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Valve outputs | Cyclical command value monitoring / emergency
operation
After a device reset (bus voltage return, ETS programming operation), the
command value objects first contain the value "0".
The state or emergency operation (active or inactive) is saved 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 emergency
operation, if the tracked state allows this.
The actuator makes the 1-bit status telegram "Command value fault" available. As
soon as a command value telegram is missing on a monitored valve output, and thus
emergency operation is activated, then the actuator transmits a fault signal via this
status object. The telegram polarity can be configured. Only after at least one com-
mand value telegram has been received for the monitored valve output does the ac-
tuator retract the fault signal for cyclical monitoring. Optionally, the fault telegram can
also be transmitted cyclically during active emergency operation.
Immediately after the bus voltage return or an ETS programming operation,
the object "Command value - Fault - Status" does not transmit the status auto-
matically. A faulty command value must be detected again (expiry of the mon-
itoring time without a command value telegram) for the object value to be
transmitted. This is also the case if a saved emergency operation was restored
after a device reset.
Enabling cyclical command value monitoring
Cyclical command value monitoring can only be used if it has been enabled in the
ETS.
￭
Activate the checkbox "Command value monitoring" on the "VOx - General -
Enable functions" parameter page. Configure the "Monitoring cycle" of the
command value monitoring.
Cyclical command value monitoring is activated. If there are no command
value telegrams during the monitoring cycle preset by the parameter of the
same name, then emergency operation is activated for the affected valve out-
put, for which the actuator sets a constant PWM command value. This com-
mand value is defined on the parameter page "VOx - General - Emergency op-
eration" by the parameter "Command value" (separately for summer and
winter if required).
￭
Deactivate the checkbox "Command value monitoring".
Cyclical command value monitoring is deactivated.
Configuring the fault signal for cyclical command value monitoring
If a command value fault is identified, then the actuator can optionally transmit a fault
telegram via the object "Command value fault".
￭
Set the parameter "Object polarity" on the parameter page "VOx - General -
Command value monitoring" to the required telegram polarity.
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Page 83 of 257
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