Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
Protocol Configuration 617
Modbus Slave Memory Map
The modbus Memory map is summarized in and detailed in :
Modbus to MicroLogix Memory Map - Summary
Modbus
Addressing
Description Valid MicroLogix Addressing
File Type Data File Number Address
0001…4096 Read/Write Modbus Coil Data space Bit (B) or Integer (N) 3…255 bits 0…4095
10001…14096 Read-Only Modbus Contact Data space Bit (B) or Integer (N) 3…255 bits 0…4095
30001…30256 Read-Only Modbus Input Register space Bit (B) or Integer (N) 3…255 words 0…255
30501…30532 Modbus Communication Parameters Communication Status File - -
31501…31566 Read-Only System Status File space Status (S) 2 words 0…65
40001…40256 Read/Write Modbus Holding Register space Bit (B) or Integer (N) 3…255 words 0…255
40257…41280
(1)
Read/Write Modbus Holding Register space Bit (B) or Integer (N) 3…255 words 0…255
of four Holding
Register files
41501…41566 Read/Write System Status File space Status (S) 2 words 0…65
41793…42048
(1)
Read/Write Modbus Holding Register space Bit (B) or Integer (N) 3…255 words 0…255
of the last
Holding
Register file
(1) These addresses only become active when specially configured for expanded holding registers.
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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