Figure 518: OPEN and CLOSE outputs logic for CBXCBR
Opening and closing pulse widths
The pulse width type can be defined with the
Adaptive pulse setting. The function
provides two modes to characterize the opening and closing pulse widths. When
the
Adaptive pulse is set to “TRUE”, it causes a variable pulse width, which
means that the output pulse is deactivated when the object state shows that the
apparatus has entered the correct state. If 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
Control functions
1MRS757644 H
986
620 series
Technical Manual