PROFIBUS Tester 5 (BC-700-PB) - User Manual
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Copyright 2016 Softing Industrial Automation GmbH
9
Tips and tricks for cable testing
Perform cable test in stand-alone mode without mains adapter connected
When using the cable test function we recommend removing the mains adapter and
operating on the BC-700-PB by means of the built-in battery in stand-alone operation
mode.
9.1 Assessment criteria
The cable test function examines the cabling in PROFIBUS DP segments and summarizes the test result
in a single statement ("Ok" or "Error"). Amongst technical criteria with respect to the cabling the overall
assessment incorporates additional criteria with respect to the workflow and to plant planning. Under
certain conditions a user may not be able to successfully finish cable testing in a dedicated segment
(e.g. at a very early installation phase of a facility, when there is no possibility to power the bus
terminators). In such a case it is recommended adding a comment to the corresponding test report
which clarifies the circumstances that lead to the negative cable test result. Not all errors will inevitably
lead to downtimes or represent under the specific circumstances a severe error. At last, the
commissioner or maintenance personnel decides, if a PROFIBUS-network is functioning properly or
notl. The corresponding person gets necessary information and recommendations by means of using
appropriate PROFIBUS diagnostic tools. The table below contains assessment criteria which must be
fulfilled in order to successfully complete the cable testing function.
Failed, if at least one of the following criteria is
fulfilled
Passed, if all of the following criteria are fulfilled
Substatial troubleshooting effort was carried out
unsuccessfully and there are still errors on the
cabling
All cabling errors have been successfully
eliminated
The corresponding PROFIBUS DP segment is still
affected by reflections on the cable
The corresponding PROFIBUS DP cable segment is
free of reflections
The user did not run through the tree steps of
cable testing
The user has run through each of the three steps
of cable testing successfully
Detection of the cable segment length fails
The cable segment length has been successfully
detected
Bus termination is not as expected
The terminators at both ends of the cable
segment are switched on and properly powered
The detected cable segment length exceeds the
limit value specified by PI (PROFIBUS PROFINET
International)
The baudrate (entered by user) and the detected
cable segment length fit together according to PI
recommendation (PROFIBUS PROFINET
International)
9.2 Cable test - fault indications and remedial measures
The classifying text messages in the graphical user interface of BC-700-PB which describe the cabling
errors are kept concisely. The table below lists possible cabling error messages and provides a detailed
description of the discovered fault indications. The column on the right contains "remedial measures"
and further starting points in order to correctly interpret and to repair the indicated fault.
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