11 READ ONLY MODE
With IEC 61850 and Ethernet/Internet communication capabilities, security has become an important issue.
In view of this, all MiCOM devices comply with the latest Cyber-Security (on page 273
) standards. In
addition to this, the device provides a facility to allow the user to enable or disable the physical interfaces.
This feature is available for products using Courier, IEC 60870-5-103, or IEC 61850.
Note:
For IEC 60870-5-103, Read Only Mode function is different from the existing Command block feature.
11.1 IEC 60870-5-103 PROTOCOL
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
11.2 COURIER PROTOCOL
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
The following commands are still allowed:
• Read settings, statuses, measurands
MiCOM P747 Chapter 7 - SCADA Communications
P747-TM-EN-1 229
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