Open Automation Software
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Siemens Address Syntax

Open Automation Software Tags can be defined to connect directly to Siemens controllers with the built in Siemens Driver Interfaces which support communications over Ethernet to S7-200, S7-300, S7-400, S7-1200, and S7-1500.

The following steps can be used to setup direct communications with Siemens controllers:

Syntax

Standard Types:

S7-200 Timer and Counter:

Data Block:

Memory Areas

S7-200

Memory
Area

Description

Bit
Access

Byte
Access

Word
Access

DWord
Access

I,
E

Discrete
Inputs and Image Register

R/W

R/W

R/W

R/W

Q,
A

Discrete
Outputs and Image Register 

R/W

R/W

R/W

R/W

M

Internal Memory
Bits

R/W

R/W

R/W

R/W

SM

Special
memory Bits

R/W

R/W

R/W

R/W

V

Variable
Memory

R/W

R/W

R/W

R/W

T

Timer
Current and Timer Bit

R/W
(T.Bit)

no

T.Current
R/W

no

C

Counter Current
and Counter Bit

R/W
(C.Bit)

no

C.Current
R/W

no

HC

High-speed
Counter

no

no

no

RO

AI

Analog
Inputs

no

no

RO

no

AQ

Analog
Outputs

no

no

RW

no

AC

Accumulator

no

no

no

no

L

Local
Variable Memory

no

no

no

no

S

SCR

R/W

R/W

R/W

R/W

 

S7-300, S7-400

Memory
Area

Description

Bit
Access

Byte
Access

Word
Access

DWord
Access

I,
E

Discrete
Inputs and Image Register

R/W

R/W

R/W

R/W

Q,
A

Discrete
Outputs and Image Register 

R/W

R/W

R/W

R/W

M,
F

Internal Memory
Bits

R/W

R/W

R/W

R/W

PI,
PE

Peripheral
Inputs

R/W

R/W

R/W

R/W

PQ,
PA

Peripheral
Outputs

R/W

R/W

R/W

R/W

DB

Datablock
Memory

R/W

R/W

R/W

R/W

 

S7-1200, S7-1500

Memory
Area

Description

Bit
Access

Byte
Access

Word
Access

DWord
Access

I,
E

Discrete
Inputs and Image Register

R/W

R/W

R/W

R/W

Q,
A

Discrete
Outputs and Image Register 

R/W

R/W

R/W

R/W

M,
F

Internal Memory
Bits

R/W

R/W

R/W

R/W

DB

Datablock
Memory

R/W

R/W

R/W

R/W

 

Data Width

Data
Width Specifier

Description

Bits

Supported
Data Types

X,
none

Bit

1

Boolean

B

Byte

8

SByte,
Byte, BCD8, String, Structured Types

W

Word

16

Int16,
UInt16, BCD16

D

DWord

32

Int32,
UInt32, BCD32, Single

 

Address

Address is controller family and model dependent. Consult controller documentation for valid ranges.

Bit

Data
Width Specifier

Description

Valid
Range

B

Byte

0..7

W

Word

0..15

D

DWord

0..31