The SequenceBinary component provides sequenced weighted “staging” control of from 2 to 10 BooleanWritables based upon the status numeric In value (0—100). An adjustable delay time
is also provided. It can be used to support applications that need to sequence 2 to 10 loads or stages in a binary sequence.
Binary sequencing provides an analog to binary converter function that selects the outputs whose total load rating relates
directly to the control need. For each successive output, the output rating is twice the previous output.
A similar object is the SequenceLinear, which uses a rotating method (vs. weighted) for sequencing. SequenceBinary is available in the HVAC folder of the kitControl palette.
Table 9 illustrates how, by controlling 3 loads, eight unique levels of control can be achieved:
Table 9. Example SequenceBinary component
| Control Signal (In) % | OutC (4kw load size) | OutB (2kw load size) | OutA (1kw load size) | Stage Hysteresis |
|---|---|---|---|---|
| 100 | On | On | On | 14.3 |
| 85.7 | On | On | Off | 14.3 |
| 71.4 | On | Off | On | 14.3 |
| 57.1 | On | Off | Off | 14.3 |
| 42.9 | Off | On | On | 14.3 |
| 28.6 | Off | On | Off | 14.3 |
| 14.3 | Off | Off | On | 14.3 |
| 0 | Off | Off | Off | 14.3 |
Setup of the SequenceBinary object involves the following properties:
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Facets
Used to set the active and inactive text to be used for the Out properties.
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In
Input property that is used to determine the number of stages that should currently be On.
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In Minimum
Value of the input that produces all outputs off.
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In Maximum
Value of the input that produces all outputs on.
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Number Outputs
This object can be configured to support 2 to 10 outputs or stages.
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OutA - OutJ
These are status boolean values that can be used to control 2 to 10 loads. The number of outputs used is defined by the Number Outputs property.
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Delay
Defines the amount of time, in seconds, that must pass between changes in outputs. The default time is 0 seconds.
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On Delay Active
Boolean read-only property that indicates that the on delay timer is active.
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Off Delay Active
Boolean read-only property that indicates that the off delay timer is active.
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Desired Stages On
Read-only property that indicates the calculated number of stages that should be on based on the In property.
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Current Stages On
Read-only property that indicates the current number of stages that are currently on. Normally the Current Stages On and the Desired Stages On will be the same. They will be different when going through a transition and the delay timer is active.
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Next Stage On
Read-only property that indicates the next stage that will be turned on if needed.
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Next Stage Off
Read-only property that indicates the next stage that will be turned off if needed.
An example of a SequenceBinary property sheet is shown in Figure 43.
