Rockwell-automation AADvance Controller Configuration Guide Instrukcja Użytkownika Pobierz pdf (Strona 225)

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Document: 553633

ICSTT-RM405f-EN-P

Issue 07

9-39

Modbus Slave Commands

The AADvance controller supports a subset of Modbus standard command types.

Serial Port

Modbus slave serial port commands are available on only the AADvance controller

serial ports.

Diagnostics

Function: Diag

Function Code = 8

Address Offset: 0

Data Type: boolean

Fixed Length: 8

Varbyte length: 0

Purpose: Provides a series of tests for checking the communications system between a

client (master) and a server (slave).

Ethernet and Serial Port

Modbus slave Ethernet and serial port commands are available on the AADvance

controller Ethernet ports and serial ports.

Read Coils

Function: read

Function Code = 1

Address Offset: COIL_STATUS_ADDRESS

Data Type: boolean

Fixed Length: 8

Varbyte length: 0

Purpose: Reads from 1 to 2,000 contiguous status of coils in a remote device.

Read Discrete Inputs

Function: read

Function Code = 2

Address Offset: INPUT_STATUS_ADDR

Data Type: boolean

Fixed Length: 8

Varbyte length: 0

Purpose: Reads from 1 to 2,000 contiguous status of discrete inputs in a remote

device.

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Rockwell-automation AADvance Controller Configuration Guide Instrukcja Użytkownika Strona 225