User Manual
Chapter 1
GFK-2849A
Oct 2019
Introduction
14
ICD File
IED Capability Description (ICD) files: Type of SCL file as defined in IEC 61850-6
standards
IED
Intelligent Electronic Device supporting the IEC 61850 client-server protocol
LD
Logical Device
LN
Logical Node
Mbps
Megabits per second, or 1,000,000 bits per second, a measure of a
communication channel’s
(such as Ethernet) signaling rate
MICS
Model Implementation Conformance Statement for IEC 61850
MMS
Manufacturing Message Specification
Modbus/TCP
An Ethernet-based implementation of the Modbus protocol used to allow
supervisory computers to exchange data with controllers.
Multicast
In Ethernet, the transmission of a network message to all hosts within a host
group.
NMS
Network Management System. Executes applications that monitor and control
managed devices in an SNMP-managed network.
NSAU
Non-Synchronized Active Unit. In the event of redundancy link failure in a hot-
standby system, both of the controllers in the system become NSAUs.
PICS
Protocol Implementation Conformance Statement for IEC 61850
PIXIT
Protocol Implementation extra Information for Testing as per IEC 61850
standards
PLC
Programmable Logic Controller; in the context of this manual, the PACSystems
RX3i controller
PPV
PLC Protocol Variables. RX3i controller symbolic variables which represents
variable data from an IED. This also includes additional variables that are required
for performing write operations to the IED.
RCB
Report Control Block
Remote Node
For an RX3i IEC 61850 network, a Remote Node is any IED.
SCL
Substation Configuration description Language (SCL) as defined in IEC 61850-6
SFP
Small Form-factor Pluggable. Pluggable, hot-swappable Ethernet transceivers.
SRTP
Service Request Transport Protocol, an Ethernet-based client-server protocol
that allow clients to read and write system memory of SRTP-capable Emerson
devices
Status Bits
Module status data in RX3i CPU reference memory.
SVC_REQ
Service Request Function Block. A control system service initiated by the RX3i
CPU.
Unicast
In Ethernet, the transmission of a network message to an individual host.
Update Period
The time between cyclic data transfers between an ECM850 and an IED.
