCOAmod) to console after certain count of slaves?


Regards,
Deepak PATEL

[leoknipp]

In the following chapter of the documentation you can the characteristics for every WinCC OA driver:
https://www.winccoa.com/documentation/W ... neral.html

Best Regards
Leopold Knipp
Senior Support Specialist

[gschijndel]

To my knowledge the modbus driver does not have any limit, it is only limited by external factors. So adding another driver does not help with the limitation.

The documentation shows that you are not near the limit yet:

number of the PLC for the driver (0-65535)

[dbindernagel]

On this help page it states under "Recommended/technical limit of connections per driver" = 1.000 with the remark "Technical limit by Operating System Resources", but I'm not sure if this is the relevant number you are looking for.
https://www.winccoa.com/documentation/W ... river.html

[deepaktony]

Thanks dbindernagel and leoknipp ,

I am looking for same link....