Siemens S7-200 Bedienungsanleitung

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Micro System
SIMATIC S7-200
s
Two Hour Primer Edition 01/2000
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Inhaltsverzeichnis

Seite 1 - SIMATIC S7-200

Micro SystemSIMATIC S7-200sTwo Hour Primer Edition 01/2000

Seite 2

7Current Flow in the Ladder Diagram (1)In this example, output Q0.3 is active or "1", if the contact at I0.1 is closed, i.e. "1" (

Seite 3 - Contents

8Current Flow in the Ladder Diagram (2) (Using the Help Function)Help displays1 Markelement2. F1 F1 On-line-helpRevisionWhat you know already...- A F

Seite 4

9The PLC Cycle (1)All SIMATIC programmable controllers usually work in a cyclical manner. In this cyclical operation the switch statuses are read at t

Seite 5 - 2 Latching Revision

10The PLC Cycle (2)The outputs in the process-image output table (PIQ) are overwritten in accordance with the switching logic in the program. The stat

Seite 6 - Primer symbols

11The PLC Cycle (3)RevisionWhat you know already...- A Few Words of Revision- Here are the Bits- Current Flow in the Ladder Diagram- The PLC Cycle

Seite 7 - 4 Latching Revision

12RevisionNotesLatching RevisionPulse-Oper-ated SwitchOff-Delay TimerSequencer Appendix

Seite 8 - A Few Words of Revision

13IntroductionYou are sure to be familiar with the stan-dard latching function and here you will learn how to program it.The example:Output Q0.30 is t

Seite 9 - Here are the Bits

14 Normally-Closed (NC) Contact To allow the latching function to be termi-nated again, input I0.1 is to work like a break in the current path when

Seite 10 - Revision

15Normally-Closed (NC) Contact (2)LatchingLatching- Introduction- Normally-Closed (NC) Contact- Solution Description and Test- A Different Take on

Seite 11 - (Using the Help Function)

16Solution Description and TestAs in the contactor circuit, you have also switched a contact of the output (Q0.0) parallel to the tripping element (I0

Seite 12 - The PLC Cycle (1)

Safety GuidelinesThe Two Hour Primer was created as a quick introduction to the world of S7-200 andhas deliberately been kept short. It is not a subst

Seite 13 - The PLC Cycle (2)

17A Different Take on Latching ... (1)In PLC technology, latching is often also implemented in another variant: Instead of feeding back the output - a

Seite 14 - The PLC Cycle (3)

18A Different Take on Latching ... (2)You have already learned how to enter I0.0 and I0.1. Enter the set and reset coil as follows:LatchingLatching-

Seite 15

19Safety Aspects Shutdown if Wirebreak at Connection to S3Switch with NC contact that supplies the signal "0" when operated. In LAD, this si

Seite 16 - Introduction

20LatchingNotesLatching RevisionPulse-Oper-ated SwitchOff-Delay Timer Sequencer Appendix

Seite 17 - Off priority

21IntroductionYou will implement a pulse-operated switch here. Within this context, you will learn about edge detection and bit memories.Principle of

Seite 18 - Latching

22Solution OverviewBefore showing you the step-by-step solution of the task, we will show you the finished solution in order to provide you with an ov

Seite 19 - Solution Description and Test

23Edge Detection (1)The moment of transition of a contact (input, output ...)from "open" to "closed" or from "untrue" to

Seite 20

24Edge Detection (2)In our "Two-way Switch",is therefore used to pass on a signal to the subsequent logic operations only at the moment that

Seite 21

25Bit Memories (1)You require bit memories for the pulse-operated switch.A brief example will serve here to show you how to work with them.Instead of

Seite 22 - Safety Aspects

26Bit Memories (2)Now that you know the function of bit memories, you will be able to understand the solution of the pulse-operated switch.At this poi

Seite 23

71ContentsA Few Words of Revision Here are the BitsCurrent Flow in the Ladder Diagram The PLC Cycle5IntroductionNormally-Closed (NC) ContactSolution D

Seite 24

27Solution Descriptionand TestTo summarize, the function of our now complete program is explained again below using the example of the upper branch of

Seite 25 - Solution Overview

28Time to ShowWhat You Know... because you’ve made some real progress! ✔ Read and answer the questions below.✔ What is the cycle of a PLC?what are the

Seite 26 - Edge Detection (1)

29IntroductionIf S1 is switchedoff, the fan is to continue to run for 3 seconds Off-delay timer- Introduction- Save As ...- Insert Network- Soluti

Seite 27 - Edge Detection (2)

30Introduction Procedure1) First, load the complete latching circuit from our first example from the hard disk.2) Then, save the example under a n

Seite 28 - Bit Memories (1)

31Save As ...Off-delay timer- Introduction- Save As ...- Insert Network- Solution Description- Enter CommentsWe will use the latching circuit fro

Seite 29 - Bit Memories (2)

32Insert NetworkAn additional network is to be inserted in place of Network 2 so that we can imple-ment the off-delay timer. The following steps are r

Seite 30 - Solution Description

33Solution OverviewOff-delay timer- Introduction- Save As ...- Insert Network- Solution Description- Enter CommentsI0.0 activates Q0.0Q0.0 mainta

Seite 31 - What You Know

34Solution - Enter ProgramNetwork 1 must look like this:Enter the following program in Network 2:Off-delay timer- Introduction- Save As ...- Insert

Seite 32

35Solution DescriptionThis is how ourprogram functions. Ithas two active phases.Phase 1: Activation of the latching circuit, I0.0 is "1" (we

Seite 33

36Enter Comments (1)Off-delay timer- Introduction- Save As ...- Insert Network- Solution Description- Enter Comments82x?Title?Comments8OKWell don

Seite 34 - Save As

1PrefaceDear S7-200 user,Efficiency in the use of micro controllers depends primarily on how quickly and safely you can learn to use a controller. We

Seite 35 - Insert Network

37Enter Comments (2)After adding the comments, onlythe network title is visible onscreen.The comments can be madevisible again later by re-activating

Seite 36

38Time To Show What You KnowPlease read and answer the questions below.✔ How do you implement an off-delay timer? Draw the ladder diagram for two

Seite 37 - Solution - Enter Program

39IntroductionSequencerSequential control- Introduction- Basics- Working with Sequencers- Modification- Solution Description, Example- TestNow w

Seite 38

40Solution Starting PointFirst cycle SM0.1Motor protection I0.5Stop I0.0SequencerSequential control- Introduction- Basics- Working with Sequencers-

Seite 39 - Enter Comments (1)

41Basics (1)What is a sequencer control?• A control method in which a task is broken down into verysmall, usually sequential, subtasks (e.g. Motor on,

Seite 40 - Enter Comments (2)

42Basics (2)What is a transition condition?• Each step is started (activated) by a condition). The condition is usually derived from the states of the

Seite 41 - Time To Show

43Basics (3)The two program sections of a sequencer control:SequencerSequential control- Introduction- Basics- Working with Sequencers- Modificati

Seite 42

44Basics (4)1) Controlling the sequencer/making transitions in the sequencer2) Setting the outputs via the step flagsSequencerSequential control- Int

Seite 43 - Solution Starting Point

45Working with Sequencers (1)• A separate memory bit (step flag) is assigned to each step. This is "1" if the step is active.• For the sake

Seite 44 - Basics (1)

46Working with Sequencers (2)The transition condition is in practice also made up of several contacts.Our example can be expanded in such a way that,

Seite 45 - Basics (2)

2 Latching RevisionPulse-Oper-ated SwitchOff-Delay TimerSequencer Appendix

Seite 46 - Basics (3)

47Working with Sequencers (3)Advantages• The control section of the sequencer and the setting of the outputs are kept separate- If an output is now to

Seite 47 - Basics (4)

48Important Safety Points (1)The program section shown in the example must be at the end of the "normal" tran-sition conditions of the seque

Seite 48 - Sequencers (1)

49Important Safety Points (2)Program section 1 – Making transitions in the sequencer:Before assigning the first output d, the program section for acti

Seite 49 - Sequencers (2)

50ModificationSequencerSequential control- Introduction- Basics- Working with Sequencers- Modification- Solution Description, Example- TestNetwo

Seite 50 - Sequencers (3)

51Solution Description, Example (1)Program section 1 - Making transitions in the sequencerActivating step 1Step flag M0.1 is set when the sequencer is

Seite 51 - Important Safety Points (1)

52Solution Description, Example (2)Activating step 4Step flag M0.4 is set if the sequencer is at step 3 (M0.3 ="1") AND input I0.4 (initial

Seite 52 - Points (2)

53Solution Description, Example (3)Activating timer T37If step 1 is active (M0.1 = "1"), timer T37 is started.Activating timer T38If step 4

Seite 53 - Modification

54Solution Description, Example (4)Program section 2 - Setting the outputsActivate output Q0.0 (drive clockwise)Output Q0.0 is "1" in steps

Seite 54 - Example (1)

55TestYou can enter the program yourself or load the file "d05.prj" from the diskette. Please note that the stop switch I0.0 and the motor p

Seite 55 - Example (2)

56SequencerNotesLatchingRevisionPulse-Oper-ated SwitchOff-Delay TimerSequencer Appendix

Seite 56 - Example (3)

3ChapterText on a gray background prompts you to some action such as an input.This symbol shows you that the left mouse key must be clicked once for a

Seite 57 - Example (4)

57Made it.Now you can solve tasks yourself using the S7-200. If you want to implement complex contactor circuits, you can find some useful tips in the

Seite 58 - Sequencer

58 Latching RevisionPulse-Oper-ated SwitchOff-Delay Timer Sequencer Appendix

Seite 59

59Fancy Some More?You can find more examples in the "Samples" folder in your STEP 7-Micro/WIN folder or the "Tips & Tricks" fo

Seite 60

60 Latching RevisionPulse-Oper-ated SwitchOff-Delay Timer Sequencer Appendix

Seite 61 - 58 Latching Revision

61We have put together a few examples below to make it easy for you to imple-ment even complex "switching opera-tions" in ladder logic.Latch

Seite 62 - The SIMATIC contacts

62 Latching RevisionPulse-Oper-ated SwitchOff-Delay Timer Sequencer Appendix

Seite 63 - 60 Latching Revision

63Bridge CircuitIf you are changing over from contactor technology to PLC technology will very probably encounter switch combinations that cannot be c

Seite 64

64Diode CircuitWhen diodes have been used in "old" circuit diagrams converting them into ladder diagram terms is not an altogether simple ma

Seite 65 - 62 Latching Revision

65Changeover SwitchChangeover switches should likewise not cause you any problem when you are converting a circuit diagram into a ladder diagram. This

Seite 66 - Bridge Circuit

66NotesAppendixTipsNotes. A4Latching RevisionPulse-Oper-ated SwitchOff-Delay TimerSequencer Appendix

Seite 67 - Diode Circuit

4 Latching RevisionPulse-Oper-ated SwitchOff-Delay Timer Sequencer Appendix

Seite 68 - Changeover Switch

67Index A...IThis index contains the most important terms in programming the S7-200. You will find brief explanations of the abbreviations used in

Seite 69 - Appendix

68Index K...SIndexFor reference, cross references to manuals and abbreviations.$KLLadder diagram: 1h-& 25Ladder status: 7, 1h-& 26Latching

Seite 70 - Index A...I

69Index T...ZIndexFor reference, cross references to manuals and abbreviations.$TT37 (Timer): 29 +TERM: Position of the S7-200’s mode selector switch

Seite 71 - Index K...S

70ToSiemens AG Fax: +49 911 895-2786A&D AS MVMGleiwitzer Str. 55590475 NuernbergGermanyResponse to the "Two-Hour Primer"Dear user of the

Seite 72 - Index T...Z

72AppendixTipsNotes.

Seite 73 - A&D AS MVM/012000

5In addition, you were already able to pro-gram small logic operations yourself. You even learned to recognize timers in that short time.Compare with

Seite 74

6Here are the BitsThe smallest unit to be processed is the bit!The bit can assume two states:1) "1" meaning "bit set" or state is

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