User Manual PROFview XL 4 The PROFview XL Application Software
connection point. To ensure that this function works correctly, observe the supplementary conditions de-
scribed in the Section 3.4.4 "Topology scan".
After all stations connected to the bus have been included in the station list using the master simulator and
the "Station scan" function, you can click on the "Topology scan" button to start the topology determination
function. A dialog box opens to display the progress of the measurement. The distances for all stations in-
cluded in the station list and marked as "to be measured" (
) are now determined. The time required to de-
termine the topology depends on the baud rate you are using and the bus configuration. Especially for plants
with a large number of stations and a high baud rate, the topology determination can take several minutes.
Once the measurement has been completed successfully, the dialog box is closed automatically, and the
topology determined is displayed in the Topology display.
4.5.2 Recording the online monitoring
The measured values "Illegal frames" and "Bus cycle time" displayed in the message bar can be recorded if
necessary and also saved in the PBT document. To start recording, click with the left mouse button either on
the option or on appropriate icon in the message bar. The current measurement values are displayed in the
text fields. While the recording is running, the
icon is displayed in the message bar. In contrast to the
message bar, it is not the current value, but the average value since the start of recording which is calculated
and displayed in the text field for the bus cycle time. The remaining fields correspond to those displayed in
the message bar.
When using the recording functions, please note that the stored values are lost when stopping and then
restarting the recording process and are then overwritten by the new values. For this reason, when opening a
PBT document, the recording is first always deactivated.
If the illegal frame counter or the bus cycle time is reset when recording (double-click on "Illegal frames" or
"Bus cycle time" in the message bar), this will also have an effect on the recording values; these values will
be reset. The recording functions can be used independently of any other measurements performed on the
PBT.
4.5.3 Evaluation
When evaluating the measurement data, you will be assisted by the PBT application software by way of an
automatic evaluation of the results. This function is activated/deactivated via "Automatic evaluation". For the
evaluation, the following limit values must be set; they will be stored in the current document:
Critical quality level (500 ... 5,000; critical measured value if not reached)
Critical disturbance-free voltage range (0.5 ... 5.0 V; critical measured value if not reached)
Critical rising and falling edges (1/16 ... 16/16 V; critical measured value when exceeded)
With the evaluation function activated, the measured values are evaluated on the basis of the set critical limit
values and - if necessary - highlighted. If there any stations which cannot be measured (e.g. due to a logger
interval which is too short) or if a timeout occurs, this information is also logged and displayed.
4.5.4 Station list
The station list contains all PROFIBUS stations determined using the "Station scan" function. Each station
can be assigned a customized designation, and various settings can be made.
PROFview XL 19
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