Address descriptions
- Last UpdatedSep 16, 2024
- 1 minute read
The address descriptions consist of the register type, its item name and the allowable range of values, the default data type, allowable suffixes (if any), and allowable access methods.
|
Register Type |
TwinCAT Version |
Item Name |
Description |
|
Memory(%M) |
2.x only |
%M |
Memory: Read and write data value in the memory area |
|
Output(%Q) Input(%I) |
2.x only 2.x only |
%Q %I |
Output: Read and write data value in the outputs area. Input: Read and write data value in the inputs area. |
|
Local or Global Variable |
2.x and 3.x |
NAME |
Variable Name: Up to 512 in the same device. See Max Block Size in the communication settings. |
|
Array Variable |
2.x only |
.VAR[0..10] |
Array Variable Name – the limit is the variable array size. This is supported only in one-dimensional arrays. |
Note: Communication with Windows-based TwinCAT runtime systems (e.g., Windows XP, CX1000, CX1020, Windows Embedded Compact) is possible only through Variable Names. Communication with a Beckhoff BC9000/BX9000 is possible only through the %M, %Q, and %I registers.