Below are the available basic data types:
| BOOL | Boolean (bit) - can be FALSE or TRUE - stored on 1 byte |
| SINT (*) | Small signed integer on 8 bits (from -128 to +127) |
| USINT (*) | Small unsigned integer on 8 bits (from 0 to +255) |
| BYTE | Same as USINT |
| INT (*) | Signed integer on 16 bits (from -32768 to +32767) |
| UINT (*) | Unsigned integer on 16 bits (from 0 to +65535) |
| WORD | Same as UINT |
| DINT | Signed integer on 32 bits (from -2147483648 to +2147483647) |
| UDINT (*) | Unsigned integer on 32 bits (from 0 to +4294967295) |
| DWORD | Same as UDINT |
| LINT (*) | Long signed integer on 64 bits |
| REAL (*) | Single precision floating point - stored on 32 bits |
| LREAL (*) | Double precision floating point - stored on 64 bits |
| TIME | Time of day - less than 24h - accuracy is 1ms |
| STRING (*) | Variable
length string with declared maximum length The declared maximum length cannot exceed 255 characters |
(*) Some of those data types may be not supported by all targets.