Allen-Bradley MicroLogix 1400 Instruction Manual page 620

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618 Protocol Configuration
Modbus Slave to MicroLogix Memory Map - Detail
Modbus Addressing Modbus Address Reference
0001...4096 Read/Write Modbus Coil Data space
10001...14096 Read Only Modbus Contact Data space
30001...30256 Read Modbus Input Register space
30501 Modbus Data Table Coil File Number
30502 Modbus Data Table Contact File Number
30503 Modbus Data Table Input Register File Number
30504 Modbus Data Table Holding Register File Number
30506 Pre-Send Delay
30507 Modbus Slave Address
30508 Inter-character Timeout
30509 RTS Send Delay
30510 RTS Off Delay
30511 Parity
30512 Presentation Layer Error Code
30512 Presentation Layer Error Code
30513 Presentation Layer Error Count
30514 Executed Function Code Error
30515 Last Transmitted Exception Code
30516 File Number of Error Request
30517 Element Number of Error Request
30518 Function Code 1 Message Counter - Read Single Output Coil
30519 Function Code 2 Message Counter - Read Discrete Input Image
30520 Function Code 3 Message Counter - Read Single Holding Register
30521 Function Code 4 Message Counter - Read Single Input Register
30522 Function Code 5 Message Counter - Set/Clear Single Output Coil
30523 Function Code 6 Message Counter - Read/Write Single Holding Register
30524 Function Code 8 Message Counter - Run Diagnostics
30525 Function Code 15 Message Counter - Set/Clear for Block of Output Coils
30526 Function Code 16 Message Counter - Read/Write for Block of Holding Registers
30527 Modem Status
30528 Total messages responded to by this slave
30529 Total messages to this Slave
30530 Total Messages Seen
30531 Link Layer Error Count
30532 Link Layer Error
31501...31566 Read Only System Status File
40001...40256 Read/Write Modbus Holding Register space (1st Holding Register file).
Publication 1766-RM001A-EN-P - October 2008
Modbus Function Code (decimal)
1, 5, 15
2
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
3, 6, 16