Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
532 Protocol Configuration
Modbus Commands
The controller configured for Modbus RTU Slave responds to the Modbus
command function codes listed in below:
Supported Modbus Commands as a Modbus RTU Slave
Command Function Code
(decimal)
Subfunction Code
(decimal)
Read Coil Status 1 -
Read Input Status 2 -
Read Holding Registers 3 -
Read Input Registers 4 -
Write Single Coil
(1)
(1) Broadcast is supported for this command.
5-
Write Single Holding Register
(1)
6-
Echo Command Data 8 0
Clear Diagnostic Counters 8 10
Write Multiple Coils
(1)
15 -
Write Multiple Holding Registers
(1)
16 -
Supported Modbus Commands as a Modbus RTU Master
Command Function Code
(decimal)
Subfunction Code
(decimal)
Read Coil Status 1 -
Read Input Status 2 -
Read Holding Registers 3 -
Read Input Registers 4 -
Write Single Coil
(1)
(1) Broadcast is supported for this command.
5-
Write Single Holding Register
(1)
6-
Write Multiple Coils
(1)
15 -
Write Multiple Holding Registers
(1)
16 -
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Allen-Bradley MicroLogix 1100 Specifications

General

Processor	32-bit
Programming Software	RSLogix 500
Mounting	DIN rail or panel mount
Power Supply	24V DC
Type	Compact PLC
Digital Inputs	12
Digital Outputs	8
Analog Inputs	4 (depending on model)
Analog Outputs	Optional with expansion module
Programming Language	Ladder Logic
Operating Temperature	0 to 55 °C (32 to 131 °F)
Series	MicroLogix