6 User Guide
Modbus protocol disclaimer
The Modbus® protocol is an unsecured protocol and as such, the intended application of this
instrument should be assessed to ensure that these protocols are suitable before implementation.
To prevent any unauthorized accesses. always ensure that physical access to the instrument and
network is properly secured.
For cybersecurity reasons, ABB decided not to password protect the Modbus communication
protocol in LWT series instruments.
General deployment guidelines
• Limit and control physical access to the device and the network on which it is connected.
• Limit and control access to all Modbus communication tools.
• Use role-based access according to needs.
• Change all default passwords and strictly control their dissemination.
• Lock and/or write-protect the instrument whenever possible and/or practical.
• Disable Service access (from the Advanced access level; see “Disabling access to the Service account”
on page 43).
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