Added About this document section in the this Preface. Added details about client Modbus “Enum Bits” and “Numeric Bits” proxy points made available in build 3.5.26 or later (or AX-3.6 or higher), which affected sections NiagaraAX data representation, Types of Modbus client proxy points, and in reference topics for related proxy extensions ModbusClientEnumBitsProxyExt and ModbusClientNumericBitsProxyExt. Added details about client component to read function code 07 (exception status), which affected section Supported function codes, along with new sections About Modbus client exception status, and summary reference ModbusClientExceptionStatus. Updated document with newer style legal text.

Changed document to reference the new NiagaraAX Drivers Guide, which was created from information formerly found in the NiagaraAX User Guide.

Completely reworked what was formerly a “placeholder” document. Included are new main sections Modbus Quick Start, Modbus Meets NiagaraAX, and NiagaraAX Modbus Representation, along with numerous content changes in the Modbus Plugin Guides and Modbus Component Guides summary descriptions. Also added wasModbus terms in this Preface.