Siemens SIPROTEC 6MU805 User Manual page 58

Functions
2.4 Command Processing
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
Switching authority available
Switching authority DIGSI available
Specific device (e.g. switchgear)
Specific device (e.g. switchgear)
Table 2-3
Current switch-
ing authority
status
LOCAL (ON)
LOCAL (ON)
REMOTE (OFF) Not registered
REMOTE (OFF) Registered
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".
54
Interlocking Logic
Switching au- Command issued
thority DIGSI
CS
Not registered Enabled
Registered Enabled
Interlocked
"Switching authority
REMOTE"
Interlocked
"Switching authority
DIGSI"
Y/N (create appropriate object)
Y/N (create appropriate object)
Switching authority LOCAL (check for LOCAL
status): Y/N
Switching authority REMOTE (check for LOCAL,
REMOTE or DIGSI commands): Y/N
Command issued with
with CS = LOCAL or REMOTE
3)
= LOCAL
Interlocked
authority LOCAL"
Interlocked
authority LOCAL"
1)
- Enabled
1)
- Interlocked
authority DIGSI"
C53000-G1140-C380-5, Release date 06.2018
Command issued
with CS = DIGSI
2)
- "Switching Interlocked - "DIGSI
not registered"
2)
- "Switching Interlocked
"Switching authority
LOCAL"
Interlocked - "DIGSI
not registered"
2)
- "Switching Enabled
SIPROTEC, 6MU805, Manual
2)
-