### DO/DI Proof The information below provides a FULL description of this microblock and all of its properties. What information you see and what you can do with it depends on your license and the application you are in, and in some cases, a controller's driver version.
Microblock family | Misc microblocks
Icon and symbol |
What it does | A 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.
#### Properties TIPS Alt+click any value in the WebCTRL® or Field Assistant interface to view property details, including its editing privilege and expression (location path) for use on graphics. You can right-click some properties in the EIKON® Property Editor and select Make editable or Make read-only to determine that property's functionality in your system.
Reference Name RefName | Use the default reference name unless you want a more descriptive name for graphics or network links. Limitations: lower case only limited to 40 characters cannot begin with a number must be unique within a control program
Editing Privilege | Preset - Each microblock property has an appropriate privilege or role assigned to it. You can use Global Modify in the WebCTRL® interface to find out what the actual privilege is. CAUTION If you change the Editing Privilege from Preset, the privilege you select will be used for all properties of this microblock, which is not always desirable.
Feedback Delay | You can set 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.
Debounce Time | 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.
Property Page Text
Show Property Page Text | Check to show this microblock's value on the equipment's Properties page.
Property Page Text | You can edit the microblock description that appears on the Properties page. See "Editing Properties page text using special characters" and "Formatting a microblock property" in EIKON® Help.