Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
Protocol Configuration 615
Modbus RTU Slave Configuration
The Modbus configuration screen and configuration procedure are shown
below:
1. To set up Channel 0 and data files for Modbus communication,
select the Channel 0 Configuration tab.
2. Choose “Modbus RTU Slave” driver and assign driver characteristics.
3. Enter Modbus Data Table File Numbers. Select the Expansion check
box to utilize multiple holding register data files.
4. Enter the data table size and type for each required file. The data
table file(s) (not including the five additional tables if Expanded is
checked) will be created automatically.
NOTE
The controller default is one data file of 256 registers. The Expansion
check box enables an additional five files and 1280 holding registers.
The five additional tables do not need to be individually defined, but
sequentially follow the first integer or bit file. For example, if the first
file is N10 (or B10), then the additional five files will be N11 (or B11),
N12 (or B12), N13 (or B13), N14 (or B14), and N15 (or B15).
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes