Siemens Communication Driver

Siemens Communication Driver is intended for data connection between Reliance's runtime software and Siemens control systems through Ethernet. They are SIMATIC S7-200, S7-300, S7-400, S7-1200, S7-1500, and LOGO! The development environment allows you to import tags from the TIA Portal and STEP 7 development environments in the *.XLSX format and data structures from files containing structured text definitions in accordance with IEC EN 61131-3. Communication between the driver and devices is based on the request–response principle. The driver is launched by Reliance's runtime software at visualization project startup.

Starting up the driver

The communication driver is a DLL loaded into memory by the Reliance 4 Driver Server program, which can be launched either as a Windows service at Windows startup or as a standard application at the start of a visualization project. Information required to make a connection with devices is read from the visualization project. After reading this information, communication to all connected devices is activated.

Reading data

Data is read periodically or based on a one-shot request of Reliance’s runtime software. When reading periodically, the tag value is updated at a configured interval. One-shot reading is used for tag-controlled data reading. Communication packets are built dynamically according to data quantity requirements. Data writing is based on a one-shot request of the runtime software.

Supported data types

C-Counter

WORD

DB-DataBlock, M-Internal Memory

BOOL, BYTE, WORD, DWORD, INT, DINT, REAL, DATE, DATE AND TIME, S5TIME, TIME, TIME OF DAY, CHAR, STRING, ARRAY OF BOOL, ARRAY OF BYTE, ARRAY OF WORD, ARRAY OF DWORD, ARRAY OF INT, ARRAY OF DINT, ARRAY OF REAL

I-Discrete Inputs, Q-Discrete Outputs, PI-Peripheral Inputs, PQ-Peripheral Outputs

BOOL, BYTE, WORD, DWORD

T-Timer Values

DWORD

Structured data types can also be defined.

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