IEC61850 Memory Arrangement
(Original Document)
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Introduction
The 140 NOP 850 00 module includes two kinds of memory to access:
In the implicit in and out memory area, the first sixteen %MW words are reserved by the module, and are beyond the scope of the DDT.
Implicit Data In
Monitor points, diagnostic information and special information are saved in this area:
Role
Implicit In Direction
Number of %MW Words
Comment
Server
<IED>_SERVER_STATE
20 + ReportDiag
IED -> CPU, synch with PLC cycle
Client
<IED>_CLIENT_STATE
20
IED -> CPU, synch with PLC cycle
Implicit Data Out
The data out buffer:
Role
Implicit In Direction
Number of %MW Words
Comment
Server
MODULE_STATE
20
CPU -> IED, synch with PLC cycle
Monitor points
1980
CPU -> IED, synch with PLC cycle
Explicit Data In
Monitor points, diagnostic information and special information are saved in this area:
Role
Implicit In Direction
Number of %MW Words
Comment
Server
Control points
2000
IED -> CPU, 2000 for server only
Client
Monitor points (status)
2000
IED -> CPU, 2000 for client only
Explicit Data Out
This area supports control points or report/GOOSE operations:
Role
Implicit In Direction
Number of %MW Words
Comment
Client
Control points and control block (Report CB, GOOSE CB, Poll Control)
1000
CPU -> IED