PROFIBUS Manual

The installation check comprises the following measurements:

 

Cable check (cable tester)

A cable tester can typically carry out the following tests:

•are the cable cores twisted?

•are the bus terminations correct and connected in the right number?

•is the line not broken?

•is there any short circuit or earth leakage?

•what cable length has been wired?

•where is the fault in the cable?

 

Installation check

With an installation testing tool it is possible to

•verify the address setting

•check the availability of a station

•measure the signal level of a station

•set an output or read an input if necessary

 

Signal form check (with CRO)

With the help of an oscilloscope - historically also called a CRO (cathode ray oscilloscope) - the signal form can be displayed. This can be used to assess the signal level, line driver function, any reflections present due to incorrect bus terminations, etc.

 

Without special hardware to capture the trigger signal or a periodic signal, no stable signal can be obtained, or it is not possible to identify the source of the signal.

 

For the various checks, we have experience using the following tools:

 

 

Most cable testers can stored measured data. This data may be loaded onto a PC and a measurement report can be created to document the status of a segment.