Communication protocols
Application
Process
Network
independent
Interface
SCSM 1
AL 1
SCSM 2
AL 2
SCSM n
AL n
ACSI
Abstract Comm.
Service Interface
Specific Comm. Service Mapping
Specific
Interface
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Application Layer 7
Layer 1..6
Communication concepts
Peer to peer communication;
time critical
Physical Device
ACSI Client
ACSI Server
reports
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Client / Server communication
Applications of "peer-to-peer"
communication
 tripping of circuit breakers:
short information that needs
to be transmitted with a low
probability of loss within a
few milliseconds
 transmission of sampled
values from instrumental
transformers: high amount
of data, to be transmitted
within a few milliseconds,
loss of data needs to be
detected
Physical Device
Data
Data
req / rsp
Application
Data
Physical Device
req / rsp
ACSI Server
Data
GOOSE Message
Sampled Values
Data
Data
multicast
Application
Physical Device
Application
Communication stack
Application
ACSI
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GOOSE
Samples
Client / Server
Services
MMS
ASN.1
ISO Session
RFC 1006
TCP
IP
EthType
EthType
EthType
Ethernet II
Priority tagging 802.1p/802.1Q
Interface model
7
Technical Services
Station Level
9
Function B
Function A
61850-8-1
1
6
1
Bay Level
Bay Level
3
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Protection
4
6
8
Control
5
HV Equipment
61850-9-2
61850-9-1
3
Protection
4
Control
5
HV Equipment
System overview
d
Plant Intranet
or Internet
LAN Switch
LAN Switch
LAN Switch
IEC 61850-8-1
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Control Network
= Inter Bay Bus
LAN Switch
LAN Switch
IEC 61850-9-x
Process bus