RSTI-EP PROFINET I/O Controller User Manual
Section 6
GFK-2571R
May 2021
Redundant Media
139
Figure 99: Ring Topology with One Controller
As a Media Redundancy Manager, the PROFINET Controller detects when the network ring
has been broken and repaired. Each time the PROFINET Controller detects that the ring has
been broken or repaired, a fault is reported in the Local Log table and that condition is
passed to the RX3i CPU to be registered in the CPU fault table. In addition, the PROFINET
Controller keeps a count of break/repair detections. In the PNC001-Ax module, this may be
viewed via the CLI show rdnmedia command.
As a Media Redundancy Manager, the PROFINET Controller detects whether another Media
Redundancy Manager is on the same ring. If more than one Media Redundancy Manager is
present on the same ring, the PROFINET Controller logs an entry in its Local Log table and
passes the fault to the RX3i CPU fault table. Upon detecting that there are no longer multiple
Media Redundancy Managers on the ring, the PROFINET Controller logs a fault in the Local
Log and passes this to the RX3i CPU to be registered in the CPU fault table. This indicates
that the previously invalid setup has subsequently been resolved.
6.3
Ring Topology with Multiple Controllers
Figure 100 shows a more complex network. There is one RX3i CPU node with two PROFINET
Controllers, a second RX3i CPU node with one PROFINET Controller, and five I/O Devices, in
this case, PNS modules. The PROFINET Controllers depicted are PNC001 modules but could
be embedded PROFINET Controllers.
All devices are on the same network ring. One PROFINET Controller is configured as the
Media Redundancy Manager (MRM); the other PROFINET Controllers and all PROFINET
Scanners are configured as Media Redundancy Clients (MRCs).
Summary of Contents for PACSystems RX3i
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