ABB RELION Series, Technical Manual

Page: 614 / 804

• Command authority: ensures that the command source is authorized to operate
the object
• Mutual exclusion: ensures that only one command source at a time can control the
object
• Interlocking: allows only safe commands
• Execution: supervises the command execution
• Command canceling: cancels the controlling of a selected object.
In direct operation, a single message is used to initiate the control action of a physical
device. The direct operation method uses less communication network capacity and
bandwidth than the SBO method, because the procedure needs fewer messages for
accurate operation.
The “status-only” mode means that control is not possible (non-controllable) via
communication or from LHMI. However, it is possible to control a disconnector
(DCXSWI) from
AU_OPEN
and
AU_CLOSE
inputs.
AU_OPEN
and
AU_CLOSE
control the object directly regardless of
the set Control model . These inputs can be used when control is
wanted to be implemented purely based on ACT logic and no
additional exception handling is needed. However, in case of
simultaneous open and close control, the open control is always
prioritized.
1. Send reservationto other terminals
2. Receive response
Selected
to operate
REF 615 REF 615 REF 615 REF 615
REF 615
A070878 V3 EN
Figure 310: Control procedure in the SBO method
Section 9
1MRS758755 A
Control functions
608 REC615 and RER615
Technical Manual