By Modbus Discrete Register, the Digital Input is meant. It is possible to only read the Digital Input by getting the real state of this input on sensor or device. The register size is 1 bit.

The Modbus Discrete Register is configured as follows:

  1. Go to the Modbus Discret Register object settings panel which is created on the basis of the Modbus Device object.

  2. In the Address field (1), enter the Discret Register address in the register map of this device.

    The register map is provided by the vendor.


  3. Click the Read value button (3) if it is necessary to read the device register.

    The Value area (2) displays the current Discret Register value in the selected format.


  4. Set the Auto update checkbox (4) if it is necessary to automatically read the register values with the interval specified on the Modbus Device object settings panel.
  5. From the Rule drop-down list (5), select the rule to which this Register will obey (see Configuring the Modbus Rule).
  6. Set the Value change checkbox (6) if it is not necessary to display the events on the register value change in the Event Protocol. 

  7. Uncheck the Indicator change checkbox (7) if it is necessary to allow displaying the register values in the plain text on the map.

    Value change of this parameter will be applied after restarting the ACFA-Intellect Server.


  8. Set the Config event checkbox (8) if it is not necessary to display the events in the Event Protocol when the rule is triggered.
  9. Click Apply (9) to save the changes.

The Modbus Discret Register is now configured.