Read Only Mode; Courier Protocol Blocking - GE P24DM Technical Manual

Chapter 16 - Communications
7

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.
7.1 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.
7.2

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
○
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P24xM
P24xM-TM-EN-2.1