Publication 1763-RM001C-EN-P - October 2009
530 Protocol Configuration
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 to 4096 Read/Write Modbus Coil Data space Bit (B) or Integer (N) 3 to 255 bits 0 to 4095
10001 to 14096 Read-Only Modbus Contact Data space Bit (B) or Integer (N) 3 to 255 bits 0 to 4095
30001 to 30256 Read-Only Modbus Input Register space Bit (B) or Integer (N) 3 to 255 words 0 to 255
30501 to 30532 Modbus Communication Parameters Communication Status File - -
31501 to 31566 Read-Only System Status File space Status (S) 2 words 0 to 65
40001 to 40256 Read/Write Modbus Holding Register space Bit (B) or Integer (N) 3 to 255 words 0 to 255
40257 to 41280
(1)
Read/Write Modbus Holding Register space Bit (B) or Integer (N) 3 to 255 words 0 to 255 of
four Holding
Register files
41501 to 41566 Read/Write System Status File space Status (S) 2 words 0 to 65
41793 to 42048
(1)
Read/Write Modbus Holding Register space Bit (B) or Integer (N) 3 to 255 words 0 to 255 of
the last Holding
Register file
(1) These addresses only become active when specially configured for expanded holding registers.
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