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S7- SCL Structured Control Language

SCL

STEP 7

CFC

Libraries

Overview

GRAPH

Common project - data basis

SIMATIC S7

Siemens AG 2000. All rights reserved.

Date:
6.10.00
Filename:

HiGraph
Areas of application

ProAgent
ProTool / ProTool lite

The high-level language for
programming the
S7-300,
S7-400,
and C7

WinCC
Modular PID
Fuzzy Control
Standard PID
DOCPRO
TeleService
S7-PLCSim
S7-PDiag
CFC
S7-HiGraph

IF data processing THEN
S7-SCL;
END_IF;

PRODAVE

S7-Graph

M7-ProC/C++

S7-SCL

Borland C/C++
LAD/STL/FBD

S7-300/400

STEP 7
M7-SYS

M7-300/400

SIMATIC S7

Siemens AG 2000. All rights reserved.

Date:
6.10.00
Filename:
What is SCL?
SCL (Structured Control Language)
 Based on the language standard DIN EN-61131 Part 3 (int. IEC 1131-3)
 Similar to the Pascal programming language


SCL Commands

.
.
IF New_value<>Old_value THEN
index :=(index mod max_values) + 1;
measurement_values[index] :=INT_TO_REAL(measurement);
END_IF;
.
.

SIMATIC S7

Siemens AG 2000. All rights reserved.

Date:
6.10.00
Filename:
Customer Benefits


Language is easy to learn



Shorter program development time, easier to read programs



Simple formulation of complex algorithms



Supports the block and data-type concepts of S7



System integration into S7 languages, such as LAD, FDB and STL

SIMATIC S7

Siemens AG 2000. All rights reserved.

Date:
6.10.00
Filename:

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Scl 1e

  • 1. S7- SCL Structured Control Language SCL STEP 7 CFC Libraries Overview GRAPH Common project - data basis SIMATIC S7 Siemens AG 2000. All rights reserved. Date: 6.10.00 Filename: HiGraph
  • 2. Areas of application ProAgent ProTool / ProTool lite The high-level language for programming the S7-300, S7-400, and C7 WinCC Modular PID Fuzzy Control Standard PID DOCPRO TeleService S7-PLCSim S7-PDiag CFC S7-HiGraph IF data processing THEN S7-SCL; END_IF; PRODAVE S7-Graph M7-ProC/C++ S7-SCL Borland C/C++ LAD/STL/FBD S7-300/400 STEP 7 M7-SYS M7-300/400 SIMATIC S7 Siemens AG 2000. All rights reserved. Date: 6.10.00 Filename:
  • 3. What is SCL? SCL (Structured Control Language)  Based on the language standard DIN EN-61131 Part 3 (int. IEC 1131-3)  Similar to the Pascal programming language  SCL Commands . . IF New_value<>Old_value THEN index :=(index mod max_values) + 1; measurement_values[index] :=INT_TO_REAL(measurement); END_IF; . . SIMATIC S7 Siemens AG 2000. All rights reserved. Date: 6.10.00 Filename:
  • 4. Customer Benefits  Language is easy to learn  Shorter program development time, easier to read programs  Simple formulation of complex algorithms  Supports the block and data-type concepts of S7  System integration into S7 languages, such as LAD, FDB and STL SIMATIC S7 Siemens AG 2000. All rights reserved. Date: 6.10.00 Filename:

Notas do Editor

  1. Contents Page Areas of use2 What is S7 SCL ?3 Customer benefits4
  2. Areas of applicationComplex mathematical functions, e.g. regulatorsData managementProcess optimisationRecipe managementStatistics, mathematicsQuality controli.e.Programs with a lot of branches or loops Target systemsSIMATIC S7-300 and S7-400SIMATIC C7 DependenciesS7- SCL sits on top of STEP7 BasisS7- SCL is also required if project planning is done with the CFC for S7-300 or S7-400. IntegrationS7- SCL is integrated seamlessly into the STEP7 architecture, which means that both the data basis and the operating philosophy are identical. Anyone who is already familiar with STEP7 and knows a high-level programming language can be working with SCL after a very short familiarisation period.
  3. High level textual programming language SCL (Structured Control Language) is a high level textual programming language for the automation systems S7-300/400 and C7. The programming effort for complex calculations, algorithms, data management and data organisation in control technology can be simplified with the aid of SCL. Like PascalAs with Pascal, SCL offers all the advantages of a high level programming language. Besides a clear control structure and an extensive data concept, SCL also possesses other important concepts such as procedures and functions. This allows clear and easy to read programs can be developed. DIN EN-61131-3The DIN EN-61131-3 (int. IEC 1131-3) standard standardises the programming language for programmable controllers. The basis for SCL is the part ST &amp;quot;Structured Text&amp;quot;. SCL is the Siemens label for this language, since there are specific deviations from ST, as is documented by the Compliance chapter of the standard. A precise definition of the standards fulfilled can be found in the file NORM_TAB.WRI (German) or the file NORM_TBL.WRI (English) in the subdirectory you selected during SETUP (default setting: C:SIEMENSSTEP7 ).
  4. LearnabilitySCL is easy to learn if you have had some experience in a high level programming language, because the repertoire of available language constructs in SCL is oriented towards high level programming languages. Shorter Program development time The fact that the language is easy to learn means, among other things, that the program design time is reduced, and that the programs are easier to read. This also allows the costs for service and maintenance of program sections to be reduced. Complex Algorithms With the help of the language construct functions that are available in SCL, particularly complex algorithms, such as those that arise in closed loop control tasks or other recipes, are simple and efficient to formulate. Block Concept of S7 SCL particularly supports the block concept of STEP 7and therefore allows standard-compliant programming of all blocks(OB, FC, FB, DB, UDT) according to the norm DIN EN 61131-3 along with STL, LAD and FDB. System integration into STL, LAD, FDB and CFC Blocks that have been programmed with SCL can be combined with STL, LAD and FDB blocks. This means that blocks which have been programmed and tested in STL, LAD or FDB can be called up by SCL blocks. The reverse is also true, blocks written in SCL can also be called up by STL, LAD or FDB blocks. Naturally, blocks written in SCL can also be used in CFC.