Testing PROFIBUS
A-4
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
A.1.5 Functions
Checking the PROFIBUS Cable
In this test, the PROFIBUS cable alone is tested. The following errors can be
detected:
S Short-circuit between data lines or between data line and shield
S Line break
S Shield break
S Reversed polarity (A and B)
S Reflections that could cause errors
S Check of the number of activated terminating resistors
The length of the PROFIBUS cable can also be measured.
Checking the RS-485 Interface of a Slave
The test device is connected to one slave. This is supplied with power. The device
then makes the following measurements:
S RS-485 driver OK/defective
S Power supply to the terminating resistor OK/not OK
S RTS signal present/not present
Checking the Accessibility of Nodes
S List of accessible slaves (live list)
S Addressing of specific slaves
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