Allen-Bradley MicroLogix 1400 Instruction Manual page 419

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Modbus Command
The controller supports eight Modbus commands. If the target device
supports any of these Modbus command types, the controller should be
capable of exchanging data with the device. Supported Modbus
commands include:
Modbus Command Types
Modbus Command
01 Read Coil Status
02 Read Input Status
03 Read Holding Registers
04 Read Input Registers
05 Write Single Coil
06 Write Single Register
15 Write Multiple Coil
16 Write Multiple Registers
Communications Instructions
Used For
reading bits
reading bits
reading words
reading words
writing 1 bit
writing 1 word
writing multiple bits
writing multiple words
Publication 1766-RM001A-EN-P - October 2008
417