
Functions
2.4 Command Processing
SIPROTEC, 6MU805, Manual
C53000-G1140-C380-5, Release date 06.2018
54
Switching Authority
The interlocking condition "Switching authority" serves for determining the switching authority. It enables the
user to select the authorized command source. The following switching authority ranges are defined in the fol-
lowing priority sequence:
• LOCAL
• DIGSI
• REMOTE
The "Switching authority" object serves for interlocking or unlocking LOCAL control, but not REMOTE or DIGSI
commands. With a 6MU805, the switching authority can be changed between "REMOTE" and "LOCAL" on the
operator panel after having entered the password, or by means of CFC also via binary inputs and a function key.
The "Switching authority DIGSI" is used for interlocking and allows commands to be initiated using DIGSI. This
allows for local as well as remote DIGSI connections. When a (local or remote) DIGSI PC logs on to the device,
it enters its Virtual Device Number (VD). Only commands with this VD (when switching authority = OFF or
REMOTE) are accepted by the device. When the DIGSI PC logs off again, the VD is canceled.
Commands are checked for their source CS and the device settings and compared to the current status set in
the objects "Switching authority" and "Switching authority DIGSI".
Configuration
Table 2-3
Interlocking Logic
1)
also "Enabled" for: "Switching Authority LOCAL (check for LOCAL status): n"
2)
also "Enabled" for: "Switching authority REMOTE (check for LOCAL, REMOTE or DIGSI commands): n"
3)
CS = command source
CS = Auto:
Commands that are initiated internally (command processing in the CFC) are not subject to the switching au-
thority and are therefore always "enabled".
Switching authority available
Y/N (create appropriate object)
Switching authority DIGSI available
Y/N (create appropriate object)
Specific device (e.g. switchgear)
Switching authority LOCAL (check for LOCAL
status): Y/N
Specific device (e.g. switchgear)
Switching authority REMOTE (check for LOCAL,
REMOTE or DIGSI commands): Y/N
Current switch-
ing authority
status
Switching au-
thority DIGSI
Command issued
with
= LOCAL
Command issued with
CS = LOCAL or REMOTE
Command issued
with CS = DIGSI
LOCAL (ON)
Not registered
Enabled
Interlocked
- "Switching
authority LOCAL"
Interlocked - "DIGSI
not registered"
LOCAL (ON)
Registered
Enabled
Interlocked
- "Switching
authority LOCAL"
"Switching authority
LOCAL"
REMOTE (OFF) Not registered
Interlocked
-
"Switching authority
REMOTE"
Enabled
Interlocked - "DIGSI
not registered"
REMOTE (OFF) Registered Interlocked
-
"Switching authority
DIGSI"
Interlocked
- "Switching
authority DIGSI"
Enabled