User Manual
Chapter 4
GFK-2849A
Oct 2019
System Operation
99
Figure 83
The ECM850 can be configured in each CRU system. Each ECM850 communicates with the
same IED and establishes an association. The IED must be configured for connecting with
two or more IEC 61850 client devices. In this example, there are three IEC 61850 Client
devices (ECM850-A in the Primary RX3i controller, ECM850-B in the Secondary RX3i
controller and a third client, Machine-C), The server publishes data to all three clients over
the IEC 61850 network.
Note
:
IEDs used with the ECM850 must have the capability to connect with multiple IEC 61850
Clients. If an IED is not configured to connect with multiple IEC 61850 clients, then the HSB
system with ECM850(s) will not work as described, and one or more of the HSB systems
(Primary or Secondary) may not be able to connect with the IED.
4.8.2
Protocol Output Control for HSB system
The ECM850 acting as IEC 61850 client on both the active and standby units connect to the
IED and fetches input data from the device. Only the active unit (SAU), however, controls
the application using input data from the ECM850 on the active controller. The active unit
(SAU) takes control of the outputs. The input data and output data are transferred as part of
the “Transfer List” from the active unit (SA
U) to the standby unit (SBU) and hence data is
overridden in the SBU. However, the output commands/controls from the SBU should not
be issued to t
he IED. The “Protocol Outputs” should be enabled only for the SAU and
disabled for the SBU. This is depicted in the diagram below.
The HSB concept (produce output data on the wire only on the active unit) is illustrated in
the figure and explained below:
