Siemens SIMATIC NET PROFIBUS manual Functions, Checking the Profibus Cable

Testing PROFIBUS

A.1.5 Functions

Checking the PROFIBUS Cable

In this test, the PROFIBUS cable alone is tested. The following errors can be detected:

SShort-circuit between data lines or between data line and shield

SLine break

SShield break

SReversed polarity (A and B)

SReflections that could cause errors

SCheck 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:

SRS-485 driver OK/defective

SPower supply to the terminating resistor OK/not OK

SRTS signal present/not present

Checking the Accessibility of Nodes

SList of accessible slaves (live list)

SAddressing of specific slaves

A-4	PROFIBUS Networks SIMATIC NET
	6GK1970-5CA20-0AA1 Release 2 05/2000