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Redundant LAN (PRP/HSR operation)
11.2.2
The user can allow the IED operate in the redundant LAN communication (IEC 62439-3). To
operate, the user should set either PRP or HSR for scheme switch [RedundantMode].
Overview
(i)
'Parallel redundancy protocol (PRP)' is designed for double LAN networks in order to construct
high availability automation networks. Figure 11.2-2 shows an IED (i.e., Source, IED1 with
Port A and Port B†) and a server (i.e., Destination, Substation computer with Port A and Port
B). They are connected through LAN_A and LAN_B. For duplicating data, the IED have Link
redundancy entity (LRE) so that the IED can transfer data with A-Frame packet and B-Frame
packet at the same time. At the destination, either frames being arrived later is removed.
Substation computer
Destination
A-Frame
B-Frame
TOSHIBA
Tx Rx
Tx Rx
Port A
Port B
LAN module
LAN module
(C11)
(C12)
Data
I
CPU
O
CLEAR
IED1
Source
Figure 11.2-2 PRP example for redundant LAN_A and LAN_B with DANP
†Note: For the locations about the LAN module, see Chapter
Signal processing and communication modules
‡Note: IED3 and Operator workstation (connected with singly attached node) can join
the network with Redundancy boxes (RedBox).
'High-availability Seamless redundancy (HSR)', for the ring topology, is designed to achieve
high reliability communication. Figure 11.2-3 illustrates IEDs connected over the ring LAN.
As doubly ports (Port A and Port B) are embedded in an IED, the IED can transfer the data
packet (A-Frame and B-Frame) for the destination over the ring LAN.
CPU
Data
Port A
Port B
Tx
Tx
Rx
Rx
Rx
Tx
Tx
Port A
Port B
LAN module
LAN module
ENTER
(C11)
(C12)
Cancel
L
Data
R
F1
F2
F3
F4
F5
CPU
IED2
- 866 -
Operator
workstation
RedBox‡
TOSHIBA
Rx
Tx
Port A
ENTER
LAN module
Cancel
L
I
R
F2
F3
F4
F5
F1
O
CLEAR
CPU
IED3
(→p. 645).
6F2T0207 (0.01)
LAN_A
LAN_B
RedBox‡
TOSHIBA
Rx
(C11)
ENTER
Data
Cancel
L
I
R
F2
F3
F4
F5
F1
O
CLEAR
Technical description:
GRE200 (5,6)
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