Honeywell HC900 - Figure 79 Quadrature Function Block Example

Function Blocks
QDT Quadrature Function Block
302 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Properties Group Parameter Index # Parameter Description Value or Selection
Lower Range
Limit
4 Lower range limit of EU. Enter a value.
Control
Configuration
Quadrature
Mode
2
Resolution of counter. The quadrature
code produced by encoders has 4
state changes (edges) per quadrature
cycle (one per ¼ cycle). A 250 CPR
encoder has 250 cycles, (1000
pulses) per revolution. X1 decoding
means that the external electronics
pulses once per full cycle. X2 pulses
twice per cycle. X4 pulses every
quadrature state.
X1: One pulse per
cycle
X2: Two pulses per
cycle
X4: Four pulses per
cycle
Use Value
5
When FAIL is ON output is set to this
value.
Click to select,
enter a value.
Up scale
6
When FAIL is ON output is set to
Upper Range Limit.
Click to select.
Down scale
6
When FAIL is ON output is set to
Lower Range Limit.
Click to select.
Failsafe
HOLD
6 When FAIL is ON output is held. Click to select.
Example
Quadrature Function used to measure the output of an encoder
to determine the position of a traversing process.
Figure 79 Quadrature function block example