Siemens SIMATIC S7 400, SIMATIC S7 300 Application Description

Application for Control Technology

SIMATIC S7 CPU 300/400

Application Description

Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

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We accept no liability for information contained in this document. We do not accept liability, whatever the legal basis, for any damages

arising from the use of examples, notes, programs, configuration and performance data etc. described in this document, except where we are obliged to by the German Product Liability Act or in cases of willful damage or gross negligence, injury to life, body or health, breach of guarantee for the condition of products or items assumed by us, fraudulent concealment of a defect or breach of a substantial contractual obligation. However, claims arising from a breach of a condition which goes to the root of the contract shall be limited to the foreseeable damage which is intrinsic to the contract, unless caused by intent or gross negligence or based on mandatory liability for injury of life, body or health. The above conditions are not meant to change the burden of proof to the detriment of the user.

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The application examples do not purport to cover all details or variations in equipment, nor do they provide for every possible contingency. They are not customer-specific solutions. They are only intended to provide support for typical tasks. You are responsible for ensuring that the described products are used correctly. These application examples do not relieve you of the responsibility to use sound practices in application, installation, operation and maintenance. By using this application example you accept that Siemens is not liable for any damages except for those specified in the above liability clause. We reserve the right to make changes in these application examples at any time without prior notice. If there are any deviations between the recommendations provided in this application example and other Siemens publications – e.g. Catalogs – the contents of the other documents have priority.

For questions about this document please use the following e-mail address:

mailto:csweb@ad.siemens.de

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Foreword

Structure of the document

The documentation of this application is divided into the following main parts.

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Part Description

Part A1 gives you a general overview of the

A1

contents. You will learn about the components used (standard hardware and software and newly developed software).

The basic function data illustrate the powerful performance of this application.

Part A2 gives you a detailed description of the

A2

function processes of the hardware and software components. Read this part if you want to know what the functions do and how the solution components interact.

Part B takes you step by step through

B

installation and start-up of the application. Part C is of interest if you want to take the

C

software and expand or adapt it to your set-up.

Note

You can skip this part if you only want to test the application using step-bystep instructions.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Table of Contents

Part A1 : Application Description................................................................................ 7

1 Illustrate the performance of the entire applicationThe Automation

Problem - An Overview..............................................................................

8

2 Automation Solution .................................................................................... 12

2.1 Functionality in the S7-CPU............................................................................ 15

2.1.1 Absolute time switching functions...................................................................15

2.1.2 Relative time function ..................................................................................... 16

2.1.3 Additional functions......................................................................................... 16

2.2 Controlling and monitoring..............................................................................18

2.3 Standard components required ...................................................................... 21

2.3.1 Hardware components.................................................................................... 21

2.3.2 Software components..................................................................................... 21

2.4 Application software components required and their "product features" ........ 23

2.5 Installation with simple setup.......................................................................... 25

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3 Basic performance data............................................................................... 26

Part A2 : Function Mechanisms................................................................................27

4 Examples of Function Mechanisms............................................................ 28

4.1 Introduction..................................................................................................... 28

4.2 Overview of the Structure Elements ...............................................................28

4.3 STEP7 application level..................................................................................29

1.1.1 Absolute time switching functions...................................................................30

4.3.1 One-day time switch.......................................................................................31

4.3.2 Seven-day time switch....................................................................................32

4.3.3 One-month time switch................................................................................... 33

4.3.4 One-year time switch...................................................................................... 34

4.3.5 Relative time switch........................................................................................ 35

4.3.6 Additional functions......................................................................................... 38

Summer/wintertime changeover ................................................................ 38

Holiday recognition..................................................................................... 40

4.4 HMI System....................................................................................................41

4.4.1 Operation at the OP3......................................................................................41

1.1.2 Operation at the TP170A................................................................................ 43

Part B: Installation of the Sample Application.........................................................46

5 Installation of Hardware and Software ....................................................... 47

5.1 Hardware configuration................................................................................... 47

5.2 Software installation........................................................................................ 49

5.2.1 Loading the application software into the S7-CPU.........................................49

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5.2.2 Load the application software into the panel .................................................. 51

6 Using the Application................................................................................... 54

6.1 Application case 1: Many time switches........................................................54

6.2 Application case 2: Pulse chain..................................................................... 63

Part C: Program Description ..................................................................................... 70

7 STEP 7 Program............................................................................................ 71

7.1 Absolute time switches...................................................................................71

7.1.1 Seven-day time switch....................................................................................71

7.1.2 One-month time switch................................................................................... 71

7.2 Relative time switch........................................................................................ 73

1.2 Special functions............................................................................................. 74

7.2.1 Summer/wintertime changeover.....................................................................74

7.2.2 Holidays/special days..................................................................................... 75

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8 HMI Interface ................................................................................................. 77

9 Changes in the STEP 7 Programs............................................................... 77

9.1 What to do if a second time switch of the same type is needed?................... 77

9.2 How can I get several switch-on/off times into one time switch block?........... 78

9.3 What to do if more holidays or special days are needed?.............................. 79

9.4 How can I save on Instance DBs?..................................................................80

Appendix: Connection of the SICLOCK radio clock ............................................... 81

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A

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Preamble

Many systems in automation technology (e.g. in the field of Heating, Ventilation & Air Conditioning) require a control dependent on time of the day and day of the week. Apart from the time dependent control of certain processes, a monitoring and control function is also necessary for these time switch functions.

We take an everyday automation problem (see chapter 1) and present all required solution elements individually. The solution consists of standard SIMATIC components plus the software blocks developed especially for this application. The blocks are designed so that they can be used directly for concrete problems or they can be adjusted to an individual task by simple expansion/reduction.

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SIMATIC

Standard

+

pplikatio n

software

components

... Provid ed by you

This application offers a convenient and quick way to implement the "Time switch" key function. A HMI interface is provided allowing the operator to control the application.

... Delive re d with th e a pplicatio n

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Part A1 : Application Description

Objectives of Part A1

Part A1 of this document provides the reader with information on the following topics:

• Pinpoint the automation problem

• Design a possible solution

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1 Illustrate the performance of the entire applicationThe

Automation Problem - An Overview

Precise time tuning is necessary in many fields. Even in household technology for example, systems must work dependent on time of the day or day of the week. One possible solution for this problem are electrical and mechanical time switches. The following figure shows examples for electrical time switches:

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Fig. 1-1 Examples of time switches

These are all hardware clocks which enable solving the time switching problem for example in the field of household technology. These clocks are readily available in many DIY superstores. Operating the devices is so simple that a layperson can use this clock easily.

Apart from these “primitive applications”, time-dependent controls are also required in large areas of automation technology. Some “professional applications” are illustrated in the following table.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Table 1-1 Application examples for professional time switches

Application Illustration

Greenhouse control: Watering and lighting systems of a greenhouse must

be controlled.

Lighting control: Lighting systems are automatically controlled in

residential homes or hotels.

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Pump control: Pumps for heating of service water are automatically

controlled in residential homes.

Automatic feeding machine: Animals in a stable can be fed via automatic feeding

machines. Similar feeding machines are also available for example for aquariums.

Many industrial applications in the field of automation technology also require exact switching of processes. The problem is illustrated below:

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Monitoring and Control unit

S7-CPU

Protocol services

User program

Process area

Fig. 1-2 Problem layout for automation technology

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A block in the S7-CPU, which sets an output dependent of absolute time or which after a certain event lets a parameterized length of time pass, is required for the temporal design of these or similar processes.

The absolute switch-on and switch-off times for these processes must be configurable at a HMI system and subsequently be available in the S7CPU. Furthermore, it should be possible to parameterize a certain length of time which will pass dependent on a start event (relative time).

The S7-CPU and the HMI system are connected via MPI. In our example the absolute switch-on and switch-off times are entered at

the HMI system and subsequently compared with the absolute system time of the S7-CPU.

Note

The block principally also functions without HMI interface. Parameterization can be made directly at the input parameters.

Additionaly, the possibility of optionally connecting a radio-controlled clock to the automation system should be offered. This clock is supposed to synchronize the system time with the official time and to conduct the changeover from summer time to winter time and the other way round.

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This application was realized with the SIPLUS radio clock. Alternatively the SICLOCK radio clock can be used. This alternative is dealt with in detail in the appendix.

In case you do not want to use a radio-controlled clock the summer/ winter time changeover is automatically conducted at the officially fixed dates by a special function block which is delivered with this application. In this case the system time can certainly not be synchronized with the official time.

Basic data of the requirement

The requirements by the automation problem on the S7-CPU and the HMI interface are listed below:

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S7 CPU

• There are the following blocks:

- One-day, seven-day, one-month, one-year time switches

- Relative time switch

- Summer/wintertime changeover

- Holiday recognition

- Connection with radio-controlled clock

• Respectively one switch-on and one switch-off time can be

parameterized for the time switches (one-day, seven-day, one-month, one-year and relative time switch).

• Resetting the time switches must be simple.

HMI Interface User interface for the application for

• Input for current switch-on and switch-off times

• Controlling the sample application:

Starting / resetting time switches

• Display of current time switch status (on/off)

• Button for selecting mode of summer / winter time changeover: via radio-

controlled clock or via function block (delivered with the application)

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

2 Automation Solution

The automation problem described in chapter 1 can be solved with standard hardware and software components (SIEMENS) plus the user's own customized software.

The SIMATIC S7, together with a monitoring and control unit (SIMATIC OP/TP), is useful for executing the automation task.

Based on the used standard HW/SW components, as well as the compiled application software, data are exchanged between S7-CPU and HMI system via an MPI bus system.

Both the diagrams below give you an overview of all the components involved. Figure 2-1 shows you the standard components. Connecting the HVAC devices to the S7-CPU via the distributed I/O was not looked into in this application, and is thus only outlined schematically. Figure 2-2 shows you the user software developed for this application.

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Fig. 2-1 Standard hardware components

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Diagram of user software running on the standard components

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Fig. 2-2 User software

Description of the complete solution

Solving the task described in chapter 1 requires several blocks (see Chapter 2.1) for time-dependent setting or resetting of an output. In our solution the block parameter are input via an HMI-system (see Chapter 2.2).

However, the parameters can also be input directly at the block.

The application contains function blocks for absolute and relative time switch functions (clocks). Each clock has only one setting option (corresponding to a “cam”), i.e. only respectively one switch-on and one switch-off time can be entered at a block. This way of handling has many advantages:

• The function blocks are kept very fine-granular. This enables ideal usage

of the storage requirements of the S7-CPU.

• Flexible application of the blocks.

• Simple parameterization of the blocks.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Furthermore, the application contains additional functions such as summer/winter time changeover as well as taking holidays into consideration.

The additional function „Summer/winter time changeover“ is conducted by default by the FB103 „summer_winter“. Optionally this changeover can also be controlled by means of a radio-controlled clock. In this case a digital input module is necessary (i.e. SM321), as two digital inputs are required in order to receive the data sent from the clock module.

For each absolute or relative clock (corresponds to a function call of a function block) a view is used in the HMI system.

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HMI System

Fig. 2-3 Function scheme

S7-CPU

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

2.1 Functionality in the S7-CPU

The following blocks are available in the S7-CPU:

2.1.1 Absolute time switching functions One-day time switch:

This block can detect a time range within 24 hours, e.g. 8 to 12 o‘clock. These switch times are repeated daily.

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12:00 a.m

11:59:59 p.m

8:00 a.m. 12:00 p.m.

Fig. 2-4 Time range one-day time switch

Seven-day time switch:

This block can detect a time range within 7 days, e.g. each Tuesday from 8 o’clock p.m. to Friday 6 o‘clock a.m.. These switch times are repeated on a weekly basis.

Note: It is also possible to repeat a switch time daily from Monday to Friday.

So 12:00 a.m. Sa 11:59:59 p.m.

Di, 8:00 p.m.

Fr, 6:00 a.m.

Fig 2-5 Time range seven-day time switch

One-month time switch:

This block can detect a time range within 31 days, e.g. each month from

rd

the 3

r

3

, 12 o’clock p.m. to the 7th 21 o‘clock p.m..

s

1

12:00 a.m.

, 12:00 p.m. 7th , 9:00 p.m.

s

31

11:59:59 p.m.

Fig 2-6 Time range one-month time switch

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One-year time switch

This block can detect a time range within 365 days, e.g. from April 13 8 o’clock a.m. to September 28

s

1

Jan.

12

t

13

May, 8:00 28

Fig 2-7 Time range one-year time switch

2.1.2 Relative time function Relative time switch:

The clock is activated on a start signal and remains active until the parameterized time interval has elapsed.

th

12 o‘clock p.m..

t

Sept, 12:00

Parameterized time (e.g.: 3 hours)

th

s

31

Dec.

11:59:59 p.m.

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Start signal

Fig. 2-8 Relative time switch

2.1.3 Additional functions

• Summer/wintertime changeover:

The clock changes the absolute system time in the S7-CPU by plus or minus one hour, depending on whether the time changeover is from winter to summer time, or from summer to winter time.

For this changeover there are two alternatives:

1. Radio-controlled changeover (for this alternative you have to use the radio-controlled clock shown in figure 2-1): The system time is being synchronized after the clock connected to the system has sent the changeover signal.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

2. Program controlled changeover: The system time is being adjusted at the officially fixed dates by means of a function block which is included in this application.

• Holiday/special day recognition: Data for holidays and special days are stored in a DB in the format day/month/year. The block checks whether a day in this DB coincides with this current date, and sets an output to 1. Otherwise, the output is 0.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

2.2 Controlling and monitoring

The HMI system used in this case is an OP3 or alternatively a TP170A. Only a short overview is given here on operation. A detailed description on operation is given in Chapter 6.

The HMI page contains a view on each block in the S7-CPU. Inputs for the respective block are made via this view. The variables in the HMI system are connected with the correct memory space in the S7-CPU, so that inputs are at the correct location and can be evaluated in the S7 program.

Note

Information on setting the time in the HMI system via the S7-CPU or for setting the S7-clock via the HMI system are given on the [ProductSupportPages] under Entry ID 944136 (OP3) or Entry ID 2383397 (TP170A).

ProduktSupportSeiten

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

HMI with OP3

The OP3 is a text-based display of the lower performance range. A maximum of 2 lines at 20 characters each can be operated and monitored at once on the device.

An example (one-day time switch) of the HMI interface at OP3 is illustrated below.

The upper section of the illustration gives the input parameter, the lower section the output parameter.

Switch-o n tim e

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Switch-off time

Control

arameter

Error

Output

Details on

current

system time

Fig. 2-9 HMI interface for the one-day time switch at the OP3

Enable Clock: The parameter is used for enabling or disabling the clock.

Reset Output: The Reset parameter is used for resetting the output of the clock when problems occur.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

HMI with TP170A

The TP170A is a WindowsCE device of the lower performance range. A graphical user interface of 12 cm x 8 cm can be used for controlling and monitoring.

An example (one-day time switch) of the HMI interface at TP170A is illustrated below.

Switch-on ti m e Switch-off ti me

Controlarameter

Datails on

current

system time

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Output

Error

Fig. 2-10 HMI interface for the one-month time switch at the OP3

Enable Clock: The parameter is used for enabling or disabling the clock.

Reset Output: The Reset parameter is used for resetting the output of the clock when problems occur.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

2.3 Standard components required

2.3.1 Hardware components

The following hardware components are required to use the application.

Table 2-1 Hardware components required

Component MLFB Description

PS 307 6ES7307-1BA00-0AA0 or similar power supply CPU 315-2 DP 6ES7-315-2AG10-0AB0 or similar CPU PG740 PIII or equal PC OP3

or alternative

TP170A

6AV3 503-1DB10

6AV6 545-0BA15-2AX0

or similar HMI system

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Optional hardware components (required only when radio-controlled clock is to be used) :

Tabelle 2-2 Optional hardware components

Component MLFB Description

SM 321 6ES7 321-7BH00-0AB0

Radio receiver SIPLUS DCF77

6AG1057-1AA03-0AA0

2.3.2 Software components

The following software components are required to implement our example.

Table 2-3 Software components required

Component MLFB Description

STEP7 V5.2 6ES7810-4CC06-0YX0 ProTool V6.0 6AV6582-2BX06-0XA0

Windows NT 4.0 SP 6a

or alternative

or similar digital input module

or SICLOCK (see appendix)

Windows 2000 SP 2

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Optional software components (required only when a radio-controlled clock is to be used):

Tabelle 2-4 Optional software component

Component Description

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FB77 “DCF77_FB”

This standard function block has already been implemented in this application. It is required only when a radio-controlled clock is to be used.

Regardless of this application a STEP7 project including the function block FB77 is available at the following address:

http://www.ad.siemens.de/siplus/additions/html_00/doku mentation.shtml

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

2.4 Application software components required and their "product features"

This application was produced using the following application software components:

Table 2-2 STEP 7 application software

Serial No. Name Function description Technical data Ambient Conditions

1 Day (FB120)

2 Week (FB121)

3 Month (FB122)

4 Year (FB123)

The FB “DAY” checks, whether the current system time in the S7 CPU is within the parameterized time range at the input parameters of the block. If this is the case, the output is set to “1”. Otherwise the output is “0”.

The FB “Week” checks, whether current system time and current day of the week in the S7 CPU are within the parameterized time range at the input parameters of the block. If this is the case, the output is set to “1”. Otherwise the output is “0”.

The FB “Month” checks, whether current system time and current day in the month in the S7 CPU are within the parameterized time range at the input parameters of the block. If this is the case, the output is set to “1”. Otherwise the output is “0”.

The FB “Year” checks, whether current system time and current date in the S7 CPU are within the parameterized time range at the input parameters of the block. If this is the case, the output is set to “1”. Otherwise the output is “0”.

– Language STL – Storage

requirements: 610 bytes

– Instance DB: DB120

52 bytes

– Language STL – Storage

requirements: 4750 bytes

– Instance DB: DB121

48 bytes

– Language STL – Storage

requirements: 1054 bytes

– Instance DB: DB122

56 bytes

– Language STL – Storage

requirements: 956 bytes

– Instance DB: DB123

56 bytes

– S7-CPU – OB1

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Serial No. Name Function description Technical data Ambient Conditions

5 Relative (FB124)

The FB “Relative” sets the output to “1”, if at the input “Enable” a positive edge is identified. The output stays on “1” until the parameterized time has elapse. Additionally it can be parameterized, whether the parameterized time restarts at any positive edge, or whether only the first edge change is reacted to.

6 Summer_winter (FB103)

The FB “Summer_winter” changes the current system time in the S7CPU by plus or minus 1 hour, depending on whether the time changeover has occurred from winter to summer or from summer to winter time

– Language STL – Storage

requirements: 598 bytes

– Instance DB: DB124

58 bytes

– Language STL – Storage

requirements: 382 bytes

– S7-CPU – OB1

– Instance DB: DB103

44 bytes

7 Holidays (FC100)

The FC “Holidays” checks whether a date stored in this checked DB coincides with the current system date in the S7-CPU and sets its output to “1” accordingly.

– Language STL – Storage

requirements:

– S7-CPU – OB1

310 bytes

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2.5 Installation with simple setup

The entire application software available for downloading has been compressed in the “timefunc.exe” file. Copy the “timefunctions.exe“ file to a separate folder and launch by double clicking on it. The project is automatically extracted into the specified path including all respective subdirectories. Subsequently the extracted STEP7 project can be opened with the SIMATIC Manager.

S7 project name

OP3-

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TP170A project

Fig. 2-11 SIMATIC Manager

The project contains both ProTool projects for OP3 and TP170A. They can be opened by double click in the SIMATIC Manager, providing ProTool has been installed on the computer.

The hardware components for the S7 station may have to be adjusted in the STEP7 project (if you are using different hardware components from those given here) and is then be loaded into the S7 CPU.

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3 Basic performance data

The basic data for the S7 blocks are available in the following table:

Table 3-1 Basic data for the function blocks

One-day

time

switch

No. Input

parameter

3 2 24h 1 1s 23:59:59

No. Output

parameter

Cycle

No. Time intervals

Smallest

settable

interval

Largest

settable

interval

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Seven-day

time

switch

3 2

7

days

1 1s

6 days,

23:59:59

One-

month

time

3 2

31

days

1 1s

30 days, 23:59:59

switch

One-year

time

3 2

switch

Relative

time

5 2 - 1 1s

switch

365

days

1 1s

364 days,

23:59:59

23 days, 23:59:59

The basic data for the radio receiver SIPLUS DCF77 are as follows:

Table 3-2 Basic data for the radio receiver

Radio frequency 77,5kHz Protection class IP65 Dimensions

(W x H x D) 75 x 125*) x 75 mm

*) plus 25mm für screw connection plus bending radius for cable

Voltage feed 24Vdc (20,4 ... 28,8Vdc) Current consumption 50mA (typ.)

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Part A2 : Function Mechanisms

Objectives of Part A2 :

Part A2 of this document provides the reader with information on the following topics.

• Explanation of all function elements

• Description of the components which are easy to integrate in your own

applications

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

4 Examples of Function Mechanisms

4.1 Introduction

What will you find here?

Every hardware, standard and user software component is examined separately and their functions described.

What can you do with it?

The example contains some (partial) solutions around the “time switching in the S7” subject. With minor adjustments you can use them as the basis for your own requirements.

4.2 Overview of the Structure Elements

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Figure 4-1 illustrates all function units of this application. They are described one by one in the following chapters.

HMI Unit

S7-CPU

Program

OB1/TimeOB

Call of th e re s p . FB with the respective Instance DB, call o further blocks for program procedure

User interface

calls

connected via

further processed

Data interface in Instance DB

“Time function“

Input parameter

Output parameter

Chapt. 4.4

displayed

Chapt. 4.3

feeds back

Process

Fig. 4-1 Structural layout of the application

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

4.3 STEP7 application level

Fig. 4-2 “STEP7 program overview“ gives you all the various elements of the STEP7 program. The individual blocks are described in more detail in the following sub-chapters.

Note

If certain blocks are not required, these can be removed from the displayed program structure. This does not affect other blocks (“modular principle of individual functions”).

Note

The function blocks have an exemplary, given numbering which can be changed.

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OB1

(Chapter 4.3.3.1)

call summer

callcheck_holidaysFC100

callday FB120

call weekFB121

call monthF B122

call yearFB123

call relativ FB124

winterFB103 FB103

(Kapitel 4.3.3.1)

prüfe, ob Sommer-/Winterzeit-

check whether summer/winter

umschaltungstattge funden hat

time changeover occurred

(Chapter 4.3.3.2)

(Kapitel 4.3.3.2)

FC100

prüfe, ob aktuelles Datum ein

check whether current date is

Feiertag oder Sonderta g ist

holiday or special day

(Chapter 4.3.1.1)

(Kapitel 4.3.1.1)

FB120

prüfe, ob aktuelle Zeit impara-

check whether current time is

metrie r t e n Ze it raum liegt

within parameterized range

(Chapter 4.3.1.2)

(Kapitel 4.3.1.2)

FB121

prüfe, ob aktuelle Zeit impara-

check whether current time is

metrie r t e n Ze it raum liegt

within parameterized range

(Chapter 4.3.1.3)

(Kapitel 4.3.1.3)

FB122

prüfe, ob aktuelle Zeit impara-

check whether current time is

metrie r t e n Ze it raum liegt

within parameterized range

(Chapter 4.3.1.4)

(Kapitel 4.3.1.4)

FB123

prüfe, ob aktuelle Zeit impara-

check whether current time is

metrie r t e n Ze it raum liegt

within parameterized range

FB124

(Chapter 4.3.2)

(Kapitel 4.3.2)

prüfe, ob aktuelle Zeit impara-

check whether current time is

metrie r t e n Ze it raum liegt

within parameterized range

DB103

InstanzDB zu FB103

InstancDB to FB103

DB100

DB with holiday/special days

DB mit Feier- und Sonderta gen

DB120

InstanzDB zu FB120

Instance DBto FB120

DB121

InstanzDB zu FB121

InstancDB to FB121

DB122

InstanzDB zu FB122

InstancDB to FB122

DB123

InstanzDB zu FB123

InstancDB to FB123

DB124

InstanzDB zu FB124

InstancDB to FB124

Additional functions

Absolute

ime switching functions

Relative

ime switching function

Fig. 4-2 STEP7 program overview

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4.3.1 Absolute time switching functions

The absolute time switching functions include

• One-day time switch

• Seven-day time switch

• One-month time switch

• One-year time switch

Each of the blocks has the following inputs:

• EnableClock of “BOOL“ type Value = 1: Clock enabled Value = 0: Clock not enabled

• Time_To_Check of “UDT“ type The parameter contains the time range in which the clock is to be active, with absolute switch-on and switch-off time. The parameter is specific for each time switch

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Important

!

For the one-week time switch, the parameter “Time_To_Check“ is an in/out parameter!

• Reset of “BOOL“ type Value = 1: Clock is reset Value = 0: Clock runs in “Normal operation”

Each of the blocks has the following outputs:

• Q = clock active of “BOOL“ type The parameter indicates whether the clock is active. Value = 1: Clock is active Value = 0: Clock not active

• Error of “INT“ type Value = 0: No error has occurred Value <> 0: An error has occurred

possible errors:

Return value of called SFCs in the block (e.g. SFC1 “Read_Clk“) 8000h at limit value violation at the input parameters 8001h if switch-on time equal switch-off time

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Note

The input parameter ”EN” and the output parameter “ENO” are default parameters at the S7 blocks. Closer information is available in the documentation and the STEP7 online help.

Note

The time switching functions are discussed in detail below. The only different parameter here is “Time_To_Check“ of the “UDT“ type, whose parameterization is always given. All other parameters have the same structure for all different time switching functions.

The Start and Reset parameters are subsequently referred to as control parameters.

The following pulse diagram illustrates how the behavior of the input signals “ReleaseClock“, “Time_To_Check“ and “Reset“, and the output “Clock active“ relate to each other:

ime range

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t is a programmed time range (time switch active)

Fig. 4-3 Pulse diagram

Note

The pulse diagram (Fig. 4-3) applies for all absolute function blocks, which are described in detail below.

4.3.2 One-day time switch

The block for the one-day time switch “day” FB120 is parameterized as illustrated in the figure below. Data block DB120 is used as instance data block:

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Fig 4-4 Configuration “one-day time switch”

Basic data/parameterizability:

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RAM requirements: day: 760 bytes Instance DB: 52 bytes The parameter “Time_To_Check“ is a structure of the “day_udt“ (UDT1)

type. It contains:

• Start hour, start minute, start second summarized as “starttime” with structure of the “times” (UDT6) type

• End hour, end minute, end second summarized as “endtime” with structure of the “times” (UDT6) type

4.3.3 Seven-day time switch

The block for the seven-day time switch “week” FB121 is parameterized as illustrated in the figure below. Data block DB121 is used as instance data block:

Fig 4-5 Configuration “seven-day time switch”

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Basic data/parameterizability:

RAM requirements: week: 4750 bytes Instance DB: 48 bytes The parameter “Time_To_Check“ is a structure of the “week_udt“ (UDT2)

type. It contains:

• Start day 1 to 7: Sunday to Saturday 8: Monday to Friday 9: Saturday to Sunday

• Start hour, start minute, start second summarized as “starttime” with structure of the “times” (UDT6) type

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• End day 1 to 7: Sunday to Saturday 8: Monday to Friday 9: Saturday to Sunday

• End hour, end minute, end second summarized as “endtime” with structure of the “times” (UDT6) type

If the parameter “Start day” has a value between 1 and 7, only a value between 1 and 7 must be input at the end day as well. If the parameter “Start day” equals 8 or 9, only 8 or 9 must be input at the end day as well.

4.3.4 One-month time switch

The block for the one-month time switch “month” FB122 is parameterized as illustrated in the figure below. Data block DB122 is used as instance data block:

Fig 4-6 Configuration “one-month time switch”

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Basic data/parameterizability:

RAM requirements: month: 1204 bytes Instance DB: 56 bytes The parameter “Time_To_Check“ is a structure of the “month_udt“ (UDT3)

type. It contains:

• Start day 1 to 31: corresponds to day in month 32: Last day in month

• Start hour, start minute, start second summarized as “starttime” with structure of the “times” (UDT6) type

• End day 1 to 31: corresponds to day in month 32: Last day in month

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Note

When parameterizing start day and end day, it must be taken into account that not every month has 31 days. If a function is to be executed at or until or from the last day of the month, a 32 must be entered instead of 28, 30 or 31. The block checks the current month and automatically sets the end day to the last day of that month.

• End hour, end minute, end second summarized as “endtime” with structure of the “times” (UDT6) type

4.3.5 One-year time switch

The block for the one-year time switch “year” FB123 is parameterized as illustrated in the figure below. Data block DB123 is used as instance data block:

Fig 4-7 Configuration “one-year time switch”

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Basic data/parameterizability:

RAM requirements: year: 1110 bytes Instance DB: 56 bytes The parameter “Time_To_Check“ is a structure of the “year_udt“ (UDT4)

type. It contains:

• Start month

• Start day

• Start hour, start minute, start second summarized as “starttime” with

structure of the “times” (UDT6) type

• End month

• End day

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• End hour, end minute, end second summarized as “endtime” with structure of the “times” (UDT6) type

4.3.6 Relative time switch

The module for relative time switching has the following input parameters:

• EnableClock of “BOOL“ type Value = 1: Clock enabled Value = 0: Clock not enabled

• Reset of “BOOL“ type Value = 1: Each positive edge is evaluated at the parameter “StartTime“

-> the time is restarted every time Value = 0: The first positive edge at the parameter “StartTime” is evaluated. If the time has elapsed, the clock can be restarted by another edge change at the input “StartTime”.

• The parameter “Time_To_Go“ is a structure of the “relative_udt“ (UDT5) type. It contains:

- Number of days

- Number of hours

- Number of minutes

- Number of seconds

• Reset of “BOOL“ type Value = 1: Clock is reset Value = 0: Clock runs in “Normal operation”

The module for relative time switching has the following in/out parameters:

• StartTime of “BOOL“ type At a positive edge change at this parameter, the clock is active and stays active until the time at the parameter “time_to_go“ has elapsed.

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The control parameters for the relative time switch are EnableClock, CheckEdge, Reset and StartTime.

The control parameters and the output relate to each other as illustrated in the following pulse diagrams:

CheckEdge = 0:

EnableCloc CheckEdg StartTim e Reset

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Time active Output

Fig. 4-8 Pulse diagram CheckEdge = 0

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CheckEdge = 1:

EnableCloc CheckEdg StartTim Reset Time active Output

Fig. 4-9 Pulse diagram CheckEdge = 1

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The block for the relative time switch “relative ” FB124 is parameterized as illustrated in the figure below. Data block DB124 is used as instance data block:

Fig. 4-10 Configuration “relative time switch”

Basic data

RAM requirements: relative: 602 bytes Instance DB: 58 bytes

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4.3.7 Additional functions

In addition to the blocks for the absolute time switch and the relative time switch, blocks for summer/winter time changeover as well as for holiday recognition are also supplied.

Summer/wintertime changeover

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Standard: Program controlled (FB 103 “summer_winter”)

The block for the summer/winter time changeover adds exactly 1 hour to the current system time in the S7-CPU, when changing from winter to summer time, and subtracts exactly 1 hour when changing from summer to winter time. Changeover from winter to summer time occurs at the last Saturday in March, from summer to winter time at the last Saturday in October.

The block has the following input parameter:

• active of “BOOL“ type If the parameter = 1, the block is executed. If the parameter = 0, executing the block is prevented.

The block has the following output parameters:

• summertime of “BOOL“ type Value = 1: It is summer time Value = 0: It is winter time

• Error of “INT“ type Not equal 0, if during processing an error has occurred.

The block for the summer/winter time changeover “summer_winter” FB103 is parameterized as illustrated in the figure below. Data block DB103 is used as instance data block:

Fig 4-11 Configuration “summer/winter time changeover”

Basic data

RAM requirements: summer_winter: 382 bytes Instance DB: 48 bytes

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Option: Radio-clock controlled (FB 77 “DCF77_FB”)

Optionally the possibility is offered to use a radio-controlled clock for summer/winter time changeover instead of the block described above. In case the radio-controlled option has been selected in the ProTool view, the block FB103 „summer_winter“ is deactivated, instead of that the block FB77 „DCF77_FB“ is being called, which evaluates the signals received by the radio clock.

The block has the following input parameters:

• SekTakt of „BOOL“ type

Input „second clock pulse“ from DCF77 module

• Data of „BOOL“ type

Input bit pattern, data from DCF77 module

• SekCPU of „BOOL“ type

CPU clock memory bit with frequency 1 Hz

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• DCF77 of „TIMER“ type

Timing element for minute recognition

The block has the following output parameters:

• Zeitzone of „BOOL“ type Value = 1: It is summer time Value = 0: It is winter time

• Umsch_Zeitzone of „BOOL“ type Value = 1: changeover from summer to winter time or the other way round will occur in one hour

• Min_Puls of „BOOL“ type with the negative edge a new minute begins and/or the clock is being set

• Fehler of „BOOL“ type Value = 1: for three minutes or longer no valid telegram has been received

The block for the connection of the radio-controlled clock FB77 „DCF77_FB“ is parameterized as illustrated in the figure below. Data block DB77 is used as instance data block:

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Fig. 4-12 Configuration „DCF77_FB“

Basic data:

RAM requirements: DCF77_FB: 2960 bytes

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Instance DB: 58 bytes

Holiday recognition

The block checks a DB with 30 memory slots for holidays or special days, and sets the output to “1”, if the current day of the system time of the S7CPU coincides with a data in this DB.

The block has the following input parameter:

• DB_Nr of “INT“ tpye: contains the number of the DB in which holidays and special days are stored

Fig. 4-13 Layout of the DB to be checked

The block has the following output parameters:

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• holiday of “BOOL“ type Value = 1: current day is a holiday or special day Value = 0: current day is no holiday or special day

The block for recognizing holidays and special days “holidays” FC100 is parameterized as illustrated below:

Fig. 4-14 Configuration “recognizing holidays and special days“

4.4 HMI System

The HMI system used in this example is an OP3 or alternatively a TP170A.

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Note

Only two of the user interfaces are described here as an example. A detailed description is available in Chapter 6.

4.4.1 Operation at the OP3

The SIMATIC HMI device OP3 is a text-based display of the lower performance range. 7 views of time switching functions are available on the OP3:

• One-day time switch

• Seven-day time switch

• One-month time switch

• One-year time switch

• Relative time switch

• Summer/wintertime changeover

• Holidays

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Table 4-1 OP3 views

Clock/function Illustration

One-month time switch

Relative time switch

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Each view consists of several lines, two of which are always visible at the OP3. Input boxes are available for entering the absolute switch-on and switch-off times. Next to these input boxes, the clock status, possible errors during block processing, and current S7-CPU system time are given in output boxes.

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4.4.2 Operation at the TP170A

The TP170A is a low-end device. It is based on the standard operating system WindowsCE.

The TP170A has 9 views:

Table 4-2 TP170A views

Clock/function Illustration

Overview

One-day time switch

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Seven-day time switch

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Clock/function Illustration

One-month time switch

One-year time switch

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Relative time switch

Summer/wintertime changeover (in the figure the setting „Program-controlled changeover“ is active)

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Clock/function Illustration

5 holiday views (only one view is given here as an example)

Each view is a graphical user interface which provides input and output boxes. Input boxes are available for entering the absolute switch-on and switch-off times. Next to these input boxes, the clock status, possible errors during block processing, and current S7-CPU system time are given in output boxes.

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Part B: Installation of the Sample Application

Objectives of Part B:

Part B of this document provides the reader with information on the following topics.

• How to install the sample application with all the hardware and software components

• How to manipulate the application

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5 Installation of Hardware and Software

5.1 Hardware configuration

S7 Hardware configuration

For the hardware components required, please refer to chapter 2.3.1. “HW components“.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Fig. 5-1 Hardware configuration

Set up the components as directed in the manuals for the modules and connect the panel to the S7-CPU via an MPI cable.

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Optional: hardware configuration with radio clock

The SIPLUS DCF77 radio clock module is connected to the voltage supply unit / the SM 321 by means of a shielded 4-wire cable as follows:

PS SM 321 SIPLUS DCF77

E 0.0 Sec E 0.1 DCF Data L+ 24Vdc M Ground

You may, of course, connect the radio clock also via other digital inputs than those described here. In this case you only have to adjust the parameter settings for "SekTakt" and "Data" in OB1 correspondingly when calling FB77 "DCF77_FB".

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Functions of the LEDs on the radio clock module type SIPLUS DCF77:

Important!

green LED '24Vdc': voltage supply is active inner red LED 'DCF data': data transfer to the automation system outer red LED 'sec': pulses received from the atomic clock at 1-second

intervals

The SIPLUS DCF77 should be positioned so that the radio clock signal is not shielded by building facades of metal or similar obstacles. The module itself must be protected against interference frequency and should not be placed dire ctly on a metal surface.

Test proper signal reception at the place of installation by connecting the SIPLUS DCF77 module to supply voltage. Proper reception of the radio signals is indicated by the outer red LED which should be flashing at 1-second intervals. If the LED does not react or if it flashes inconsistently, another installation location should be found. Depending on the conditions of signal reception, clock setting normally takes about 3 to 4 minutes; if an unfavorable location has been selected, it will take some more time.

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5.2 Software installation

Requirements: STEP7 V5.1 has already been installed with the NCM package for Industrial Ethernet. In addition to STEP 7, ProTool V6 has already been installed on your computer.

5.2.1 Loading the application software into the S7-CPU

The simplest way of loading the application software into the S7-CPU is via the MPI. Connect the MPI interface of your PC with the MPI interface of the S7-CPU. To complete the transfer you must perform the following steps:

Table 5-1 Loading the application software into the S7-CPU

Step Action Screenshot

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1.

Open dialog box "Set PG/PC Interface" with commands "Start

>Settings-> Control PanelPG/PC-Schnittstelle einstellen [Set PG/PC Interface]".

2.

Choose S7ONLINE as the “Access Point of the Application“.

If this choice is not available to you, create it by clicking

<Hinzufügen/Löschen [Add/Remove]> (included in

options box under Access to Application.

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Step Action Screenshot

3.

In the options box "Zugangspunkt der Applikation" [Interface Parameter Assignment Used] select “CP5611(MPI)“. Click “Eigenschaften” [Properties...].

4.

Enter the MPI address for the PC, in this example the address “4“. Enter the other bus parameters and close the dialog with “OK“.

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5.

Quit the dialog “PG/PC-

Schnittstelle einstellen“ [Set PG/PC Interface] by

pressing “OK“.

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Step Action Screenshot

6.

Open the delivered project in the SIMATIC Manager and select the SIMATIC station. Load the project into the S7-CPU via the menu “Zielsystem > Laden“ [PLC >

Download] or with the

button.

5.2.2 Load the application software into the panel

The ProTool project must be loaded into the respective HMI device. There are 2 options:

• MPI transfer

• Serial transfer

In this example the MPI transfer is described. Connect the MPI interface of your PC with the MPI interface of the panel, here the TP170A.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Note

The same procedure is also necessary when using an OP3. In this case you must open the OP3 project (see step 3) instead of the TP170A project.

Table 5-2 Loading the application software into the panel

Step Action Screenshot

1.

2.

3.

For setting the PG/PC interface perform steps 1 to 5 of chapter 5.2.1

Open the delivered project in the SIMATIC Manager.

Select the project name, double click on “TP170A“. The project is opened in ProTool.

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Step Action Screenshot

4.

Make the necessary settings for the transfer operation. Open the menu “Datei > Transfer >

Einstellung...“ [File > Transfer > Settings...].

5.

Select “MPI/PROFIBUS DP“ and enter the OP address, “1“ in this example.

Note: The OP address must be identical with the network parameterization in ProTool. The settings are made under “Controls”.

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6.

Start the project transfer via the menu “File -> Transfer -> Start project transfer“.

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Step Action Screenshot

7.

Answer the query whether you want to save the configuration with “Ja“ [Yes].

8.

Subsequently generation is started, and if successful, the project transfer is started.

9.

Project transfer completed successfully if no error message occurred. Otherwise please check your settings and try again.

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6 Using the Application

For operating the application, respectively one example of a TO170A and a OP3 are delivered in this application. How to use the application is explained for two cases.

On application case uses many different absolute time switches plus summer/winter time changeover, and is displayed at the HMI interface of the TP170A (Chapter 6.1).

The second case includes several relative time switches as a pulse chain and only two absolute time switches. This application case is explained using the example of the OP3 (Chapter 6.2).

Note

How to use several time switches is described in Chapter 9.

Both application cases are included in the download on top of the “base project”, and can be used as a basis for your own configuration.

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6.1 Application case 1: Many time switches

In this case, several time switches of the absolute time switches are used (one-day, seven-day, one-month, one-year time switch):

• 2 one-day time switches

• 3 seven-day time switches

• 2 one-month time switches

• 1 one-year time switch

• 3 holidays

The clocks shall be active at the following times and be configurable as specified in the table:

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Table 6-1 Switching times of the clocks for application case 1

Clock (Time switch) Switching time Clock enabled Output reset

One-day time switch 1

7:00 to 8:30 a.m Yes No

(D1) One-day time switch 2

6:00 to 8:00 p.m No No

(D2) Seven-day time

switch 1 (W1) Seven-day week time

switch 2 (W2)

every Monday from 6:00 to 8:00

from Friday, 4:00 p.m to Monday

Yes Yes

Yes No

6:00 a.m.

Seven-day time switch 3 (W3)

from Monday to Friday from 12:00

Yes No

to 4:00 p.m.

One-month time switch 1 (M1)

every 10th of the month from 6:00

No Yes

a.m. to 10:00 p.m.

One-month time switch 2 (M2)

on last day of month from 2:00 to

Yes No

8:00 p.m.

One-year time switch (Y)

Holidays (H)

from 1st of May, 6:00 to 1

st

of June

6:00 a.m.

6.1.02, 1.5.02,

Yes No

- -

24.12.02.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

A separate view with the necessary variable switches must be available for every used time switch. The views for the different time switches are called from an overview display.

In this case the summer/winter time changeover is controlled by the radio clock module. You can change this default setting via the push of the corresponding button in the ProTool view. Thus the changeover will be performed program controlled with the FB 103 „summer_winter“.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

The HMI views for operating the application are divided in two parts:

• The upper parts contains the input boxes (in white) as well as the buttons necessary for operation. If a limit value violation occurs at the input boxes, the input boxes will be grayed.

• The lower part contains the output boxes which display the clock status as well as the current system time from the CPU.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Input

boxes

Output

boxes

Buttons for

operation

Fig. 6-1 Overview “operating the application“

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N

Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Operating the one-day time switch

The following parameters must be set for the one-day time switches:

• Switch-on times with hour, minute and second

• Switch-off times with hour, minute and second

• Control parameters

The parameterization for the one-day time switch is displayed for one-day time switch 1 listed above. The same parameterization applies for one-day time switch 2.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Start and

End times

Clock not

aktive

o error

Fig 6-2 Configuration one-day time switch 1

Go back to

overvie w

Clock enabled

Out pu t n o r re se t

Tod a y is n o t a ho liday Curren t date/time

in the S7 -C PU

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Operating the seven-day time switch

For the seven-day time switch the following parameters must be set:

• Switch-on time with hour, minute and second as well as the respective day of the week

• Switch-off time with hour, minute and second as well as the respective day of the week

• Control parameters

Specifying the day (day of the week):

• 1 to 7 corresponds to Sunday to Saturday

• 8 corresponds to Monday to Friday, i.e. the clock is active every day

from Monday to Friday between switch-on and switch-off time. If the switch-off time is less than the switch-on time, the clock is active until Saturday.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

• 9 corresponds to Saturday to Sunday, i.e. the clock is active every day from Saturday to Sunday between switch-on and switch-off time. If the switch-off time is less than the switch-on time, the clock is active until

!

Monday.

Important

The specified switch-on day is always “leading”. This means: If 8 or 9 has been specified as the start day, the end day must also be 8 or 9. If the start day is between 1 and 7, the end day must only be between 1 and 7 as well, and not be 8 or 9.

The parameterization for the seven-day time switch is displayed for sevenday time switch 1 listed above. The parameterization for the one-week time switches 2 and 3 follows the same parameterization as this one.

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N

y

N

Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Start and end-times

incl. day or the week

Clock not active

o error

Fig 6-3 Configuration seven-day time switch 1

Go back to

overview

Clock enabled

Output not reset

Today is no t a ho lid a Current da te /time

in the S7-CPU

Operating the one-month time switch

The following parameters must be set at the one-month time switch:

• Switch-on time with hour, minute and second, and day in the month

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

• Control parameters

The parameterization for the one-month time switch is displayed for onemonth time switch 1 listed above:

Start and end-time

with day

Clock is not active

o error

Go back to

overview

Clock enabled

Output reset

Today is a ho lid ay

Current da te /ti me

in the S7-CPU

Fig 6-4 Configuration one-month time switch 1

The parameterization of one-month time switch 2 follows the same parameterization as one-month time switch 1.

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y

Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Operating the one-year time switch

The following parameters must be set at the one-year time switch:

• Switch-on time with hour, minute, second, day and month

• Switch-off time with hour, minute, second, day and month

• Control parameters

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Start and end-time

with day and month

Clock active

o error

Go back to

overview

Clock enabled

Output not re se t

Today is no t a ho lid a

Current da te /ti me

in the S7-CPU

Fig 6-5 Configuration one-year time switch

Operating holidays/special days

Two views are available for entering the holidays/special days. 15 holidays/special days can be entered on each view. Entering a holiday/special day requires specifying day, month and year.

Input of

day, month, year

for each holiday

Display holiday yes/no

Current date/time

Fig. 6-6 User interface holiday / special day

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Operating summer/winter time changeover

This user interface offers the possibility to define via a button whether the changeover is to be performed program controlled, i.e. by FB 103 „summer_winter“, or if the radio-controlled option is to be activated as you use a radio receiver. In this application case the radio-controlled option has been activated.

If you do not want to use a radio-controlled clock, switch to the mode „Program controlled“.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Fig. 6-7 User interface summer/winter time changeover

Note

The same clocks can also be operated and monitored with the OP3 (LowCostrange) or with an other HMI device. The TP170A is only given here as an example.

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Below, an example is illustrated of how the outputs of the individual time switches are connected in the application case 1. This is for controlling valves for example.

D1

D2

OR

W2

M1

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

H

W1

D2

OR

M1

On a holiday, the clocks are reset to W 1 an d Y

Y

W3

AND

M2

Fig. 6-8 Example

The following points can be taken from the example:

• The outputs of a clock can be linked several times in the program

• Various outputs of clocks can be linked with an object, for example a

valve.

• Individual clocks can be “switched off” by means of the holiday block.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

6.2 Application case 2: Pulse chain

In this application case a one-day time switch, a seven-day time switch, as well as 3 relative time switches are used, whereby the 3 relative time switches make up a pulse chain. This means: Clock 1 switches off -> Off signal starts clock 2 -> clock 2 switches off -> Off signal starts clock 3. This is illustrated in the figure below.

Clock

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Fig. 6-9 Pulse diagram “pulse chain”

A view at the OP3 consists of several “windows” A “view” corresponds to 2 lines with 20 possible lines each. The upper line always displays the explanation on the parameter which can be entered into the bottom line.

„W indow“ at OP 3

Text description of the parameter

Inp u t/Ou tp u t-

field

Fig. 6-10 Overview OP3 view

The clocks in this application case shall be activated with the following parameters.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Table 6-2 Switching times of the clocks for application case 1

Clock (Time switch) Switching time Clock enabled Output reset

One-day time switch 1 (D)

Seven-day time switch 1 (W)

8:00 to 12:00 a.m.

Fridays from 12:00 to 8:00

Yes Yes

Yes No

p.m.

Relative time switch 1

2 hours Yes No

(R1) Relative time switch 2

(R2) Relative time switch 3

5 hours, 30

No No

minutes 1 day, 12 hours Yes Yes

(R3)

Note

In this case unfortunately no “live” views (views with set parameters) can be illustrated but only those from the configuration view.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Operating the one-day time switch

The following parameters must be set for the one-day time switches:

• Switch-on times with hour, minute and second

• Switch-off times with hour, minute and second

• Control parameters

Below you see a HMI interface for the one-day time switch in the configuration view at the OP3:

Enter

start time (8 :0 0 )

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Enter

end time (12:00)

Enable clock (1)

Clock aktive (0)

Reset

output (1)

0 -> no error

Current d a te /tim e

in the S7-CP U

Holiday/special day

Fig. 6-11 HMI interface for the one-day time switch (configuration view)

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Operating the seven-day time switch

For the seven-day time switch the following parameters must be set:

• Switch-on time with hour, minute and second as well as the respective day of the week

• Switch-off time with hour, minute and second as well as the respective day of the week

• Control parameters

Specifying the day (day of the week):

• 1 to 7 corresponds to Sunday to Saturday

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

• 8 corresponds to Monday to Friday, i.e. the clock is active every day from Monday to Friday between switch-on and switch-off time. If the switch-off time is less than the switch-on time, the clock is active until Saturday.

• 9 corresponds to Saturday to Sunday, i.e. the clock is active every day from Saturday to Sunday between switch-on and switch-off time. If the switch-off time is less than the switch-on time, the clock is active until Monday.

Important

!

The specified switch-on day is always “leading”. This means: If 8 or 9 has been specified as the start day, the end day must also be 8 or 9. If the start day is between 1 and 7, the end day must only be between 1 and 7 as well, and not be 8 or 9.

Below you see a HMI interface for the one-week time switch in the configuration view at the OP3:

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Enter star t-ti m e

with day of the week

6:00 12:00

Enter en d -ti m e

with day of the week

6:00 20:00

Enable clock (1)

Reset

output (0 )

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Clock active

0 -> no error

Current time

in the S7 -CPU

Holiday/special day

Fig. 6-12 HMI interface for the seven-day time switch (configuration view)

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N

Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Operating the relative time switch

The following parameters must be set for the relative time switch:

• Time_To_Check with days, hours, minutes and seconds

• Control parameters

Below you see a HMI interface for the relative time switch in the configuration view at the OP3:

Enter time

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Enable clock

Consider each or only first

edge at input "StartTime"

"1“, if clock aktive

Start-time

Reset if necessary

ot "0“, if error

during processing

Current date/time

in the S7-CPU

Fig. 6-13 HMI interface for the relative time switch (configuration view)

Note

The same clocks can also be operated and monitored with TP170A or with an other HMI device. The OP3 is only given here as an example.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Below, an example is illustrated of how the outputs of the individual time switches are connected in the application case 2. For example: Valves are controlled.

R1

R2

R3

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

D

OR

W

R1

R2

R3

D

OR

W

Fig. 6-14 Example

The following points can be taken from the example:

• The outputs of a clock can be linked several times in the program.

• Various outputs of clocks can be linked with an object, for example a

valve.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Part C: Program Description

Objectives of Part C:

The purpose of this section is to Explain the code details of some core elements in the program Suggest where it might usefully be expanded

Requirements

This is not an introduction to the STEP 7 STL language. Readers should be familiar with the basics of these languages.

Before reading the description of the code, it may be useful to read the chapters in parts A1 and A2.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

7 STEP 7 Program

The STEP 7 code will not be explained here line by line. This documentation will focus on the core points. Detailed information on the programs may be found in the appropriate sources.

7.1 Absolute time switches

7.1.1 Seven-day time switch

For the seven-day time switch (FB121) it must be checked whether the function Monday to Friday or Saturday to Sunday has been entered at the start day. If yes, the same function must be entered at the end day and the time must be checked specifically.

Table 7-1 Code seven-day time switch

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Code Remarks

NETWORK 3: // function: mo - fr?

L #time_to_check.startday L 8 ==I SPB s8 // function: sa - su? L #time_to_check.startday L 9 ==I SPB s9 L 8 L #time_to_check.endday ==I SPB err L 9 ==I SPB err SPA ess

Function equal Monday to Friday

Function equal Saturday to Sunday

If function at end day equals Mo – Fr oder Sa – Su then error and end

7.1.2 One-month time switch

At the month time switch (FB123) it must be checked whether the function “last day in the month” is used. If yes, the start day of the end day must be set to the last day of the respective month.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Table 7-2 Code one-month time switch

Code Remarks

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

NETZWERK 4: enst: NOP 0

L #time_to_check.start_dateday T #temp_startday L #time_to_check.end_dateday T #temp_endday L #temp_startday L 32 ==I SPB mola L #temp_endday L 32 ==I SPB mola SPA equa

NETWORK 5: mola: NOP 0

L #month SPL nomo SPA ende SPA m31 SPA m28 SPA m31 SPA m30 SPA m31 SPA m30 SPA m31 SPA m31 SPA m30 SPA m31 SPA m30 SPA m31

nomo: SPA ende NETWORK 6: m31: NOP 0

L #temp_startday L 32 <>I SPB m2 L 31 T #temp_startday m2: NOP 0 L #temp_endday L 32 <>I SPB equa L 31 T #temp_endday SPA equa

Check whether the Function” “Last day of the month” has been specified in the start day of in the end day.

If yes, check current month

If e.g. month with 31 days, set start day or end day to 31 (depending on where the “Function” “Last day in the month” is required)

Same function also exists for months with 30 days or with 28 days

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

7.2 Relative time switch

For the relative time switch (FB124) the correct evaluation of the individual inputs is important. Depending on whether the clock will be active, whether the time to elapse restarts at every edge or only at the first edge.

Table 7-3 Code relative time switch

Code Remarks

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

NETWORK 1: L 0

T #err UN #start SPB next

UN #checkflank SPB n2 SPA flan n2: NOP 0 U #Q SPB next flan: NOP 0 U #enable FP #startenable = #impuls UN #impuls SPB next

Clock not enabled-> check whether still active and needs to be switched off

Only the first edge is reacted to If output still active -> reset

output, otherwise check whether new positive edge

at the input “Enable“

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

7.3 Special functions

The special functions “Summer/winter time changeover” and “Holidays” are briefly discussed below.

7.3.1 Summer/wintertime changeover

For the summer/winter time changeover this application offers a programcontrolled changeover. Optionally, this time changeover can be performed by a radio-controlled clock module (compare user interface for summer/winter time changeover, fig. 6-7).

Standard: Program-controlled time changeover The time changeover takes place at the last Sunday in March or

respectively at the last Sunday in October. It is checked by the block by reading the current date/time from the S7.CPU (FB103).

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Table 7-4 Configuration summer/winter time changeover (program-controlled)

Code Remarks

NETWORK 3: L #actdate.actdayofweek // if current day of the week

sunday, L 1 <>I R #SetEdge BEB // nothing -> end L #actdate.actmonth // current month == March, L 3 ==I SPB mrz // goto check, if it is the last sunday L #actdate.actmonth // current month == October L 10 ==I SPB okt // goto check, if it is the last sunday BEA

. . .

Check whether today is Sunday

Check whether it is the last Sunday in March

Check whether it is the last Sunday in October

Option: Radio-controlled time changeover

In this case the block FB77 „DCF77_FB“ is being called instead of FB103 „summer_winter“. FB77 evaluates the signals sent by the radio-controlled clock. The block is know-how protected, therefore only the call of the block and the parameterization are shown below.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Table 7-5 Configuration summer/winter time changeover (radio-controlled)

Code Remarks

NETWORK 9:

CALL "DCF77_FB" , "DCF77_IDB" SekTakt :=SecClockDCF Data :=DataDCF SekCPU :=1HzPulse DCF77 :="DCF77_Timer" Zeitzone :="TimeZone" Umsch_Zeitzone:="SwitchTimeZoneIn1Hour"

Min_Puls :="Min_Pulse"

Fehler :="ErrorDCF77"

Input „second clock pulse“ of DCF module Input “data” of DCF module Clock memory byte in the CPU Timing element for DCF77 evaluation 1=summertime 0=wintertime 1= in 1h switch from summer to wintertime

or from winter to summertime with this pulse a new minute begins and the

clock is being set 1= for longer than 3 minutes no valid

telegram has been received

7.3.2 Holidays/special days

The block FC 100 checks in a loop whether a date in the DB with the holidays and special days is identical with the current date.

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Table 7-5 Code holidays/special days

Code Remarks

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

NETZWERK 2: . .

schl: T #zaehler L #jahr L DBW [#index] <>I SPB jnex L #index SRW 3 L 2 +I SLW 3 T #index L #monat L DBW [#index] <>I SPB mnex L #index SRW 3 L 2 +I SLW 3 T #index L #tag L DBW [#index] <>I SPB tnex SET S #feiertag BEA

Check whether year in the DB coincides with the current year

Increase index

Check whether month in the DB coincides with the current month

Increase index

Check whether day in the DB coincides with the current day

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

8 HMI Interface

There are no scripts in the HMI configuration. The views are explained in detail in Chapter 6. Therefore this chapter is kept very short.

9 Changes in the STEP 7 Programs

The steps to be performed to adapt the application to your requirements are listed below. These include:

• What to do if a second time switch of the same type is needed? (Chapter

9.1)

• How can I get several switch-on/off times into one block? (Chapter 9.2)

• What to do if more holidays or special days are needed? (Chapter 9.3)

• How can I save on Instance DBs? (Chapter 9.4)

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

9.1 What to do if a second time switch of the same type is needed?

The respective FB must be called a second time with new parameters.

Table 9-1 Second time switch of the same type

Step Instruction Note / Instruction

Open the block from which the time

1

function is to be called, e.g. OB1. Call the time function twice and supply

2

the interface with your parameters. Note:

The parameters are assigned to data areas, which have the structure of the

required UDT. 3 Save 4

Choose PLC -> Download

Or download symbol

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

9.2 How can I get several switch-on/off times into one time switch block?

Table 9-2 Several switch-on/off times in one block

Step Instruction Note / Instruction

Create a new FB in the block container of

1

the SIMATIC Manager and open it. Create as many input parameters of the

2

respective UDT as switch-on/off times are required (e.g. 3).

Note: On calling, link the input parameters of the new FB with the data areas which have the structure of the required UDT.

Call the FB for the respective time

3

function (depending on which UDT you used) as often as a respective input parameter has been configured in the instruction section of the new FB.

4 Save the newly created FB.

Now call this FB in your user program

5

e.g. OB1. 7 Save 8

Choose PLC -> Download

Or download symbol

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Rev. B - final 19.07.2002 78/84

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

9.3 What to do if more holidays or special days are needed?

Table 9-3 More holidays/special days

Step Instruction Note / Instruction

Open the DB in which the holidays and

1

special days are stored (DB100 in this

example)

Increase the number of Array elements to

2

the desired number (default value 30)

3 Save the DB.

Open the FC which checks the holidays

4

(FC100 in this example).

Increase the loop count. The loop count

5

must be as high as the number of array

elements

Note:

The code sequence is available in the

network 2 of the block. 7 Save the FC. 8

Load the block via PLC -> Download im

SIMATIC Manager.

Or download symbol

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

9.4 How can I save on Instance DBs?

Table 9-4 Saving on Instance-DBs

Step Instruction Note / Instruction

Create a new FB in the block container of

1

the SIMATIC Manager and open it.

Create static variables (instances). The

2

type of the static variable corresponds to

the time function for the one-day time

switch e.g. FB120.

Call the instances in the block as often as

3

the time functions are required. 4 Save the newly created FB.

Now call this FB in your user program

5

e.g. OB1. 7 Save 8

Choose PLC -> Download

Or download symbol

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Further information on so-called multi-instances are also available in the STEP 7 online-help.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Appendix: Connection of the SICLOCK radio clock

Introduction

Within the scope of the present application, the SIPLUS radio clock was used. A viable alternative is the use of the SICLOCK radio clock. This appendix describes the SICLOCK features in a concise from. These features are grouped as follows:

• Functionality

• Basic performance data

• Hardware components

• Hardware connection

• Software interface and block parameterization

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

These points are addressed below.

Functionality

The SICLOCK radio clock features the same principal functionality as SIPLUS. It is used for reception of the DCF77 time signal transmitter, the signal of which is demodulated and provided as an impulse for the S7. The software supplied synchronizes the S7-CPU system time with the official time received.

Basic performance data

The basic performance data of the SICLOCK DCF77 radio receiver are as follows:

Frequency 77.5kHz Band width 400 Hz Dimensions Sensitivity

(W x H x D) 185 x 80 x 65 mm

0.3 µV

Connection cable 20 m, firmly attached Connector type 9 pole SUBD Power supply via RS232 interface Operating temperature -10 °C to +50 °C Protection type IP65

:

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Hardware components

The following hardware components are required for connection to S7-300:

Component Order number Description/View

SICLOCK DCFRS 2XV9450-1AR06 DCF77 receiver

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

9 pole DSUB connector

2XV9450-1AR35 For connection to SIMATIC

with 5m connection cable Optocoupler 3TX7-005-3PB54

The following figure shows a complete schematic hardware configuration with SICLOCK radio clock:

Radio clock

Optocoupler

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Hardware connection

Wiring the SICLOCK radio clock module to the power supply / SM 321 is made as follows:

PS SM 321 SICLOCK

E 0.3 Yellow (received signal) M Grey (cable screen) L+ Green (supply voltage) M Brown (signal and supply ground)

For amplifying the SICLOCK transmitter signal, using an optocoupler may be required. In this case wiring is made according to the scheme below:

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

SIMATIC S7

Optocoupler SICLOCK

PS SM

+13 24Vdc Green (supply voltage)

Mass

A2 0V Brown (signal and supply ground)

Grey (cable screen) E 0.3 14 A1 Yellow (received signal)

Important note

The radio clock module should be positioned so that the radio signal is not shielded by building facades of metal or similar obstacles. The module itself must be shielded from interference frequencies and should not be positioned directly on a metal surface.

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Time switch based on the S7-300/400 CPUs with simple HMI system including radio-controlled clock connection

Software interface and block parameterization

Along with the hardware, a disk is supplied that contains all S7 blocks necessary for the SICLOCK DCF77 reception service. These are: FB100, DB100, SFC0, SFC39, SFC40, FC34 These blocks have to be included in the blocks folder of your S7 project.

The call of the FB100 function block has to be made in the following blocks:

• OB 1

• OB 100 (Startup OB)

• OB 35 (timed alarm 10 ms):

Parameterization follows the table below:

BID21669756_Zeitschaltuhr_einfach_DOKU_v20_e.doc

Call

OB1 OB100 OB35

in

Additional information:

Additional information on the SICLOCK DCF receiver is available for download from http://www.siclock.de/, and in the operating and installation instructions supplied with the hardware.

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Siemens SIMATIC S7 400, SIMATIC S7 300 Application Description

Specifications and Main Features

Frequently Asked Questions

User Manual

Part A1 : Application Description

2 Automation Solution

2.1 Functionality in the S7-CPU

2.1.1 Absolute time switching functions One-day time switch:

2.1.2 Relative time function Relative time switch:

2.1.3 Additional functions

2.2 Controlling and monitoring

2.3 Standard components required

2.3.1 Hardware components

2.3.2 Software components

2.4 Application software components required and their "product features"

2.5 Installation with simple setup

3 Basic performance data

Part A2 : Function Mechanisms

4 Examples of Function Mechanisms

4.1 Introduction

4.2 Overview of the Structure Elements

4.3 STEP7 application level

4.3.1 Absolute time switching functions

4.3.2 One-day time switch

4.3.3 Seven-day time switch

4.3.4 One-month time switch

4.3.5 One-year time switch

4.3.6 Relative time switch

4.3.7 Additional functions

4.4 HMI System

4.4.1 Operation at the OP3

4.4.2 Operation at the TP170A

Part B: Installation of the Sample Application

5 Installation of Hardware and Software

5.1 Hardware configuration

5.2 Software installation

5.2.1 Loading the application software into the S7-CPU

5.2.2 Load the application software into the panel

6 Using the Application

6.1 Application case 1: Many time switches

6.2 Application case 2: Pulse chain

Part C: Program Description

7 STEP 7 Program

7.1 Absolute time switches

7.1.1 Seven-day time switch

7.1.2 One-month time switch

7.2 Relative time switch

7.3 Special functions

7.3.1 Summer/wintertime changeover

7.3.2 Holidays/special days

8 HMI Interface

9 Changes in the STEP 7 Programs

9.1 What to do if a second time switch of the same type is needed?

9.2 How can I get several switch-on/off times into one time switch block?

9.3 What to do if more holidays or special days are needed?

9.4 How can I save on Instance DBs?

Appendix: Connection of the SICLOCK radio clock