Hello, experts! 

Do you know what :P after an Analog Output Address means? 

Sample: %QW256:P

Thank you! 

Hello.

That notation is used in Step7 (TIA Portal).

See date code "3/11/2016 3:35 PM" - (LINK).

ChristophD

Hello,

if you work with %IW and %QW you work with the process image.

In a S7-300 the process image size default is 128 bytes.

So the adress 700 and 800 outside the default process image of the plc and can't be accessed with %IW and %QW.

Check that the processimage size is > 800, you can configure this in the properties of the PLC.

If you wouldn't work with the process image acces the you can use the peripherie direct access.

In the  old Step7 V5 you use the syntax PQW and PIW.

In TIA you must use the Syntax QW<adress>:P and IW<adress>:P

Regards

Christoph

Greetings.
- Dan

Allan Marum

Hello, experts! 

Do you know what :P after an Analog Output Address means? 

Sample: %QW256:P

Thank you!