DO/DI Proof
 Misc microblock

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The DO/DI Proof microblock verifies proper equipment operation by comparing the status of a digital input with the status of a corresponding digital output.
For example, the microblock can compare an input indicating the fan's on or off status with the output that turns the fan on or off. If the two inputs do not receive the same signal, the DO/DI Proof microblock provides two outputs that can be used to trigger alarms.
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Properties
Property
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Notes
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RefName
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Use the default reference name unless you want a more descriptive name for this microblock for graphics, source tree rules, or network links. All reference names in a control program must be unique.
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Activate alarm output if... (Feedback delay)
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In the Initial Values section, the Feedback delay setting allows you to specify an allowable delay between the time a digital output turns on and the time the digital input registers the new status. When the microblock's do input turns on, if the di input does not turn on by the time the feedback delay time expires, the alrm output turns on.
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DI must remain On or Off... (Debounce time)
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The Debounce time setting is the amount of time that the di input must remain on or off before it is considered valid. The debounce time should not be longer than the feedback delay; otherwise, an alarm will be generated each time the equipment starts.
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Property Page Text
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Enter a meaningful description of the microblock for use on the Properties page in WebCTRL.
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Editing Privilege
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Preset (the default Editing Privilege) indicates that each property in a microblock has an appropriate privilege assigned to it.
If you change the Editing Privilege, all the properties in that microblock are assigned to that one editing privilege, which is not always desirable.
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NOTE Alt+click any value in WebCTRL to view property details, including its expression and editing privilege.
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