Siemens Sinumerik 840DiE sl - DP Slave: Diagnostic Repeater for PROFIBUS DP

01/2007
8.11 DP slave: Diagnostic repeater for PROFIBUS DP
8-238
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
8.11 DP slave: Diagnostic repeater for PROFIBUS DP
8.11.1 Function
SINUMERIK 840Di sl
DP Master
PG with SIMATIC STEP 7
Start:
Topology
determination
Diagnostics
Slave distance
Distance to
fault
Segment 1
Segment 3Segment 2
Diagnostic repeaters
DP Slave 611U ADI4 DP slave
DP slave
POSMO A
DP–Slave ET200 DP slave MCP 483
Fig. 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.
The diagnostic repeater primarily performs the following tasks:
S Diagnostic functions for two PROFIBUS segments (DP2 and DP3):
The diagnostic function supplies the location and causes of cable faults
such as wire breaks or missing terminating resistors.
S Repeater functions for three PROFIBUS segments (DP1, DP2, DP3):
The diagnostic repeater amplifies the data signals on the bus cables and
connects up individual RS 485 segments.
S Galvanic separation of the PG interface:
Galvanically or electrically isolating the PG interface prevents interference
with the other bus segments of the PROFIBUS DP if the PG connecting
cable is inserted or removed, even at high baud rates.
S Monitoring functions of the clock–synchronous PROFIBUS
8 PROFIBUS DP Communication