Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 226)

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9-40 Document: 553633
ICSTT-RM405f-EN-P
Issue 07
Configuration Guide (AADvance Controller)
Read Holding Registers
Function: read
Function Code = 3
Address Offset: HOLDING_REG_ADDR
Data Type: analogue
Fixed Length: 8
Varbyte length: 0
Purpose: Reads the contents of a contiguous block of holding registers in a remote
device.
Read Input Registers
Function: read
Function Code = 4
Address Offset: INPUT_REG_ADDR
Data Type: boolean
Fixed Length: 8
Varbyte length: 0
Purpose: Reads from 1 to 125 contiguous input registers in a remote device.
Write Single Coil
Function: write
Function Code = 5
Address Offset: COIL_STATUS_ADDR
Data Type: boolean
Fixed Length: 8
Varbyte length: 0
Purpose: Writes a single output to either ON or OFF in a remote device.
Write Single Register
Function: write
Function Code = 6
Address Offset: HOLDING_REG_ADDR
Data Type: analogue
Fixed Length: 8
Varbyte length: 0
Purpose: Writes a single holding register in a remote device.