Rockwell-automation AADvance Controller Configuration Guide Manual de usuario descargar pdf (Pagina 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

Read coil status

Maximum 512 coils per message

Read input status

Maximum 512 inputs per message

Read holding registers

Maximum 125 registers per message

Read input registers

Maximum 125 registers per message

Force single coil

Preset single register

Write multiple coils

Maximum 512 coils per message

Write holding registers

Maximum 123 registers per message

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.

1 2 ... 185 186 187 188 189 190 191 192 193 194 195 ... 285 286

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