Parallel Redundancy Protocol (PRP IEC 62439‑3 (2012))
●
The PRP uses two independent Ethernet networks that operate in parallel.
The PRP is a “redundancy in the devices” method that provides bumpless
switchover in case of failure or reintegration. Furthermore, it provides the
shortest Ethernet network reconfiguration time as network reconfiguration
is seamless.
Rapid Spanning Tree Protocol (RSTP IEEE 802.1D‑2004)
●
This board offers compatibility with any RSTP device. RSTP is a standard
used to quickly reconnect a network fault by finding an alternative path,
allowing loop-free network topology. Although RSTP can recover network
faults quickly, the fault recovery time depends on the number of devices
and the topology.
This board offers compatibility with any RSTP device, and in particular with
C264 (with the “SWS2x2” Switch Unit fitted).
Self Healing Protocol (SHP)
●
Self healing is applied to double ring network topologies and allows a
complete network reconfiguration time of less than 1 s.
When a fiber is broken, both end stations detect the break. Using both the
primary and redundant networks the ring is automatically reclosed.
This board offers compatibility with C264 (with the “SWR2x2” Switch
Redundant Unit fitted) and MiCOM H35x multi-mode switches. Self Healing
Protocol is a Schneider Electric proprietary solution providing extremely
fast recovery time.
Dual Homing Protocol (DHP)
●
Dual home is applied to double star architectures and provides bumpless
redundancy (0 ms change over time).
If the optical fiber connection between two devices is broken, the network
continues to operate correctly. The dual homing mechanism handles
topologies where a device is connected to two independent networks. One
is the main link, the other is the backup. Both are active at the same time.
This board offers compatibility with C264 (with the “SWD2x2” Switch Unit
fitted) and MiCOM H36x multi-mode switches. Dual Homing Protocol is a
Schneider Electric proprietary solution providing bumpless redundancy to
the P634.
3.4.5.3 Generic Functions for All Redundant Ethernet Boards
The following apply to all four redundant Ethernet protocols (SHP, RSTP, DHP and
PRP).
Ethernet 100Base Fx
The fiber optic ports are full duplex 100 Mbps ST connectors.
Forwarding
The devices from the families Easergy MiCOM 30, 40, the C264 and the MiCOM H
switches support store and forward mode. The MiCOM switch forwards messages
with known addresses to the appropriate port. The messages with unknown
addresses, the broadcast messages and the multicast messages are forwarded
out to all ports except the source port. MiCOM switches do not forward error
packets, 802.3x pause frames or local packets.
P634
3 Operation
3-32 P634/EN M/R-42-A // P634‑311‑653
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