I would like to know the packet size of a OPC data on the network. What is the general bandwidth required when around 2000 odd OPC tags/data are transferred over the net?

Regards

 

OPC uses Windows DCOM as its transport mechanism. It has a lot of overhead compared to fieldbus and industrial Ethernet protocols. You definitely need 10 Mbit/s or preferably 100 Mbtit/s Ethernet. OPC is fast enough for
operator visualization but I would not use it as part of a control loop.

Jonas Berge
SMAR
===========
[email protected]
www.smar.com
Learn fieldbus and industrial Ethernet at your own pace:
www.isa.org/fieldbuses

 

It depends on what protocol, and the Hardware link you are talking about.The packet size is decided by the lower linksl layer.

Sometimes even the hardware link being the same e.g. IEEE802.3 or RS485 or RS232C the Packet size may differ withing each type depending on the designed protocol. So lets fix the type first.

I guess OPC would be something like IPC (Inter process communication)making two application talking to each other on a set rules,and not application level or data structure and packet level.