Modbus Configuration
This page contains information on how the I/O modules are currently mapped in the Modbus process image and how the general Modbus register assignment is structured.
 
I/O Mapping
  Modbus Register [word addresses]
I/O Module Order Number input (RO) output (WO) output (RW) I/O access
1750-4xx24.0 - 24.7--RO
2750-4xx24.8 - 24.15--RO
3750-559/000-000-0 - 3512 - 515RO
4750-5xx-28.0 - 28.7540.0 - 540.7RO
5750-5xx-28.8 - 28.15540.8 - 540.15RO
6750-5xx-29.0 - 29.7541.0 - 541.7RO
7750-5xx-29.8 - 29.15541.8 - 541.15RO
8750-5xx-30.0 - 30.7542.0 - 542.7RO
9750-5xx-30.8 - 30.15542.8 - 542.15RO
10750-5xx-31.0 - 31.1543.0 - 543.1RO
11750-5xx-31.2 - 31.3543.2 - 543.3RO
12753-646/000-0000 - 114 - 15516 - 527RO
13753-646/000-00012 - 2316 - 27528 - 539RO

  Modbus Coils [bit addresses]
I/O Module Order Number input (RO) output (WO) output (RW) I/O access
1750-4xx0 - 7--RO
2750-4xx8 - 15--RO
3750-559/000-000----
4750-5xx-0 - 7512 - 519RO
5750-5xx-8 - 15520 - 527RO
6750-5xx-16 - 23528 - 535RO
7750-5xx-24 - 31536 - 543RO
8750-5xx-32 - 39544 - 551RO
9750-5xx-40 - 47552 - 559RO
10750-5xx-48 - 49560 - 561RO
11750-5xx-50 - 51562 - 563RO
12753-646/000-000----
13753-646/000-000----
 
General Modbus Mapping
  Input Register (FC3, FC4, FC23)
Modbus address Description
0x0000 - 0x00FFphysical input data
0x0100 - 0x01FFplc output variables data
0x0200 - 0x02FFphysical output data
0x0300 - 0x03FFplc input variables data
0x1000 - 0x2FFFspecial register data
0x3000 - 0x5FFFretain data
0x6000 - 0x62FBphysical input data
0x7000 - 0x72FBphysical output data
0x8000 - 0x8FFFretain data

  Output Register (FC6, FC16, FC22, FC23)
Modbus address Description
0x0000 - 0x00FFphysical output data
0x0100 - 0x01FFplc input variables data
0x0200 - 0x02FFphysical output data
0x0300 - 0x03FFplc input variables data
0x1000 - 0x2FFFspecial register data
0x3000 - 0x5FFFretain data
0x6000 - 0x62FBphysical output data
0x7000 - 0x72FBphysical output data
0x8000 - 0x8FFFretain data

  Digital Input (FC1, FC2)
Modbus address Description
0x0000 - 0x01FFphysical input data
0x0200 - 0x03FFphysical output data
0x1000 - 0x1FFFplc output variables data
0x2000 - 0x2FFFplc input variables data
0x3000 - 0x7FFFretain data
0x8000 - 0x85F7physical input data
0x9000 - 0x95F7physical output data

  Digital Output (FC5, FC15)
Modbus address Description
0x0000 - 0x01FFphysical output data
0x0200 - 0x03FFphysical output data
0x1000 - 0x1FFFplc input variables data
0x2000 - 0x2FFFplc input variables data
0x3000 - 0x7FFFretain data
0x8000 - 0x85F7physical output data
0x9000 - 0x95F7physical output data