mae10-e.pdf

Controlled Positioning of an Axis with Stepper Motor

Using the Example of a "Cutting-to-Length" Process

incl. HMI Configuration (S7-200, EM253, FM-STEPDRIVE,

SIMOSTEP type 1FL3, TD200)

Micro Application Example 10

V1.0 (Edition 03/2003)

Structure of the document

Part A1

Automation Description (incl. Component list/Basic performance data)

Part A2 :

Function Mechanisms in Detail

Part B:

Step by Step Commissioning and Setup

Part C:

Program Description

Micro Application Examples

The Fast Track to an

Optimized Solution

Liability

Siemens AG does not accept liability of any kind for damages arising from

the use of this application, except where it is obliged to by law, in cases

such as damage to items used for personal purposes, personal injury,

willful damage or gross negligence.

Warranty

The program examples given are specific solutions to complex tasks which

were worked on by Customer Support. We must also point out that it is not

possible in the current state of the technology to exclude all errors in

software programs under all conditions of use. The program examples were

prepared according to the best of our knowledge. However, we cannot

accept any liability beyond the standard guarantee for Class C software in

accordance with our General Terms of Sale for Software Products for

Automation and Drive Technology". The program examples can be

purchased on the Internet as single licenses. They may not be transferred

to a third party.

Controlled Positioning of an Axis with Stepper Motor Using the Example of a "Cutting-to-Length" Process

incl. HMI Configuration

Table of Contents

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

The Automation Task................................................................................. 8

The Automation Solution ........................................................................ 10

2.1

Required standard hardware and software components and

components of the application software ("shopping list") ........................... 12

2.1.1

Hardware components ............................................................................... 12

2.1.2

Software components ................................................................................ 12

2.2

Application software components .............................................................. 13

Basic performance data .......................................................................... 14

3.1

General ...................................................................................................... 14

3.2

Example for using the calculation matrix shown in chapter 3.3 ................. 15

3.3

Calculation matrix....................................................................................... 16

3.3.1

Acceleration time [ms]................................................................................ 16

3.3.2

Delay .......................................................................................................... 16

3.4

Selected, measured times for verifying the calculated values ................... 18

Part A2 : Function Mechanisms ................................................................................ 20

Function Mechanisms ............................................................................. 21

4.1

Description of entire solution structure....................................................... 21

4.1.1

Control unit (S7-CPU 222 and positioning module EM 253) ...................... 22

4.1.2

Control of the FM STEPDRIVE and the SIMOSTEP stepper motor .......... 24

4.1.3

Operator control and monitoring of the application with the TD200

text display unit .......................................................................................... 33

4.2

Program and data structure ....................................................................... 34

4.2.1

Organization block " STEP1_MAIN " ......................................................... 35

4.2.2

Subroutine " STEP1_MOTION " ................................................................ 36

4.2.3

Subroutine "STEP1_MSELECT" ................................................................ 38

4.2.4

Subroutine "STEP1_PSELECT" ................................................................ 39

4.2.5

Subroutine "STEP1_FCUT" ....................................................................... 40

4.2.6

Subroutine "STEP1_STATUS"................................................................... 41

4.2.7

Variables used in the program ................................................................... 41

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

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

5.1

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

5.1.1

Installation of the S7-200 CPU and the EM253 positioning module .......... 48

5.1.2

Installation of the FM STEPDRIVE ............................................................ 48

5.1.3

Electrical connection of the components.................................................... 49

5.2.1

Software installation ................................................................................... 56

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5.2

Transfer of the application code to the S7-200 CPU.................................. 56

Controlled Positioning of an Axis with Stepper Motor Using the Example of a "Cutting-to-Length" Process

incl. HMI Configuration

5.2.2

Parameter setting for the FM STEPDRIVE ................................................ 57

Operator Control via Text Display TD200 .............................................. 58

6.1

Automatic/jog mode ................................................................................... 58

6.2

Selecting and setting profiles ..................................................................... 60

6.3

Display of status information ...................................................................... 61

6.4

Setting the first cut ..................................................................................... 62

Part C: Program Description ..................................................................................... 63

Explanation of the main parts of the S7-Micro/Win program............... 64

7.1

Details on the sub-program STEP1_MOTION ........................................... 65

7.2

Details on the sub-program STEP1_PSELECT ......................................... 71

Modifying the S7-Micro/Win Program .................................................... 77

8.1

Changing the parameters for motion.......................................................... 77

8.2

Increasing the number of profiles............................................................... 79

8.3

Changing the feedrate................................................................................ 80

8.4

Use of other motor versions ....................................................................... 81

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Controlled Positioning of an Axis with Stepper Motor Using the Example of a "Cutting-to-Length" Process

incl. HMI Configuration

Preamble

The application described in this document is used for the »controlled

positioning of an axis with a stepper motor using the example of a

cutting-to-length process, including HMI configuration« and it belongs

to the group of controlled positioning procedures.

Basically, these procedures can be broken down into "controlled" and

"closed-loop controlled" positioning processes. In contrast to controlled

positioning systems, control units used for closed-loop controlled

positioning must be continuously provided with in-process information on

the current position.

The application for controlled positioning described here requires the

following component types:

• S7-222 CPU

• EM 253 POSITION

• FM STEPDRIVE

• SIMOSTEP 2Nm (stepper motor)

• TD200 text display unit.

The SIMOSTEP stepper motor mentioned above is also available in other

versions with different ratings; the application described here refers to a

type of stepper motor which is quite common on the market.

In combination with exactly the components as stated above, the

application described in this document offers a Plug&Play solution for

linear axes and also includes primary performance data verified under

load.

But you may also select other products from the specified product types

(e.g. SIMOSTEP 4Nm instead of 2Nm) that meet best your specific

purpose: our detailed description of the function mechanisms and of the

user program will help you to choose functional features that suit your

individual requirements (e.g. with regard to the HW components used).

Furthermore, we give answers to frequently asked questions which will help

you to reach your goal step by step (see chapter 8 "Modifying the S7

Micro/Win Program"), e.g. on "how to proceed, if you wish to use another

type of stepper motor with different ratings".

Rev. A - Endgültig 04.04.2003

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