Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 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.