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46 Wonderware Siemens SIMATIC NET S7 I/O Server

Monitoring the Status of Communications with a PLC

For each topic name (PLC), there is a built-in discrete item that can be used to monitor

the status of communications with the PLC. The discrete item, Status, is set to 0 when

communication with the PLC fails and is set to 1 when communication is successful.

Using the Status Item in Excel

The status of the PLC communications can be read into Excel by entering the following

DDE reference formula in a cell on a spreadsheet:

=S7|S7PLC400!Status

where:

S7 Is the name (without extension) of the server application.

S7PLC400 Is the exact topic name defined in the server for the PLC.

Status Built-in discrete item used to monitor the status of

communications with the PLC.

Monitoring the Status of Communications with InTouch

InTouch supports built-in topic names called DDEStatus and IOStatus that are used to

monitor the status of communications between the server and InTouch. For more

information on the built-in topic names DDEStatus and IOStatus, see your online

”InTouch User’s Guide”.

Using DDEStatus and IOStatus in Excel

The status of communication between the server and InTouch can be read into Excel by

entering the following DDE reference formula in a cell on a spreadsheet:

=view|DDEStatus!S7PLC400

or:

=view|IOStatus!S7PLC400

where:

view Is the name of the InTouch application.

[DDE][IO]Status Built-in topic name used to monitor the status of

communications between the server and InTouch.

S7PLC400 The exact access name defined in InTouch for the S7 I/O

server.

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