Verifying that actions can be sent to a data point on a Modbus device - Modbus 4.1

Modbus Plugin Guide 4.1

series
Modbus 4.1
revised_modified
2020-05-06

You can create a property on a Modbus device by polling a single bit or bit range of a data point.

What you should know

  • The Modbus protocol can write to coils and holding registers, as they have read/write access. Discrete inputs and input registers have read-only access.
  • You cannot write to a specific bit in a holding register, as the protocol only supports writing to a complete register.

Procedure

  1. From the Config Tool home page, open the Plugins task.
  2. Select Modbus device from the entity browser, and click the Properties tab.
  3. In the Data Point section, select a Coil or Holding register and click the Write button.
  4. In the Write dialog box, select a value from the New value list, and click Write.

Results

If the write action is successful, a green check mark appears next to the New value list in the Write dialog box. If it is not successful, a red X appears next to the New value list in the Write dialog box.