Data Types - Siemens SIMATIC S7-400 Operating Instructions Manual

Configuration and operation

4.5 Data types

The symbol name is included in the NodeID of an item as part of the identifier, see section
Properties of the OPC UA server (Page 76).
Syntax of the symbol names
For the names of symbols to be used for OPC UA, the ASCII characters no. 32 .. 126
(0x20 .. 0x7e) are permitted.
ASCII characters are converted to the format UTF-8 in the server application of the CP.
Configuration of PLC tags / symbols for OPC UA applications
To be able to use PLC tags / symbols for OPC UA these are indicated as being "visible"
(STEP 7 V5) or "can be reached from HMI/OPC UA" (STEP 7 Professional)
Each PLC tag configured with this attribute is included in the maximum supported
configuration limits of the CP. Remember this particularly when configuring entire arrays.
4.5 Data types
Data types and memory areas
The CP 443-1 OPC UA supports the data types listed below for process data.
The corresponding symbols on the CPU are permitted for the operand areas listed. The
memory areas have the following abbreviations. The short forms in brackets are
abbreviations depending on the mnemonics set (German/English).
● I = Process input image (E/I)
● Q = Process output image (A/Q)
● PI = I/O area inputs (PE/PI)
● PQ = I/O area outputs (PA/PQ)
● M = Memory bit
● DB = Data block / system data block / instance data block
Note
I/O areas
I/O areas are only supported by the OPC UA server.
I/O areas are supported only when configuring with STEP 7 V5.
40
Operating Instructions, 01/2017, C79000-G8976-C427-02
CP 443-1 OPC UA