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Appendix 1 – Syntax of S7-200 tag addresses

Chapter 8.

8. Appendix 1 – Syntax of S7-200 tag addresses

8.1 General tag address format

8.2 Memory types

Memory

Type Description

Acceptable

Modifiers Address

M Internal memory B, C, W, S, D, L, F Byte offset

SM Special memory B, C, W, S, D, L, F Byte offset

V Variable memory B, C, W, S, D, L, F Byte offset

C Counter W, S Object number

HC High Speed Counter D, L Object number

T Timer D, L Object number

AI Analog Inputs W, S Byte offset

AQ Analog Outputs W, S Byte offset

I Discrete Inputs B, C, W, S, D, L, F Byte offset

Q Discrete Outputs B, C, W, S, D, L, F Byte offset

Important: All addresses are always in BYTES (except for Counters and Timer that are objects).

Note: If no modifier is included, the modifier-type in bold will be used.

8.3 Modifiers

Modifier

Modifier type Value range Automatic tag type

B Byte 0...255 DWord

C signed Byte -128...127 Integer

W Word 0...65535 DWord

S signed Word -32768...32767 Integer

D DWord 0...4294967296 (**) DWord

L signed DWord -2147483648... 2147483647 (**) Integer

F Float +/- 3.4e38 Float

(**) Important: to avoid loss of precision due to integer to float conversion, choose the right

storage DataType for your Tag(s).

Polling Data Registers from Siemens S7-200 PLC Series (How to) Page 18/21

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Siemens S7-200PLC Manual de usuario Pagina 18