UDS,MES,OPC ,xMII servers?

[HariCS23]

Hi Gurus,

I am little confused about positioning for these servers in any landscape.

Any body please explain about these severs and the sequence of where to subscribe these servers.

what i know ( may be incorrect ) : xmii uses specific uds to connect MES system (ihistorian for example ) .MES uses opc driver or server to communicate with plc's to collect data.

Please help.

Thanks

Vansi

[Former Member]

Hi Vansi,

OPC is a communication standard. Equipment such as a PLC or a DCS may have a corresponding OPC Server (providied by equipment vendor or provided by third-party). OPC Server allows an external system to communicate via the OPC standard. The OPC server communicates with the PLC / DCS in a proprietary language.

Historians such as iHistorian, can communicate with OPC servers. They may also be able to communicate with the PLC / DCS directly.

One of the possible UDSes for xMII is the OPC UDS. xMII communicates with the UDS in xMII proprietary language. The UDS communicates with the OPC server in OPC standard. The server communicates with the PLC / DCS in its proprietary language.

If you have a Historian in the middle, one possible scenario is as follows:

xMII communicates with the UDS (OPC / OSI PI) in xMII proprietary language. The UDS communicates with the Historian (with appropriate protocol - OPC / OSI PI). The Historian communicates with the OPC server in OPC standard. The OPC server communicates with the PLC / DCS in its proprietary language.

Hope this helps,

Cheers,

Jai.

Edited by: Jai Tamhane on Mar 19, 2008 2:43 PM