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Page 2 - Warranty and liability; Note; the

Warranty and liability Programming Guideline for S7-1200/1500Entry-ID: 81318674, V1.2, 03/2014 2 S ie m e n s A G 2 01 4 A ll ri g h ts re se rv e d Warranty and liability Note The Application Examples are not binding and do not claim to be completeregarding the circuits shown, equipping and any eve...

Page 3 - Table of contents

Table of contents Programming Guideline for S7-1200/1500Entry-ID: 81318674, V1.2, 03/2014 3 S ie m e n s A G 2 01 4 A ll ri g h ts re se rv e d Table of contents Warranty and liability ................................................................................................... 2 1 Preface ......

Page 5 - Preface; Aims for the development of the new SIMATIC control generation

1 Preface Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 5 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 1 Preface Aims for the development of the new SIMATIC control generation An engineering framework for all automation components (controller, HMI, drives, etc...

Page 6 - General terms using TIA Portal

2 S7-1200/1500 Innovations2.1 Introduction Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 6 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 2 S7-1200/1500 Innovations 2.1 Introduction In general, the programming of SIMATIC controllers has stayed the same from S7-3...

Page 7 - Global DB; Term; You will find further information in the following entries:

2 S7-1200/1500 Innovations2.2 Terms Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 7 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 2-2: Terms associated with tags and parameters FC / FB Global DB 1 2 3 4 Table 2-1: Terms associated with tags and parameter...

Page 8 - Programming languages; Programming language; planned; Optimized machine code; Advantages; step via STL; Properties

2 S7-1200/1500 Innovations2.3 Programming languages Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 8 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 2.3 Programming languages For the programming of a user program, various different programming languagesare availab...

Page 9 - SCL; Machine code; LAD; compiled in STL before the machine code is created.; Block creation

2 S7-1200/1500 Innovations2.5 Block creation Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 9 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 2-3: Machine code generation with S7-300/400/WinAC and S7-1200/1500 Machine code S7-300/400/WinAC S7-300/400/WinAC ...

Page 10 - Optimized blocks; the system and is independent of the declaration.; Standard block; block and smaller ones at the end.

2 S7-1200/1500 Innovations2.6 Optimized blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 10 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 2.6 Optimized blocks S7-1200/1500 controllers have optimized data storage. In optimized blocks, all tagsare automatical...

Page 11 - Byte are always read at once; Reserve

2 S7-1200/1500 Innovations2.6 Optimized blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 11 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 2.6.2 S7-1500: Setup of optimized blocks Figure 2-6: Optimized block of S7-1500 B y t e s Bits 0 1 2 3 4 5 6 7 W1 W2 B1...

Page 12 - Only the symbolic access exists for optimized blocks.; Best possible data storage in the processor on S7-1500; Bits; Standard

2 S7-1200/1500 Innovations2.6 Optimized blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 12 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Optimized blocks have a memory reserves for reloading in running operation (see chapter 3.2.7 Downloading without reini...

Page 13 - Recommendation; Always only use optimized blocks.; Example: Setting optimized block access; Table 2-4: Setting optimized block access; Step; Navigate to “Program blocks“.

2 S7-1200/1500 Innovations2.6 Optimized blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 13 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Recommendation Always only use optimized blocks. – They do not require absolute addressing and can always be addressed ...

Page 14 - Display of optimized and non-optimized blocks in the TIA Portal

2 S7-1200/1500 Innovations2.6 Optimized blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 14 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Step Instruction 3. This is where you see all blocks in the program and whether they are optimizedor not. In this overv...

Page 15 - Access types for optimized and non-optimized blocks; The following table displays all access types to blocks.; Symbolic; Conversion between optimized and non-optimized tags

2 S7-1200/1500 Innovations2.6 Optimized blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 15 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d The retentivity of tags of a global DB is defined directly in the global DB. Thedefault setting is non-retentive.The re...

Page 16 - Communication with optimized data; Compatible; Example; optimized

2 S7-1200/1500 Innovations2.6 Optimized blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 16 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 2.6.5 Communication with optimized data The interface (CPU, CM) transfers the data as they are arranged (no matter ifop...

Page 17 - Block sizes; (regardless of the main memory; DB; You will find further information in the following entry:; Elementary data types; Type; USint

2 S7-1200/1500 Innovations2.7 Block sizes Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 17 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 2.7 Block sizes For S7-1200/1500 controllers the maximum size of blocks was significantlyincreased in the main memory. Table...

Page 18 - Real; accurate to 7 decimal places; LReal; accurate to 15 decimal places; VARIANT data type

2 S7-1200/1500 Innovations2.8 New data types for S7-1200/1500 Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 18 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Table 2-9: Floating-point decimal data types Type Size Value range Real 32 bit (1 bit signs, 8 bit expon...

Page 20 - Instructions; CALCULATE; Figure 2-13: CALCULATE instruction with formula editor; Number of inputs is extendable; MOVE instructions

2 S7-1200/1500 Innovations2.9 Instructions Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 20 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 2.9 Instructions 2.9.1 CALCULATE With the CALCULATE instruction you can carry out mathematical calculations (e.g.(IN1 + IN2...

Page 21 - RUNTIME; NOTE

2 S7-1200/1500 Innovations2.9 Instructions Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 21 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Table 2-11:Move instructions Instruction Usage Properties MOVE Copy value Copies the content of the parameter at the IN inp...

Page 22 - Symbolic and comments; comments are visible even if networks are collapsed.; The following comments are possible:

2 S7-1200/1500 Innovations2.10 Symbolic and comments Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 22 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 2.10 Symbolic and comments Advantages You can make the code easy to understand and readable for your colleagues w...

Page 23 - // calculation of the filling level for medium tank; System constants; Figure 2-15: “System constants” in the user program

2 S7-1200/1500 Innovations2.11 System constants Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 23 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Example Filling level:= Radius * Radius * PI * height; // calculation of the filling level for medium tank 2.11 System...

Page 24 - Internal reference ID for controller and HMI tags; Figure 2-16: Internal reference ID for PLC and HMI; The ID will be invalid if ...

2 S7-1200/1500 Innovations2.12 Internal reference ID for controller and HMI tags Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 24 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 1. System constants of a controller can be found in the “PLC tags – Default tag table...

Page 25 - between controller, HMI and drive also remains unchanged.; PLC Tags; STOP mode in the event of errors; Error

2 S7-1200/1500 Innovations2.13 STOP mode in the event of errors Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 25 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Advantages You can rewire tags without changing internal relations. The communication between controll...

Page 27 - General Programming; Operating system and user program; Figure 3-1: Operating system and user program; Hardware; OB; Operating; FC; Program blocks

3 General Programming3.1 Operating system and user program Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 27 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3 General Programming 3.1 Operating system and user program SIMATIC controllers consist of operating system...

Page 29 - sequentially by OB number.; User program; from controller to controller, into several Main OBs.

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 29 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Depending on the controller a number of different OB types are available. Properties OBs are called by the operating system of...

Page 30 - Figure 3-4: Storing program parts in order in the project library; For further information, please refer to chapter 3.7 Libraries.; FCs are blocks without cyclic data storages.

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 30 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 3-4: Storing program parts in order in the project library For further information, please refer to chapter 3.7 Librari...

Page 31 - blocks are available.; times in different locations of the user program.; Call the FC with the circular segment calculation in any block (SCL).

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 31 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Temporary and out tags are undefined when called in non-optimized blocks. In optimized blocks, the values are always preset to...

Page 32 - Static tags keep the value from cycle to cycle

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 32 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.2.3 Function blocks (FB) Figure 3-6: “Add new block” dialog (FB) FBs are blocks with cyclic data storage, in which values ar...

Page 33 - Instances; Figure 3-8: Structure of the interfaces of an FB; Instance; created automatically when calling an FB.

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 33 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.2.4 Instances The call of a function block is called instance. The data with which the instance isworking is saved in an ins...

Page 34 - FB; Multi-instances are memory areas within instance DBs.; Use multi-instances in order to ...

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 34 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 3-9: Multi-instances Multi-instance DB FB Statics TOF_TIME FB Parameter FB Switch-on delay call Advantages Reusability ...

Page 36 - Figure 3-12: Global DB as central data memory; Downloading without reinitialization

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 36 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 3-12: Global DB as central data memory DB OB FC FB Local Advantages Well structured memory area High access speed Prope...

Page 37 - Figure 3-13: Downloading without reinitialization; controller stays in “RUN” mode.; Define a memory reserve for blocks that are to be expanded during

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 37 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 3-13: Downloading without reinitialization Name Tag1 Value 3.4 Tag3 Tag4 23 0 Name Tag1 Tag2 Value 3.4 451 Tag3 23 Tag5...

Page 38 - Example: Setting memory reserve in block

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 38 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Example: Setting memory reserve in block The following table describes how you can set the memory reserve for thedownloading w...

Page 39 - Example: Downloading without reinitialization; Download the block to the controller.; Reusability of blocks

3 General Programming3.2 Program blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 39 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Example: Downloading without reinitialization In the following example it is displayed how to download without reinitializatio...

Page 40 - user program is automatically created.; completed partial task within of the entire user program.; Block interface types

3 General Programming3.3 Block interface types Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 40 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d When every block receives an independent task, a clear and well-structured user program is automatically created. There...

Page 41 - Figure 3-15: Copying of the value to the input parameter; IN; Call-by-reference with InOut interface type; Storage concept; Block interfaces as data exchange

3 General Programming3.4 Storage concept Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 41 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 3-15: Copying of the value to the input parameter „My_int“ value: 31 FC / FB IN value: 31 Properties Each block displa...

Page 42 - universally and modularly.; Figure 3-17: Avoiding accesses to instance data blocks; Figure 3-18: Block interfaces for data exchange; Global memory

3 General Programming3.4 Storage concept Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 42 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Advantages Program can be made up modularly from ready blocks with partial tasks. Program is easy to expand and maintain. Pro...

Page 43 - address areas for different users.; Local memory; tags; temporary tags is shorter than for static ones.

3 General Programming3.4 Storage concept Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 43 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Advantages User programs can be used universally and independent from the hardware. The user program can be structured modula...

Page 44 - Access speed of memory areas; Access speed

3 General Programming3.4 Storage concept Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 44 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.4.4 Access speed of memory areas STEP 7 offers different options of memory accesses. For system-related reasonsthere are fa...

Page 45 - Retentivity; Controller; Retentivity can; only; be set for bit memory

3 General Programming3.5 Retentivity Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 45 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.5 Retentivity In the event of a failure of the power supply, the controller copies the retentive datawith its buffer energy fro...

Page 46 - Example: Retentive of PLC tags; Figure 3-23: Setting of the retentive tags in the table of PLC tags; Example: Retentive counter

3 General Programming3.5 Retentivity Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 46 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 3-21: Program editor (Functions block interfaces) Figure 3-22: Program editor (Data block) Example: Retentive of PLC tags ...

Page 47 - Symbolic addressing; Symbolic instead of absolute addressing

3 General Programming3.6 Symbolic addressing Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 47 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 3-24: Retentive counter as multi-instance NOTE If the retentive memory on the PLC is not sufficient, it is possibl...

Page 48 - Table 3-7: Example for creating symbolic tags; Open the program editor and open any block.

3 General Programming3.6 Symbolic addressing Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 48 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Recommendation “Don’t bother about the organization of the data storage“ “Think” symbolically. Enter the “descriptive” na...

Page 49 - ARRAY data type and indirect field accesses

3 General Programming3.6 Symbolic addressing Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 49 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Step Instruction 4. Define the tag. There is an elegant method to save time, if you want to define several tags in anetwo...

Page 50 - runtime

3 General Programming3.6 Symbolic addressing Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 50 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Figure 3-26: Indirect field access SCL: LAD / FBD: Advantages Simple access since the data type of the ARRAY elements is ...

Page 51 - STRUCT data type and PLC data types; Figure 3-27: Structure with elements with different data types

3 General Programming3.6 Symbolic addressing Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 51 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.6.3 STRUCT data type and PLC data types The STRUCT data type represents a data structure which is made up of elementsof...

Page 52 - Access to I/O areas with PLC data types; PLC data type

3 General Programming3.6 Symbolic addressing Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 52 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Note You will find further information in the following entries: How do you initialize structures into optimized memory a...

Page 53 - receive and send drive telegrams.; Slice access

3 General Programming3.6 Symbolic addressing Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 53 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Advantages High programming efficiency Easy multiple usability thanks to PLC data types Recommendation Use PLC data types...

Page 54 - Libraries; Types of libraries and library elements

3 General Programming3.7 Libraries Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 54 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.7 Libraries With the TIA Portal you can create independent libraries from different projectelements that can be easily reused. Ad...

Page 56 - Type concept; unwanted delete operations.; Types are always marked in the project for better identification; Differences for typifiable objects for controller and HMI

3 General Programming3.7 Libraries Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 56 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.7.2 Type concept The type concept allows the creation of standardized automation functions that youcan use in several plants or m...

Page 57 - Versioning of a block; Example: Creating a type

3 General Programming3.7 Libraries Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 57 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Further information on the handling of libraries can be found in the followingexample. 3.7.4 Versioning of a block Example: Creatin...

Page 58 - Example: Changing a type; Right-click the block in the “Project library” and select “Edit type”

3 General Programming3.7 Libraries Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 58 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Step Instruction 5. Optionally assign: Type name, version, author and comment and confirm thedialog with “OK”. 6. The subordinate P...

Page 59 - Add another input tag.

3 General Programming3.7 Libraries Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 59 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Step Instruction 2. Select which controller is to be used as test environment and confirm the dialogwith “OK”. If several controlle...

Page 60 - Click the “Release version” button.

3 General Programming3.7 Libraries Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 60 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Step Instruction 5. Click the “Release version” button. 6. A dialog box opens. Here you can store a version-related comment. Confir...

Page 61 - Process interrupts; Figure 3-33: Process interrupt is calling OB; Event; Figure 3-34: Configuring hardware interrupt

3 General Programming3.8 Process interrupts Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 61 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.8 Process interrupts The processing of the user program can be influenced by events such as processinterrupts. When you ...

Page 63 - Other performance recommendations

3 General Programming3.9 Other performance recommendations Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 63 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.9 Other performance recommendations Here you can find some general recommendations that enable faster pro...

Page 64 - SCL programming language: Tips and tricks; Using call templates; Table 3-11: Easy expanding of the call template; The editor automatically reduces the call template.

3 General Programming3.10 SCL programming language: Tips and tricks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 64 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.10 SCL programming language: Tips and tricks 3.10.1 Using call templates Many instructions of th...

Page 65 - The complete tag is replaced.

3 General Programming3.10 SCL programming language: Tips and tricks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 65 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.10.2 What instruction parameters are mandatory? If you are expanding the call template, the colo...

Page 66 - Efficiently inserting CASE instruction; No manipulation of loop counters for FOR loop; number of iterations.

3 General Programming3.10 SCL programming language: Tips and tricks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 66 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.10.4 Efficiently inserting CASE instruction With the CASE instruction in SCL, it will be exactly...

Page 67 - FOR loop backwards; Simple creating of instances for calls; Handling of time tags

3 General Programming3.10 SCL programming language: Tips and tricks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 67 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 3.10.6 FOR loop backwards In SCL you can also increment the index of FOR loops backwards or in ano...

Page 68 - ldt – ldt

3 General Programming3.10 SCL programming language: Tips and tricks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 68 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d The following table summarizes the overloaded operators and which operation isbehind it: Table 3-1...

Page 69 - Hardware-Independent Programming; Below is a list of all elementary data types and data groups.; Description

4 Hardware-Independent Programming4.1 Data types of S7-300/400 and S7-1200/1500 Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 69 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 4 Hardware-Independent Programming To make sure that a block can be used on all contro...

Page 70 - No bit memory but global data blocks; area that is not optimized for reasons of compatibility.

4 Hardware-Independent Programming4.2 No bit memory but global data blocks Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 70 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d Description S7 - 300/400 S7-1200 S7-1500 LDT (L_DATE_AND_TIME) Character type STRING Field ...

Page 71 - TRUE

4 Hardware-Independent Programming4.3 Programming of "clock bits" Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 71 C o p yr ig h t S ie m e n s A G 20 1 4 A ll ri g h ts re se rv e d 4.3 Programming of "clock bits" Recommendation For the programming of clock memory b...

Page 72 - The Most Important Recommendations

5 The Most Important Recommendations Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 72 S ie m e n s A G 2 01 4 A ll ri g h ts re se rv e d 5 The Most Important Recommendations Use optimized blocks – Chapter 2.6 Optimized blocks Structuring the program clearly and well – Chapter 3.2 O...

Page 73 - Related Literature; Topic

6 Related Literature Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 73 S ie m e n s A G 2 01 4 A ll ri g h ts re se rv e d 6 Related Literature Table 6-1 Topic Title \1\ Siemens Industry Online Support http://support.automation.siemens.com \2\ Download page of the entry http://suppor...

Page 74 - History; Version; version

7 History Programming Guideline for S7-1200/1500V1.2, Entry ID: 81318674 74 S ie m e n s A G 2 01 4 A ll ri g h ts re se rv e d 7 History Table 7-1 Version Date Modifications V1.0 09/2013 First version V1.1 10/2013 Corrections in the following chapters: 2.6.3 Best possible data storage in the proces...