Figure 283: Edition 2 system - backward compatibility
An Edition 2 IED cannot normally operate within an Edition 1 IEC 61850 system. An Edition 2 IED can work for
GOOSE messaging in a mixed system, providing the client is compatible with Edition 2.
Figure 284: Edition 1 system - forward compatibility issues
7.4.11.2 EDITION-2 COMMON DATA CLASSES
The following common data classes (CDCs) are new to Edition 2 and therefore should not be used in GOOSE control
blocks in mixed Edition 1 and Edition 2 systems
● Histogram (HST)
● Visible string status (VSS)
● Object reference setting (ORG)
● Controllable enumerated status (ENC)
● Controllable analogue process value (APC)
● Binary controlled analogue process value (BAC)
● Enumerated status setting (ENG)
Chapter 21 - Communications P446SV
566 P446SV-TM-EN-1