Base component for a directional valve with two solenoids.
 The valve is controlled with two digital order outputs.

 The buttons for increment and decrement in the object graph can be configure to show
 Incr/Decr, Up/Down, Forw/Back or Open/Close.

 There is no graphical symbol available for this object.

 The figure shows a configuration without manual control, i.e. the valve is
 always controlled from the ExtOrderIncr and ExtOrderDecr input in the function
 object. This is achieved by setting Mode.OpAutoOnly 1.

 The figure shows a scenario where valve is interlocked via the input ExtInterlock
 in the function object.

 @Mode
 The modes Auto/Man is handled by the mode object, CompModeD2M. See this object for
 more information.

Configuration

 -IncrDecr      Text of Incr/Decr buttons in object graph is Incr/Decr.
 -UpDown        Text of Incr/Decr buttons is On/Off.
 -ForwBack      Text of Incr/Decr buttons is Forw/Back.
 -OpenClose     Text of Incr/Decr buttons is Open/Close.

 Signals that should be connected to channel objects:

 - OrderIncr   Do
 - OrderDecr   Do

 For plc coding the function object BaseDirValveFo is used.

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

 A simulation object is not yet implemented.

• BaseDirValveFo

 Super class.

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

 The increment order output.

 The decrement order output.

 Mode object. Handles the auto and manual modes.

 Indication for warning.

 External interlock.

 Enumeration for valve position (closed, forward or reversed).

 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.