Functionality; L/R Control Access - ABB Relion SMU615 Technical Manual

Section 3
Basic functions
3.13.8.2
3.13.8.3
102

Functionality

Local/Remote control supports multilevel access for control operations in substations
according to the IEC 61850 standard. Multilevel control access with separate station
control access level is not supported by other protocols than IEC 61850.
The actual Local/Remote control state is evaluated by the priority scheme on the
function block inputs. If more than one input is active, the input with the highest
priority is selected. The priority order is "off", "local", "station", "remote", "all".
The actual state is reflected on the CONTROL function outputs. Only one output is
active at a time.
Table 145: Truth table for CONTROL
CTRL_OFF CTRL_LOC
TRUE N/A
FALSE TRUE
FALSE FALSE
FALSE FALSE
FALSE FALSE
FALSE FALSE

L/R control access

Four different Local/Remote control access scenarios are possible depending on the
selected station authority level: "L,R", "L,R,L+R", "L,S,R" and "L, S, S+R, L+S, L
+S+R". If control commands need to be allowed from multiple levels, multilevel
access can be used. Multilevel access is possible only by using the station authority
levels "L,R,L+R" and "L, S, S+R, L+S, L+S+R". Multilevel access status is available
from IEC 61850 data object CTRL.LLN0.MltLev.
Control access selection is made with CONTROL function block and IEC 61850 data
object CTRL.LLN0.LocSta. When writing CTRL.LLN0.LocSta IEC 61850 data
object, IEC 61850 command originator category station must be used by the client,
and remote IEC 61850 control access must be allowed by the merging unit station
authority. CTRL.LLN0.LocSta data object value is retained in the nonvolatile
memory. The present control status can be monitored in the HMI or PCM600 via
Monitoring/Control command with the LR state parameter or from the IEC 61850
data object CTRL.LLN0. LocKeyHMI.
IEC 61850 command originator category is always set by the IEC 61850 client. The
merging unit supports station and remote IEC 61850 command originator categories,
depending on the selected station authority level.
Input
CTRL_STA CTRL_REM
N/A N/A
N/A N/A
TRUE N/A
FALSE TRUE
FALSE FALSE
FALSE FALSE
1MRS758407 B
Output
CTRL_ALL
N/A OFF = TRUE
N/A LOCAL =
TRUE
N/A STATION =
TRUE
TRUE REMOTE =
TRUE
TRUE ALL = TRUE
FALSE OFF = TRUE
SMU615
Technical Manual