Base component for a solenoid valve digital order output and with two
 switches.

 The graphical symbol for this object is BaseComponent/MValve.
 For a valve without switches also MValveNoSwitches can be used.

 Default dynamics:
 - the valve symbol is filled with the original color when the valve is open.
 - colored white when the valve is closed.
 - colored gray when no switch is affected.
 - colored red when an error occurs.

 Default action:
 - the methods menu is opened with MB3.

 The current mode is displayed with the letters L (local) and M (manual).
 If no letter is displayed, the mode is auto.

 Auto or manual mode is selected from the object graph, with the buttons 'Auto'
 and 'Man'. The possibility to set the valve in manual mode might be disabled. In
 this case, the Auto/Man buttons are not displayed in the object graph.

 - Auto. The order output is controlled by the plc.
 - Manual. The order output is controlled by the operator, from the object graph.
   The valve is opened with the 'Open' button, and closed with the 'Close' button.

 If limit switches for open and closed position are available, they are matched
 against the order output. If a switch doesn't correspond to the order within
 a time limit, an alarm is sent.

 If you choose not to use the handling of modes in the object, but place this
 outside the object, it is important to reset the order at error status, i.e.
 you should reset the function object inputs at error, to avoid unwanted restarts.

Configuration

 - TwoSwitches            Switch open and switch closed.
 - SwitchOpen             Switch open.
 - SwitchClosed           Switch closed.
 - NoSwitches             No switches.

 Signals that should be connected to channel objects:

 - Order        Do
 - SwitchOpen   Di (optional)
 - SwitchClosed Di (optional)

 If the valve always should be controlled by the plc, the manual mode is
 disabled by setting Mode.OpAutoOnly to 1.

 For plc coding the function object BaseMValveFo is used.

 Create a function object in the plc editor and connect it to the current
 object with the connect function.

 For simulation of the valve, use the plc object BaseMValveSim.

• BaseMValveFo
• BaseMValveSim

 Super class.

 Enumeration for object graph configuration.
 Handled by the ConfigureComponent method.

 Digital output signal for order.

 Digital input signal for switch open.

 Digital input signal for switch closed.

 Mode object handling the Auto/Manual/Local modes.

 Delay for switch alarm in seconds.

 Alarm text for switch alarm.

 Indication for error.

 Indication for warning.

 External interlock.

 Enumeration for valve position (open, closed or in between).

 Supervision is disabled.
 Shows the input DisableSup in the plc Fo object.

 The plc function object connected to this object.
 This attribute is set when the function object is connected from
 the plc editor by the connect function.

 The simulate plc function object connected to this object.
 This attribute is set when the simulate function object is connected from
 the plc editor by the connect function.