APPENDIX G: REDUNDANCY PROTOCOL G.1 PRP AND HSR ETHERNET PROTOCOLS
GEK-106310-AF F650 DIGITAL BAY CONTROLLER g-5
PRP can be enabled in configuration through a setting available on the network configuration menu (Product Setup?
Communication Settings? Network (Ethernet), REDUNDANCY, which already has the capability of enabling Failover
redundancy. When REDUNDANCY is set to PRP, the ports dedicated for PRP operate in redundant mode.
The rights associated with configuring PRP follow the security requirements for network configuration.
PRP management through SNMP MIB is not supported, as F650 doesn’t currently support SNMP for configuration. Settings
and actual values are only available through the front panel and through EnerVista.
The PRP solution to implement must ensure that performance requirements stated in IEC 61850-5 Clause 13 are still met. It
is specified under Clause 13 (Message performance requirements) that messages of type 1A must meet the performance
class P2/3, which is 3ms (See 3.7.1.1).
G.1.2 HSR
HSR defines a redundancy protocol for high availability in substation automation networks, based on PRP principles,
provides the property of zero recovery time, typically used in ring topology but applicable to any topology.
In the F650 relay, HSR is implemented in devices with communication option number K (for Fiber; 100 Base Fx) and M (for
cooper; Base 100 Tx). A frame is sent over both ports. A destination should receive, in the fault-free state, two identical
frames within a certain time skew, forward the first frame to the application and discard the second frame when (and if) it
comes. A sequence number is used to recognize such duplicates.
In contrast to PRP (IEC 62439-3- Clause 4), with which it shares the operating principle, HSR nodes are arranged into a ring,
which allows the network to operate without dedicated switches, since every node is able to forward frames from port to
port. HSR originally meant "High-availability Seamless Ring", but HSR is not limited to a simple ring topology.
Redundant connections to other HSR rings and to PRP networks are possible.
To Next Page
Loading...