Device | Bit Address | Word Address | 32 bits | Remarks
--- | --- | --- | --- | ---
Coil | 000001-065536 | 000001-065521 | or *1 |
Discrete Input | 100001-165536 | 100001-165521 | *2
Input Register | 300001,00-365536.15 | 300001-365536 | *2
Holding Register | 400001,00-465536,15 | 400001-465536 |

*1You can set the data storing order in 32-bit data word units and 64-bit data double-word units in the Device Setting dialog box.

*2Write disable

### IEC61131 Syntax Address Description

The following is a corresponding table for IEC61131 syntax and MODBUS syntax address descriptions.

Device | MODBUS Syntax | IEC61131 Syntax
--- | --- | ---
Format | 0-based | 1-based
Format | Range | First element | Range | First element | Range | First element
Coil | 000001+i | i = 0 to 65535 | 000001 | %Mi | i = 0 to 65535 | %M00000 | i = 1 to 65536 | %M00001
Discrete Input | 100001+i | i = 0 to 65535 | 100001 | - | - | - | - | -
Input Register (Word) | 300001+i | i = 0 to 65535 | 300001 | - | - | - | - | -
Input Register (Word bit) | 300001+i, j | i = 0 to 65535 j = 0 to 15 | 300001,00 | - | - | - | - | -
Holding Register (Word) | 400001+i | i = 0 to 65535 | 400001 | %MWi | i = 0 to 65535 | %MW00000 | i = 1 to 65536 | %MW00001
Holding Register (Word bit) | 400001+i, j | i = 0 to 65535 j = 0 to 15 | 400001,00 | %MWi:Xj | i = 0 to 65535 j = 0 to 15 | %MW00000:X00 | i = 1 to 65536 j = 0 to 15 | %MW00001:X00
Holding Register (Double word) | 400001+i | i = 0 to 65535 | 400001 | %MDi | i = 0 to 65535 | %MD00000 | i = 1 to 65536 | %MD00001
Holding Register (Float) | 400001+i | i = 0 to 65535 | 400001 | %MFi | i = 0 to 65535 | %MF00000 | i = 1 to 65536 | %MF00001
Holding Register (String) | 400001+i | i = 0 to k*1 | 400001 | %MWi | i = 0 to k | %MW00000 | i = 1 to k | %MW00001

*1k is equal to 65535 - string length / 2 rounded to the upper value. For instance with a 11 characters string we’ve got 65535 - 6 = 65529.

NOTE

- The addresses 100000 and 300000 cannot be accessed using IEC61131 syntax.
- If you apply IEC61131 syntax to a project which has a discrete input or input register already set, the addresses become invalid.
- Please refer to the precautions on manual notation for icons in the table.

Supported Devices Symbol and Terms

#### IEC61131 Syntax Address Mapping

Address mapping in BLUE is as follows. %MD and %MF use two sequential words form the specified address.