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S7 data types
| S7 Data Type | Description | Address Range | Data Type |
| x | Bit | X0. b-X65534.b .b is Bit Number 0-7 | Boolean |
| B BYTE USINT | Unsigned Byte | X0. b-X65534.b .b is Bit Number 0-7 B0.b-B65535.b BYTE0.b-BYTE65535.b .b is Bit Number 0-7 | 8-bit unsigned integer Boolean |
| C CHAR SINT | Signed Byte | C0-C65535 CHAR0-CHAR65535 C0.b-C65535.b CHAR0.b-CHAR65535.b .b is Bit Number 0-7 | 8-bit unsigned integer Boolean |
| W WORD UINT | Unsigned double word | W0-W65534 WORD0-WORD65534 W0.b-W65534.b WORD0.b-WORD65534.b .b is Bit Number 0-15 | 16-bit unsigned integer Boolean |
| I INT | Signed Word | I0-I65534 INT0-INT65534 I0.b-I65534.b INT0.b-INT65534.b .b is Bit Number 0-15 | 16-bit signed integer Boolean |
| D DWORD UDINT | Unsigned double word | D0-D65532 DWORD0-DWORD65532 D0.b-D65532.b DWORD0.b- DWORD65532.b .b is Bit Number 0-31 | 32-bit unsigned integer Boolean |
| DI DINT | Signed double word | DI0-DI65532 DINT0-DINT65532 DI0.b-DI65532.b DINT0.b-DINT65532.b .b is Bit Number 0-31 | 32-bit signed integer Boolean |
| R REAL | IEEE Float | R0-R65532 REAL0-REAL65532 | Float |
- Note: Be cautious while modifying WORD, INT, DWORD, and DINT types, as each address starts at a byte offset within the device. Therefore, words MW0 and MW1 overlap at byte 1. Writing to MW0 will also modify the value held in MW1. Similarly, DWORD and long types can also overlap. It is recommended that these memory types should be used in such way that overlapping does not occur. As an example, DWORD MD0, MD4, MD8 … etc. can be used to prevent bytes from overlapping.