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
Figure 829: Control procedure in the SBO method
Local/Remote operations
The local/remote selection affects CBXCBR, DCXSWI and ESXSWI.
• Local: the opening and closing via communication is disabled.
• Remote: the opening and closing via LHMI is disabled.
• AU_OPEN and AU_CLOSE inputs function regardless of the local/remote selection.
9.1.5 Application
In the field of distribution and sub-transmission automation, reliable control and
status indication of primary switching components both locally and remotely is
in a significant role. They are needed especially in modern remotely controlled
substations.
1MRS759142 F
Control functions
REX640
Technical Manual
1511
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