ABB ACX Commissioning Instruction page 83

4. Confirm the information field by selecting <BACK>.
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Communication via the Modbus® TCP/IP protocol has now been released.
The Modbus® protocol is an unsecured protocol (in the meaning of IT security or
cybersecurity), as such the intended application should be assessed before
implementation to make sure that the protocol is suited.
CI/ACX-EN Rev. D ACX Analyzer System Commissioning Instruction 83