13. Failure function The failure function allows the start of failure operations in case of special
events, e.g. when the communication between the actuator and the master
is interrupted. This function is set with the parameters 6 to 9.
If the actuator is in the failure function, the set failure position is approached
via a failure operation.
If the actuator is then moved to another position (e.g. by manual operation),
it will try to perform the set failure action while the selector switch is in posi-
tion REMOTE.
To prevent a new approach to the failure position during
manual operation, the selector switch (local controls) must
be switched to position ‘LOCAL’ or ‘OFF’ before operating
the handwheel.
The following events can trigger the failure function:
.
The connection to the master is interrupted.
.
The master sends no telegrams to the actuator.
As soon as the cause for triggering the failure function is eliminated
(connection restored, master in Operate state), the operation commands
from the master can be executed again.
The last operation command having been transmitted to the
actuator prior to the connection failure is deleted within the
actuator. To ensure a defined behaviour, a valid operation
command must be transmitted to the actuator upon
resuming communication.
Time behaviour of the failure function
The internal connection control time (1 s) is started with the last Modbus
query-response cycle prior to communication failure.
If no valid Modbus telegram was received within this connection control
time, the failure function will be initiated with the start of the delay time. At
the end of the delay time, the failure action will be executed:
Last Modbus
Query-response cycle
End of the connection
control time (1s)
Start of the failure
function delay time
End of the failure
function delay time
(Parameter 7)
Executing the failure action
43
Actuator controls AUMA MATIC AM/ AMExB/ AMExC
Operation instructions Modbus
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