8 READ ONLY MODE
With IEC 61850 and Ethernet/Internet communication capabilities, security has become an important issue. For
this reason, all relevant General Electric IEDs have been adapted to comply with the latest cyber-security
standards.
In addition to this, a facility is provided which allows you to enable or disable the communication interfaces. This
feature is available for products using Courier, IEC 60870-5-103, or IEC 61850.
8.1
IEC 60870-5-103 PROTOCOL BLOCKING
If Read-Only Mode is enabled for RP1 or RP2 with IEC 60870-5-103, the following commands are blocked at the
interface:
● Write parameters (=change setting) (private ASDUs)
● General Commands (ASDU20), namely:
○ INF16 auto-recloser on/off
○ INF19 LED reset
○ Private INFs (for example: CB open/close, Control Inputs)
The following commands are still allowed:
● Poll Class 1 (Read spontaneous events)
● Poll Class 2 (Read measurands)
● GI sequence (ASDU7 'Start GI', Poll Class 1)
● Transmission of Disturbance Records sequence (ASDU24, ASDU25, Poll Class 1)
● Time Synchronisation (ASDU6)
● General Commands (ASDU20), namely:
○ INF23 activate characteristic 1
○ INF24 activate characteristic 2
○ INF25 activate characteristic 3
○ INF26 activate characteristic 4
Note:
For IEC 60870-5-103, Read Only Mode function is different from the existing Command block feature.
8.2
COURIER PROTOCOL BLOCKING
If Read-Only Mode is enabled for RP1 or RP2 with Courier, the following commands are blocked at the interface:
● Write settings
● All controls, including:Reset Indication (Trip LED)
○ Operate Control Inputs
○ CB operations
○ Auto-reclose operations
○ Reset demands
○ Clear event/fault/maintenance/disturbance records
○ Test LEDs & contacts
Chapter 22 - Communications P543i/P545i
596 P54x1i-TM-EN-1
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