Libraries; Library Types (Siemens And User-Defined) - Siemens SIMATIC S7 System Manual

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Libraries

Library types

Siemens provides two types of libraries with the installation of STEP 7-Micro/WIN SMART:

● Siemens-supplied (Modbus RTU (Page 476), Open User Communication (Page 498),

and USS protocol (Page 545))

● User-defined (Page 563) (libraries that you create from project POUs or obtain from other

You must have Administrator privileges to create a user-defined library. If you start

STEP 7-Micro/WIN SMART with a "Run as administrator" command, this provides the

sufficient privileges.

You cannot give a user-defined library the same name as a Siemens-supplied library.

Only call the library functions from either the main program or from interrupt routines, but not

STEP 7-Micro/WIN SMART makes communicating to Modbus devices easier by including

pre-configured subroutines and interrupt routines for Modbus communication through the

serial ports of the CPUs. With the Modbus RTU instructions, you can configure the S7-

200 SMART to act as a Modbus RTU master or slave device.

You can find these instructions in the Libraries folder of the Instructions folder in the project

tree (Page 111). When you put a Modbus RTU library instruction in your program,

STEP 7-Micro/WIN SMART automatically puts one or more associated subroutines and

interrupt routines in your project.

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

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