Siemens SINUMERIK 840Di sl - DP Slave Diagnostic Repeater for PROFIBUS DP; Function

PROFIBUS DP Communication
8.11 DP slave diagnostic repeater for PROFIBUS DP
Manual
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
305
8.11 DP slave diagnostic repeater for PROFIBUS DP
8.11.1 Function
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Figure 8-24 Example: PROFIBUS topology with diagnostic repeater
A diagnostic repeater can monitor the segment of an RS 485 PROFIBUS subnet (copper
cable) during normal operation and report line faults in a diagnostic message frame to the
DP master. Used together with the SINUMERIK 840Di sl it is possible to display the location
and cause of the fault in plaintext via SIMATIC STEP 7.
Tasks
The diagnostic repeater primarily performs the following tasks:
● Diagnostic function for two PROFIBUS segments (DP2 and DP3):
The diagnostic function supplies the location and causes of cable breakage such as line
faults or missing terminating resistors.
● Repeater function for three PROFIBUS segments (DP1, DP2, DP3):
The Diagnostics Repeater amplifies the data signals on the bus cables and connects
individual RS 485 segments.