> For the complete documentation index, see [llms.txt](https://docs.monokot.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.monokot.io/tags-and-devices/siemens-connectivity/addressing.md).

# Addressing

For addressing a single value, use the following address format: 

```
AREA,DATA_TYPE START_BYTE, where AREA indicates the data area,
DATA_TYPE indicates the data type,
and START_BYTE indicates the starting byte of data
```

To address one of the bits of the data byte, you must use the following address format: 

```
AREA,X START_BYTE.BIT_INDEX, where AREA indicates the data area,
START_BYTE indicates the starting byte of data,
and BIT_INDEX indicates the bit number in a byte (from 0 to 7)
```

For addressing an array of values, use the following address format: 

```
AREA,DATA_TYPE START_BYTE[LENGTH], where AREA indicates the data area,
DATA_TYPE indicates the data type,
START_BYTE indicates the starting byte of data,
and LENGTH indicates the number of elements in the array
```

The table below maps data areas to supported address ranges, data types and access modes.

| **Data Area** | **Address Range** | **Data Type**                                                                                                                                          | **Access Mode** |
| ------------- | ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | --------------- |
| DB, M, Q, I   | 0 - 65535         | BOOL, BYTE, BYTE ARRAY, WORD, WORD ARRAY, INT, INT ARRAY, DWORD, DWORD ARRAY, DINT, DINT ARRAY, REAL, REAL ARRAY, CHAR ARRAY, DATETIME, DATETIME ARRAY | Read/Write      |

The following are examples of available addresses: 

* DB1,INT0
* DB7,DBX99.5
* M0,X0.1
* DB10,REAL2\[50]
* DB111,DT0
* I,X10.3
* Q,WORD4
* DB12,CHAR0\[6]