Note! This chapter does not apply to CANOnly.
The following functions are available:
• CLOSE and OPEN command (inputs):
- Is triggered by a positive edge followed by an active signal for at
least 100 Ms.
- The actuator stops and sets ALARM status if the OPEN signal is
activated during a CLOSE command, or the CLOSE signal is activated
during an OPEN command.
• CLOSED signal and OPEN signal (outputs)
• ALARM signal (output)
- Activated if GENERAL ALARM is triggered.
Figure 40: Digital control using buttons and lamps or PLC
As shown in the illustration above, actuators with the digital interface can
be controlled directly from a conventional panel with buttons/ switches and
indicator lamps. Alternatively, it can be controlled from a controller with
Digital inputs and outputs. This allows extended functionality in terms of
automatic control and visual user interface on display.
In case both the Close and Open signals are active simultaneously, the
actuator opens. Both input and output signals can use pulses of minimum
100ms length or constant signals.
The outputs provide feedback of the actuator’s status, such as Closed, Open
and/or Alarm.
The following failure scenarios trigger an alarm:
• Manual emergency operation
• Valve position out of defined operation area
• Valve blocked
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