oQencode Object

The oQEncode Object monitors the inputs to the two I/O lines specified by the IOLine1 and IOLine2 properties and will increment or decrement the Position property as the two inputs change.  The two inputs are expected to be connected to a quadrant encoder but any quadrant style inputs will enable the oQEncode Object to operate correctly. 

The oQEncode Object evaluates the two inputs as follows: The first Input line is used as a clock while the second I/O line is used as a direction input.  This results in a single count for each time the first input changes.  The direction of this count is determined by the state of the second input. If the second input is the same as the first, then the Position property is incremented.  If the second input is different than the first, then the Position property is decremented.  Each time the count changes, the Direction property is updated with the direction of the change and the Moved property is set.

The following table lists the properties of the oQencode Object:

Property	Description
Position	A value that indicates the position of the encoder. Object Class:  oWord   Value Range:  0 - 65535 Data Type:  Numeric   Default Value:  0 If the second input is the same as the first, then the Position property is incremented.  If the If the second input is different than the first, then the Position property is decremented.
Direction	A value that indicates the direction of the last movement. Object Class:  oLogic   Value Range:  0 - 1 Data Type:  Numeric   Default Value:  0 Value Description 0 The last change to the Position property was an increment. 1 The last change to the Position property was a decrement.
Moved	A value that indicates that the value has moved. Valid for 1 link list loop. Object Class:  oLogic   Value Range:  0 - 1 Data Type:  Numeric   Default Value:  0 A value that specifies if the count has moved.  This value is updated each time the oQEncode Object evaluates the inputs and therefore each time the Position property changes, the Moved property is set to cvTrue. In firmware B.x this value is valid for one link list loop. In firmware C.x this value is User-Cleared.
IOLine1	A value that specifies which I/O Line is connected to the encoder's first sensor. Object Class:  oIOLine   Value Range:  0 - 31 Data Type:  Numeric   Default Value:  0 Some I/O Lines have special purposes.  Be sure to see oIOLine help file for details.
IOLine2	A value that specifies which I/O Line is connected to the encoder's second sensor. Object Class:  oIOLine   Value Range:  0 - 31 Data Type:  Numeric   Default Value:  0 Some I/O Lines have special purposes.  Be sure to see oIOLine help file for details.
InvertD	A value that selects that the direction of the count is reversed. Object Class:  oSelect0to1   Value Range:  0 - 1 Data Type:  Numeric   Default Value:  0 Availability: Version B.2.0. Value Description 0 The Position property is incremented when the first input changes to the same state as the second input. 1 The Position property is decremented when the first input changes to a different state as the second input.
Operate	A value that selects whether or not the data is updated. Object Class:  oOperate   Value Range:  0 - 1 Data Type:  Numeric   Default Value:  0 Operate Constant Description 0 cvOff The operation is not performed. 1 cvOn The operation is performed.
Counter	The I/O function object used to count the movements. Object Class:  oCounter2L   Value Range:  0 - 65535 Data Type:  Numeric   Default Value:  0
Address	Returns a pointer to the address of the oCounter Object instance. Object Class:  oAddress   Value Range:  0 - 127 Data Type: Pointer (Read Only)   Default Value:  Address of Object

'This program reads an oQencode Object 'and outputs the value on I/O lines 8 - 15. Dim A As New oQencode Dim B As New oDIO8 Sub Main() ooPIC.PullUp = 1 A.IOLine1 = 8 A.IOLine2 = 10 A.Operate = cvTrue B.IOGroup = 3 B.Direction = cvOutput Do B=A Loop End Sub

B.1.0: Introduced.
B.2.0: InvertD property added.
C.1.0: Moved property changed to User-Cleared.

Bugs: No known bugs.