Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 190)

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Issue 07
Configuration Guide (AADvance Controller)
Modbus Master Command Set
The AADvance Modbus master supports the subset of Modbus commands listed in the
table.
Table 20: AADvance Modbus Master Commands
Command
Code Command Remarks
01 Read coil status Maximum 512 coils per message
02 Read input status Maximum 512 inputs per message
03 Read holding registers Maximum 125 registers per message
04 Read input registers Maximum 125 registers per message
05 Force single coil
06 Preset single register
15 Write multiple coils Maximum 512 coils per message
16 Write holding registers Maximum 123 registers per message
08 Diagnostics Subfunction 00, query used (RTU only)
Modbus Data Types and Addressing
The Modbus master supports the Modbus data types listed in the table.
Table 21: Modbus Data Types
Data Type Address Range
Coils 1 to 65,535
Inputs 1 to 65,535
Input registers 1 to 65,535
Holding registers 1 to 65,535
Modbus uses a numeric addressing scheme to pass data between devices. AADvance
controllers allocate a dedicated area for each of the four Modbus data types and follow
the model defined in the Modbus Application Protocol Specification.