Hello gbs;

We would be required to understand a bit more about the chosen tolopogy to help you out more precisely.

On Siemens Profibus-DP masters, you have access to SFC 12 "D_Act_DP",it allows you to de-activate a configured Profibus-DP slave (and re-cactivate it later):

How do you enable and disable DP slaves and IO devices using the "D_ACT_DP" instruction?

Enabling a disabled DP slave with SFC 12 "D_ACT_DP"

Notes for the use of the system function SFC12 "D_ACT_DP"

So if your instruments are connected through a DP/DP coupler, they are configured as DP slaves, and you probably couf use SFC 12 with any of them so the master does not send alarms everytime they are removed for calibration or tests.

If on the other hand you are using a DP/PA link, you could only deactivate the link (as a single Profibus-DP slave) at any one time.

Note that if you are using CP 443-5s as Profibus-DP masters in your H-system, you could change the configuration of the Profibus network in runtime (the utility is called CIR) and remove or add slaves as needed, without using SFC 12.

I do not believe there is a similar function that will work over Profibus-PA directly.

I would really like to hear from anyone who has information to correctthis statement.

Hope this helps,

Daniel Chartier

Hello gbs;

Good to know that you have identified at least one problem you can find a solution to. Both Profibus-DP and Profibus-PA buses segments must be terminated (and with different termionators). Be sure they are adequately selected, installed and turned on at the right locations.

Asfor PCS 7 v.5, it is starting to be difficult to find information even on Siemens webpages. But I located this document on the system components of v.5.1; CiR is discussed in section 10:

Configuration information on high-availability systems with PCS 7 V5.1

Unfortunately, the document is only available in German. But the chapters are not long, you could probably use Google Translate (or your favorite translation software, or a german-speaking friend)to have some understanding of the contents of that chapter.

Hope this helps,

Daniel Chartier