1766-RM001A-EN-P MicroLogix 1400 Programmable Controllers ...

Protocol Configuration 617Modbus Slave Memory MapThe modbus Memory map is summarized in and detailed in :Modbus to MicroLogix Memory Map - SummaryModbus DescriptionValid MicroLogix AddressingAddressingFile Type Data File Number Address0001…4096 Read/Write Modbus Coil Data space Bit (B) or Integer (N) 3…255 bits 0…409510001…14096 Read-Only Modbus Contact Data space Bit (B) or Integer (N) 3…255 bits 0…409530001…30256 Read-Only Modbus Input Register space Bit (B) or Integer (N) 3…255 words 0…25530501…30532 Modbus Communication Parameters Communication Status File - -31501…31566 Read-Only System Status File space Status (S) 2 words 0…6540001…40256 Read/Write Modbus Holding Register space Bit (B) or Integer (N) 3…255 words 0…25540257…41280 (1) Read/Write Modbus Holding Register space Bit (B) or Integer (N) 3…255 words 0…255of four HoldingRegister files41501…41566 Read/Write System Status File space Status (S) 2 words 0…6541793…42048 (1) Read/Write Modbus Holding Register space Bit (B) or Integer (N) 3…255 words 0…255of the lastHoldingRegister file(1) These addresses only become active when specially configured for expanded holding registers.Publication 1766-RM001A-EN-P - October 2008