SIMATIC S7-SCL

Structured Control Language

Overview

Description
Design and functions
Licensing

Description

S7-SCL is particularly suitable for programming complex algorithms and arithmetic functions or for data processing tasks.. S7-SCL combines language elements known from high-level language programming, such as serial loops, alternative branching and branch distributors with language extensions typical for PLCs, such as addressing of inputs and outputs or start and querying of timers and counters.

S7-SCL corresponds to the textual high-level language ST (Structured Text) defined in the standard IEC 61131-3 and fulfills base level and reusability level requirements acc. to PLCopen.

Additional benefits over LAD, FBD, and STL:

Simpler, faster, and less error-prone program development thanks to the use of powerful language constructs such as IF...THEN...ELSE.
Easier to read, clearer structuring.
Simpler program test using a high-level language and a debugger.

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Design and functions

S7-SCL programs are programmed as ASCII sources. An exchange with other ASCII sources or targets is therefore possible. The S7-SCL editor offers various templates that only need to be filled in and inserted:

Templates for blocks (e.g. function blocks, data blocks) and their calls
Templates for block comments, block parameters and constants
Templates for control structures (IF, CASE, FOR, WHILE, REPEAT) that contain the exact syntax.

S7-SCL offers the following functionalities:

Language elements from programming in high-level languages, e.g. serial loops, alternative branches and branch distributors
S7-SCL-blocks can be used in other STEP 7 languages
PLC-typical language extensions, e.g. addressing of inputs and outputs, or start and scanning of timers and counters.

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Licensing

S7-SCL is part of the STEP 7 Professional Software package yet also available separately. Customers that already use STEP 7 can change to STEP 7 Professional by purchasing a POWERPACK. A valid STEP 7 license is needed for this upgrade. Software Update Service is offered for the STEP 7 Professional package as well.

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