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Kepware Knowledge Base: Solution


Which Client/Server Technologies Does KEPServerEX Support?


Last Update: 2018/11/12
KEPServerEX has been enhanced to provide the widest range of connectivity of any server product available, and includes support to the following client/server technologies:

OPC Data Access (DA) Version 1.0a, 2.0, 2.05a, and 3.0
OPC Alarms and Events (AE) Version 1.10
OPC Unified Architecture (UA) Version 1.01
OPC .NET Service
FastDDE and SuiteLink for Wonderware
DDE Format CF_Text and AdvancedDDE
NIO Interface for iFIX

OPC Data Access (DA)
OPC DA is used to move real-time data from PLCs, DCSs, and other control devices to HMIs and other display clients. The Data Access 3 specification is now a Release Candidate. It leverages earlier versions while improving the browsing capabilities and incorporating XML-DA Schema. OPC Data Access 1.0a was the original specification that the OPC Foundation developed in 1996. Although many of the OPC client applications in use today still support this original specification, OPC Data Access 2.0 enhanced OPC better utilizes the underlying Microsoft COM technology. Most OPC client applications support version 2.0 of the OPC specification. OPC Data Access 3.0 is the latest version of the OPC DA interface.

OPC Alarms and Events (AE)
OPC AE provides alarm and event notifications on demand (in contrast to the continuous data flow of Data Access). These include process alarms, operator actions, informational messages, and tracking/auditing messages.

OPC Unified Architecture (UA)
OPC UA is the most capable OPC specification for interoperability between automation software products. It unifies previous OPC "Classic" specifications, data encryption to RSA standards and authentication based on the x509 Certificate standard. Its firewall friendliness allows communications within the automation environment, across the enterprise and through public network segments with high security and performance.

FastDDE and SuiteLink for Wonderware
FastDDE is a DDE format defined by Wonderware. FastDDE allows larger amounts of data to transfer between applications at higher speed and with better error handling than generic DDE. SuiteLink is a client/server communication method that has succeeded FastDDE. It is TCP/IP based and has improved bandwidth and speed. It also configures similarly to FastDDE. All Wonderware client applications support FastDDE and SuiteLink.

Dynamic Data Exchange (DDE)
The DDE format CF_Text is the standard DDE format as defined by Microsoft. All DDE aware applications support the CF_Text format. The DDE Format XL table is the standard DDE format as defined by Microsoft that is used by Excel.

iFIX Native Interface (NIO)
The iFIX Native Interface simplifies the overall connection task by allowing a direct connection to the local iFIX application without the use of the iFIX OPC Power Tool. When supported, this interface has the ability to refine the connection between the server and the iFIX Process Database (PDB) as well.