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Valve outputs | forced position
Updates of the object from "Forced position active" to "Forced position active"
or from "Forced position inactive" to "Forced position inactive" produce no re-
action.
The status preset via the forced position object is stored internally in the
device after a bus voltage failure and is restored automatically after a bus
voltage return. After a bus voltage return, the actuator activates the forced po-
sition, if the tracked state allows this. However, when presetting the command
values, only that behaviour is significant, according to the priority sequence,
which the parameter "After bus voltage return" defines (the command value of
the forced position is not activated).
The tracked state of the forced position is not then automatically tracked in the
communication object by the actuator.
After an ETS programming operation, a forced position is always deactivated
and the forced position object is "0". In the polarity "0" = Forced position act-
ive / "1" = No forced position, a "0" telegram must first be received to activate
the forced position.
If, after a bus voltage return, the previously stored object value "0" is restored,
then actuator will also activate the forced position in the polarity "0 = Forced
position active / 1 = No forced position", thus locking the output.
If the forced position object is not enabled, then only the command value para-
meters are available, so that valid preset values are available for the actuator
reset behaviour, as required ("Activate command value according to forced po-
sition").
9.7.1 "Forced position" parameters
VOx - General -> Forced position
Command value
When forced operation is activated via a 1-bit object, after voltage return or after an
ETS programming operation, it is possible to set the forced command value con-
figured here as the active command value.
When the command value of the forced position is recalled, the valve output con-
figured to the command value data formats "Switching (1-bit)" or "Constant (1-byte)
with command value limiting value" is always activated by a constant command
value with pulse width modulation.
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