5.7 INPUTS AND OUTPUTS
VIRTUAL OUTPUT 1 ID:
VIRTUAL OUTPUT 1 EVENTS:
a) REMOTE INPUTS/OUTPUTS OVERVIEW
Remote inputs and outputs provide a means of exchanging digital state information between Ethernet-networked devices.
The IEC 61850 GSSE (Generic Substation State Event) and GOOSE (Generic Object Oriented Substation Event) stan-
dards are used.
The IEC 61850 specification requires that communications between devices be implemented on Ethernet. For UR-
series relays, Ethernet communications is provided on all CPU modules except type 9E.
The sharing of digital point state information between GSSE/GOOSE equipped relays is essentially an extension to Flex-
Logic™, allowing distributed FlexLogic™ by making operands available to/from devices on a common communications net-
work. In addition to digital point states, GSSE/GOOSE messages identify the originator of the message and provide other
information required by the communication specification. All devices listen to network messages and capture data only from
messages that have originated in selected devices.
IEC 61850 GSSE messages are compatible with UCA GOOSE messages and contain a fixed set of digital points. IEC
61850 GOOSE messages can, in general, contain any configurable data items. When used by the remote input/output fea-
ture, IEC 61850 GOOSE messages contain the same data as GSSE messages.
Both GSSE and GOOSE messages are designed to be short, reliable, and high priority. GOOSE messages have additional
advantages over GSSE messages due to their support of VLAN (virtual LAN) and Ethernet priority tagging functionality.
The GSSE message structure contains space for 128 bit pairs representing digital point state information. The IEC 61850
specification provides 32 "DNA" bit pairs that represent the state of two pre-defined events and 30 user-defined events. All
remaining bit pairs are "UserSt" bit pairs, which are status bits representing user-definable events. The C30 implementation
provides 32 of the 96 available UserSt bit pairs.
The IEC 61850 specification includes features that are used to cope with the loss of communication between transmitting
and receiving devices. Each transmitting device will send a GSSE/GOOSE message upon a successful power-up, when
the state of any included point changes, or after a specified interval (the default update time) if a change-of-state has not
occurred. The transmitting device also sends a 'hold time' which is set greater than three times the programmed default
time required by the receiving device.
Receiving devices are constantly monitoring the communications network for messages they require, as recognized by the
identification of the originating device carried in the message. Messages received from remote devices include the mes-
sage time allowed to live. The receiving relay sets a timer assigned to the originating device to this time interval, and if it
has not received another message from this device at time-out, the remote device is declared to be non-communicating, so
it will use the programmed default state for all points from that specific remote device. If a message is received from a
remote device before the time allowed to live expires, all points for that device are updated to the states contained in the
message and the hold timer is restarted. The status of a remote device, where "Offline" indicates non-communicating, can
The remote input/output facility provides for 64 remote inputs and 64 remote outputs.
b) LOCAL DEVICES: ID OF DEVICE FOR TRANSMITTING GSSE MESSAGES
In a C30 relay, the device ID that represents the IEC 61850 GOOSE application ID (GoID) name string sent as part of each
GOOSE message is programmed in the
Likewise, the device ID that represents the IEC 61850 GSSE application ID name string sent as part of each GSSE mes-
sage is programmed in the
In C30 releases previous to 5.0x, these name strings were represented by the
C30 Controller System
5.7.5 REMOTE DEVICES
IEC 61850 PROTOCOL
IEC 61850 PROTOCOL