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

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

   Note
   title Attention!
   The registers map is provided by the manufacturer. The register address is always less than the register number by 1. The register address is specified in the settings.

3. Set the Poll checkbox to start polling the Modbus Discret Register. This makes the settings available for editing.
4. From the Rule drop-down list, select the Modbus rule to which this Discret Register complies (see Configuring the Modbus Rule).
5. Set the Skip 'value changed' event checkbox, so that the Event Viewer window doesn't display the events of Discret Register value change.
6. Set the Skip indicator feature checkbox to disable the display of the Discret Register value on the map in text form.
   

   Note
   title Attention!
   Сhange of this parameter is applied after you restart the ACFA PSIM Server.

7. Set the Skip rule-configured events checkbox, so that the Event Viewer window doesn't display the events of rule triggering.
8. From the Interpretation drop-down list, select the Discret Register data format:
   • Single Flag,
   • 8 Flags (1 byte),
   • 16 Flags (2 bytes).
9. To add a numeric operation to the table, click the button.
   

   Info
   title Note
   To delete a numeric operation from the table, click the  button. You can change the sequences of operations using the following buttons: to move up one position, click the  button, to move down one position, click the  button.

10. From the list of operations, select:
    
    
    1. Inversion.
    2. Mask.
       In the Mask operation settings window:
       
       
       1. From the Mode drop-down list, select the logical operator AND (default), OR, or XOR. 
       2. Specify the bitmask value in decimal (DEC) or hexadecimal (HEX) format, or set the corresponding checkboxes.
       3. Click the OK button to save the settings.
11. Click the Apply button to save the settings.

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