11.2 Positioner The positioner is activated via the bit ‘Remote SETPOINT’.
The positioner is a three-position-controller. Via the ‘NOMINAL’ position
(setpoint) in the data output, the nominal value of the position is transmitted
to the actuator as nominal variable.
For further information on the positioner refer to the operation instructions to
the actuator (multi-turn actuator SA(R) … / part-turn actuator SG . . . with
AUMATIC AC . . .).
11.3 Stepping mode Stepping mode requires a position transmitter (option).
The stepping mode extends the operating time for a part or the whole travel.
For further information stepping mode refer to the operation instructions to
the actuator (multi-turn actuator SA(R) … / part-turn actuator SG . . . with
AUMATIC AC ...).
12. Safety function The Poll connection is subject to an adjustable time monitoring within the
device. Within this time, a Poll command has to be received, otherwise the
connection changes to the timeout state. In case an I/O connection fails, the
AUMATIC can activate the safety function.
The time monitoring of the connection is defined via the value of the
Expected Packet Rate (EPR) attribute of the Connection Objects
(Class ID = 5, Instance ID = 2, Attribute ID = 9).
The safety function permits the start of safety operations in case of special
events, e.g. when the communication between the actuator and the master
is interrupted. This function can be set via the parameter
FAILURE
OPERATION
(refer to the operation instructions to the actuator (multi-turn
actuator SA(R) . . . / part-turn actuator SG . . . with AUMATIC AC ...).
If the actuator is in the safety mode, the set safety position is approached
via a safety operation. If the actuator is then moved to another position (e.g.
by manual operation), it will try to approach the set safety position while the
selector switch is in position REMOTE.
To prevent a new approach to the safety 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 safety function:
.
The connection to the master is interrupted.
.
The master changes to the IDLE mode and sends a POLL IDLE
command.
As soon as the cause for triggering the safety function is eliminated
(connection restored, POLL IDLE command is reset), the operation
commands from the DeviceNet master can be executed again.
The AUMATIC can only detect the failure of an I/O connec-
tion and activate the safety function if the time monitoring
was activated via the Expected Packet Rate (EPR).
The default setting of the time monitoring is deactivated (EPR = 0); only if
the master has changed this attribute to a value not equal 0, a time moni
-
toring of the connection is executed with the accordingly defined time.
If the failure of the Poll connection was determined with this function, the
actuator will stop even if the safety function is not activated.
40
Actuator controls AUMATIC AC 01.1 / ACExC 01.1
DeviceNet Operation instructions
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