Siemens 6MD85, Manual

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Function group
Functions are brought together into function groups (FG). The assignment of functions to current and/or
voltage transformers (assignment of functions to measuring points), the information exchange between the
function groups via interfaces as well as the generation of group indications are important for this bringing
together.
General interrogation
The state of all process inputs, of the status and of the error image are scanned on system startup. This infor-
mation is used to update the system-side process image. Likewise, the current process state can be interro-
gated after data loss with a general interrogation (GI).
Generic Object-Oriented Substation Event
GOOSE. IEC 61850 protocol for communication between bay units.
GI
See General Interrogation
GIN
Generic Identification Number
GOOSE
See Generic Object-Oriented Substation Event.
Ground
The conductive ground whose electric potential can be set equal to 0 at every point. In the area of grounding
conductors, the ground can have a potential diverging from 0. The term reference ground is also used for
this situation.
Grounding
The grounding is the entirety of all means and measuring for grounding.
Hierarchy Level
In a structure with superordinate and subordinate objects, a hierarchy level is a level of equal-ranking objects.
High Availability Seamless Redundancy Protocol
Like PRP (Parallel Redundancy Protocol), HSR (High Availability Seamless Redundancy Protocol) is specified in
IEC 62439-3. Both protocols offer redundancy without switching time.
The principal function can be found in the definition of PRP. With PRP, the same message is sent via 2 sepa-
rated networks. In contrast to this, in the case of HSR the message is sent twice in the 2 directions of the ring.
The recipient receives it correspondingly via 2 paths in the ring, takes the 1st message and discards the 2nd
(see PRP).
Whereas NO messages are relayed in the end device in the case of PRP, a switch function is installed in the HSR
node. Thus, the HSR node relays messages in the ring that are not directed at it.
In order to avoid circular messages in the ring, corresponding mechanisms are defined in the case of HSR.
SAN (Single Attached Node) end devices can only be connected with the aid of a REDBOX in the case of HSR.
PRP systems and HSR systems can be coupled redundantly with 2 REDBOXES.
HSR
See High Availability Seamless Redundancy Protocol
Glossary
SIPROTEC 5, High-Voltage Bay Controller, Manual 1243
C53000-G5040-C015-9, Edition 11.2017