• Read records (event, fault, disturbance)
• Time Synchronisation
• Change active setting group
11.3 IEC 61850 PROTOCOL
If Read-Only Mode is enabled for the Ethernet interfacing with IEC 61850, the following commands are
blocked at the interface:
● All controls, including:
▪
Enable/disable protection
▪ Operate Control Inputs
▪ CB operations (Close/Trip, Lock)
▪ Reset LEDs
The following commands are still allowed:
● Read statuses, measurands
● Generate reports
● Extract disturbance records
● Time synchronisation
● Change active setting group
11.4 READ-ONLY SETTINGS
The following settings are available for enabling or disabling Read Only Mode.
● RP1 Read Only
● RP2 Read Only
● NIC Read Only (where Ethernet is available)
These settings are not available for MODBUS and DNP3.
11.5 READ-ONLY DDB SIGNALS
The remote read only mode is also available in the PSL using three dedicated DDB signals:
● RP1 Read Only
● RP2 Read Only
● NIC Read Only (where Ethernet is available)
Using the PSL, these signals can be activated by opto-inputs, Control Inputs and function keys if required.
Chapter 7 - SCADA Communications MiCOM P747
230 P747-TM-EN-1
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