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Valve outputs | forced position
Maximum command value
The maximum command value that is valid when the command value limit is activ-
ated is defined here.
9.6.2 Objects for command value limit
Function: Command value limit
Object no.
26, 41, 56,
71, 86, 101
1-bit input object for requirement-orientated activating and deactivating of a com-
mand value limit. The telegram polarity is fixed: "0" = Command value limit inactive,
"1" = Command value limit active. Updates of the object from "1" to "1" or "0" to "0"
do not produce a reaction.
If required, this object is only available for valve outputs configured in the ETS to the
command value data format "Constant (1-byte) with pulse width modulation (PWM)".
It is possible to have the actuator activate the command value limit automatically
after bus voltage return or an ETS programming operation. The status of the com-
mand value limit is not then automatically tracked in the communication object.
9.7
forced position
A forced position can be configured separately for each valve output and activated
according to requirements. If a forced position is active, a defined command value is
set at the output. Affected valve outputs are then locked so that they can no longer
be activated using functions subject to the forced position (including activation by
command value telegrams).
The command value of the forced position is always constant and is configured indi-
vidually in the ETS (0...100% in 10% steps). The command value is executed elec-
trically at the output using a pulse width modulation (PWM).
When a forced position is active, valve outputs configured to the command
value data formats "Switching (1-bit)" or "Constant (1-byte) with command
value limiting value" are always activated by a constant command value with
pulse width modulation. In this case, this constant command value is also in-
cluded in the calculation of the largest command value (optional function) until
the forced position is exited and no other function with a constant command
value presetting (e.g. emergency operation, manual operation) is active.
The configured valve direction of action (deenergised closed / deenergised
opened) is taken into account in the electrical activation of the outputs by a
forced position. With deenergised closed valves, the switch-on time is derived
directly from the configured PWM and the cycle time. In the case of deener-
gised opened valves, the switch-on time is inverted.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Function
Command value
limit - Activate / De-
activate
55 ... 100%
Name
VO x - Input (Xx =
1...6)
Type
DPT
Flag
1-bit
1,002
C, (R), W, -,
-
Page 88 of 257
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