ABB 615 series Technical Manual page 969

1MAC059074-MB A
615 series ANSI
Technical Manual
apparatus fails to enter the correct state, the output pulse is deactivated after the set
Operation timeout setting, and an error message is displayed. When the Adaptive pulse is
set to "FALSE", the functions always use the maximum pulse width, defined by the user-
configurable Pulse length setting. The Pulse length setting is the same for both the
opening and closing commands. When the apparatus already is in the right position, the
maximum pulse length is given.
The Pulse length setting does not affect the length of the trip pulse.
Control methods
The command execution mode can be set with the Control model setting. The alternatives
for command execution are direct control and secured object control, which can be used
to secure controlling.
The secured object control SBO is an important feature of the communication protocols
that support horizontal communication, because the command reservation and
interlocking signals can be transferred with a bus. All secured control operations require
two-step commands: a selection step and an execution step. The secured object control is
responsible for the several tasks.
• 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 (29DC)
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
Section 9
Control functions
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