DOCA0036EN-14

Configuring Modbus TCP/IP Filtering

This function allows the administrator to create a whitelist and assign the level of access IP addresses have to the Com’X and its downstream devices.

When enabled, the default access level is Read for any Modbus TCP/IP client not in the filtered list. Setting the Default Access field to Noneblocks all Modbus TCP/IP clients not in the filtered list.

  1. Click Settings > Communication > Modbus TCP/IP Filtering.
  2. Click Yes to enable filtering.
  3. In the Whitelist column, enter the IP address you want to filter on.
    NOTE: An empty octet field is treated as a wildcard. Empty fields must begin with the least significant octet and be contiguous. The most restrictive filter is applied in cases of contradiction.
  4. Select the access level: None, Read, or Full.
  5. Optionally, you can edit the Default AccessRead or None.
  6. Click Save changes.
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