ABB RELION REX640 Technical Manual page 1362

Section 9
Control functions
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Figure 724: 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.
1MRS759142 C
REX640
Technical Manual