PROFIBUS Tester 5 (BC-700-PB) - User Manual
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Copyright 2016 Softing Industrial Automation GmbH
Cable testing error message
displayed on BC-700-PB
Remedial measures - starting points for correctly interpreting and
repairing the indicated fault
Disconnect the devices in the vicinity of the indicated error location
and repeat cable testing in order to narrow down the error cause.
The cable is still affected by unwanted reflections. Though it is not
possible to classify the fault indication. Search for damage on the cable
in the vicinity of the indicated error location and make sure the
PROFIBUS-connectors are assembled correctly.
Unwanted reflections may emerge from transitions between media
and signal conductors which have different impedance values (e.g. two
different cable types).
Sending pulse could not be
detected. The cable is either
too short or not connected.
Do not fall below the minimum cable length of 3 meters. The intended
use of cable testing requires a cable with adequate length.
(Near-end) terminator
switched on
No reflections could be
detected. Please remove
terminators.
During the first of the three steps of cable testing the PROFIBUS Tester
requires an open cable on both sides. However, the tester detected an
ohmic resistance between the signal wires and the resistance value is
in the range of bus terminators. Make sure, that every bus terminator
on every PROFIBUS-connector is switched off or is deactivated.
Check the dip-switch for switching on/off bus terminators for proper
function.
The ideal idle voltage between signal wires A and B of a cable segment,
which is properly terminated on both sides is approximately 1.1 Volts.
The PROFIBUS-Tester detected voltage values higher than 3 Volts
between the signal wires A-B; A-Shield and/or B-Shield. These
unwanted potential differences obstruct the cable testing function, the
test results will become void and running leakage currents may
damage the PROFIBUS-Tester.
Take care of proper functional earthing of your plant.
We recommend removing the mains adapter and to operate on the
BC-700-PB by means of the built-in battery if you are receiving this
error message. This will avoid damage caused by leakage currents.
Take also into consideration that the error cause could be a defective
RS-485 driver of a PROFIBUS-device. Troubleshooting EMC and
earthing issues are a highly complex field of activity. Therefore we
recommend asking service providers which are primarily specialized in
troubleshooting the above mentioned issues.
Far-end / Near-end
terminator not powered.
The corresponding bus terminator has been switched on, but the
terminator is improperly powered by 5 V supply voltage, yet.
During the cable testing the PROFIBUS Tester requires a properly
terminated cable at the far end (2nd test step) or on both sides of the
cable segment (3rd test step). A properly terminated cable segment
consists of activated and powered bus terminators on both sides of the
cable.
Make sure that the corresponding PROFIBUS-device at the
corresponding end of the cable segment is powered and that th
activated bus terminator is properly plugged to a powered PROFIBUS-
device.
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