52 Rockwell Automation Publication 856T-UM001B-EN-P - April 2021
Chapter 7 Message Structure and Configuration Example
Source Length: From Data Structure Tables
Use these tables to determine the source length that is based on the Service
Code that is used and the number of bytes being written.
Source Length= 2 bytes
Source Length= 2 bytes + Number of bytes of data being written
Source Length= 1 byte
Source Length= 1 byte + Number of bytes of data being written
Read Subindex (4B) Message Data Format:
Byte 0 Byte 1
Subindex Number Channel Number
Write Subindex (4C) Message Data Format:
Byte 0 Byte 1 Byte 2 Byte 3
Subindex Number Channel Number Data 0 Data 1
Read Index (4D) Message Data Format:
Byte 0
Channel Number = 1 byte
Write Index (4E) Message Data Format:
Byte 0 Byte 1 Byte 2 Byte 3
Channel Number Data 0 Data 1 Data 3
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