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Troubleshooting I/O Server Communication Problems 49

Troubleshooting I/O Server Communication Problems

This section provides you with some simple steps that can be taken to ascertain and

correct communication problems. The problems described here represent the most

probable causes of communication failure.

Note This is a general troubleshooting guide and for the sake of brevity we cannot cover

every possible source of communication problems.

Debugging Communication Between InTouch and

an I/O Server

This section explains the most common error situations that can occur when attempting

to establish communication between InTouch and a server.

Servers are Window applications that communicate with I/O, PLCs, and/or other data

sources. If a server supports either the Microsoft Dynamic Data Exchange (DDE) or the

Wonderware SuiteLink protocol, it is capable of communicating with the Wonderware

InTouch program.

Note All Wonderware version 7.0 or later servers support both DDE and SuiteLink.

However, the SuiteLink protocol is only supported on the Windows NT (version 4.0 or

later) operating system.

Servers respond to data requests made by other applications. Requesting applications

are called clients. When WindowViewer acts as a client and requires the value of an

item, it contacts the server and requests the item’s value. The server will report the

value and update WindowViewer only if a change occurs. All WindowViewer data

requests provide information relating an item to a register, coil number, or I/O data point

understood by the server. The server uses the information to automatically handle all

messages to and from I/O, hardware devices (PLC), and/or other data sources.

Note We highly recommend starting all the servers required by the InTouch application

before starting WindowViewer. InTouch (versions prior to 7.0) will display the

Initiating DDE Conversation message box for each uninitiated conversation.

For example:

If you start up WindowViewer and cannot successfully establish a conversation with

a server, the following Initiating DDE Conversation dialog box will appear:

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Siemens SIMATIC NET Guide de l'utilisateur Page 53