Siemens SIMATIC S7 Technical Document

Ultrasonic Position Encoding Module

SM 338

SIMATIC S7

Release 06/96Equipment Manual

Contents

Product Overview 1

The SM 338 Module 2

Mounting 3

Data Communication with the

PLC 4

Operation 5

Appendix A

Release 06/96

SM 338

Ultrasonic Position Encoding

Module

Equipment Manual

762 21 087

SIMATIC S7

SM 338 Equipment Manual

(

)

SIMATICRis a registered trademark of SIEMENS AG.

This manual contains notices which you should observe to ensure your own personal safety, as

well as to protect the product and connected equipment. These notices are highlighted in the

manual by a warning triangle and are marked as follows according to the level of danger:

!Danger

indicates that death, severe personal injury or substantial property damage will result if proper

precautions are not taken.

!Warning

indicates that death, severe personal injury or substantial property damage can result if proper

precautions are not taken.

!Caution

indicates that minor personal injury or property damage can result if proper precautions are not taken.

Note

draws your attention to particularly important information on the product, handling the product, or

to a particular part of the documentation.

The device/system may only be set up and operated in conjunction with this manual.

Note the following:

!Warning

This device and its components may only be used for the applications described in thecatalog or the

technical description, and only in connection with devices or componentsfrom other manufacturers

which have been approved or recommended by Siemens.

This product can only function correctly and safely if it is transported, stored, set up, and installed

correctly, and operated and maintained as recommended.

We have checked the contents of this manual for agreement with the hardware and

software described. Since deviations cannot be precluded entirely, we cannot guarantee

full agreement. However, the data in this manual are reviewed regularly and any neces-

sary corrections included in subsequent editions. Suggestions for improvement are

welcomed.

The reproduction, transmission or use of this document or its contents is not permitted

without express written authority. Offenders will be liable for damages. All rights,

including rights created by patent grant or registration of a utility model or design, are

reserved.

Siemens AG

Automation Group

Systems Engineering

P. O. Box 2355

D-90713 Fuerth

Germany

Siemens Aktiengesellschaft Order No. 762 21 087

Technical data subject to change.

ESiemens AG 1995

Safety Guidelines

Qualified Personnel

Correct Usage

SM 338 Equipment Manual

(4) J31069-D401-U1-A0-7618

Table of Contents

1 Product Overview 1-1......................................................

2 The SM 338 Module 2-1.....................................................

2.1 Layout 2-2.........................................................

2.2 Measuring Principle 2-4..............................................

2.3 US Measuring System 2-5...........................................

3 Mounting 3-1..............................................................

3.1 Installation 3-2.....................................................

3.2 Installation 3-6.....................................................

4 Data Communication with the PLC 4-1.......................................

4.1 Input Area 4-2......................................................

4.2 Parameter Area 4-3.................................................

4.3 Diagnosos Area 4-9.................................................

4.3.1 System Diagnosis Bytes 4-10.........................................

4.3.2 Channel--Related Diagnosis Bytes 4-12.................................

5 Operation 5-1..............................................................

5.1 Parameter Assignment 5-2...........................................

5.2 Example of an SDB 100 5-4..........................................

5.3 Normal Operation 5-7...............................................

5.4 Error Diagnostics 5-8................................................

6 Appendix A-1..............................................................

A.1 Technische Daten A-2...............................................

A.2 Plug Connector Allocation A-4........................................

A.3 Recommended Accessories A-6......................................

ii SM 338 Equipment Manual

(4) J31069-D401-U1-A0-7618

Figures

2-1 Front view of the module 2-2.........................................

2-2 Principle of ultrasonic position encoding 2-4............................

2-3 Possible assignment of the measuring points 2-6........................

4-1 Organization of the dual port RAM 4-1.................................

4-2 Example of the measuring points of a sensor 4-5........................

5-1 Flowchart of channel--related diagnostics 5-9...........................

Tables

2-1 LED indicators 2-3..................................................

2-2 Recommended sensors 2-5..........................................

3-1 Slot for the SM 338 3-2..............................................

3-2 Slot numbers for S7 modules 3-4.....................................

3-3 Terminal assignment 3-5.............................................

4-1 Input area 4-2......................................................

4-2 Bytes for counter assignment 4-5.....................................

4-3 Bytes for setting of the counters 4-6...................................

4-4 Default values for the parameter area 4-8..............................

Content

iii

SM 338 Equipment Manual

(4) J31069-D401-U1-A0-7618

Notes on the CE Seal

The following applies to the product described in this manual.

Products bearing the CE seal meet the requirements of EU Directive

89/336/EEC ’Electromagnetic Compatibility’ and the harmonized

European standards (EN) listed therein.

In accordance with article 10 of the above--mentioned EU Directive, the EU

declarations of conformity are held available for inspection by responsible

authorities at the addresses listed below:

Siemens Aktiengesellschaft

Bereich Automatisierungstechnik

AUT7 WKF KB2

Postfach 2355

D-90713 Fürth

The products have been designed for use in the industrial area and meet the

following requirements:

Area of Application Requirements

Emitted interference Immunity

Industry EN 50081-2 : 1993 EN 50082-2 : 1995

The products meet the requirements if you:

1. Observe the installation guidelines and safety notes contained in the ap-

plicable manuals and supplementary documentation, both for the pro-

grammable system and the individual module.

2. Observe the rules below.

The programmable systems and the listed modules must be installed in

grounded, closed metal enclosures (e.g., switching cabinets).

All signal lines outside this enclosure must be shielded as described in the

equipment manuals. The shields of the signal lines must be applied to the

shield bar at the entrance to the cabinet.

EU EMC directive

89/336/EEC

Area of application

Observing the

installation guide-

lines

Installing the

devices

iv SM 338 Equipment Manual

(4) J31069-D401-U1-A0-7618

In order to protect the modules from static electrical discharge, operating

personnel must discharge themselves of static electricity before opening

switching cabinets or switchboxes.

In contrast to the specifications contained in the ”General Technical Specifi-

cations” of the manual, the specifications listed below on electromagnetic

compatibility apply to modules which carry the CE seal.

The specifications apply to devices installed in accordance with the stated

installation guidelines.

Electromagnetic Compatibility Specifications Test Values

Immunity to static electrical discharge1

Tested in accordance with EN 61000-4-2

Dischargetoair8kV

Discharge on contact

4kV

Immunity to electromagnetic fields1

STested in accordance with EN V 50140

(amplitude-modulated HF)

STested in accordance wit EN V 50204

((pulse--modulated HF)

80 to 1000 MHz

10 V/m

80% AM (1 kHz)

900 MHz

10 V/m

50% ED, 200 Hz

repetition frequency

Immunity to fast transient bursts

Tested in accordance with EN 61000-4-4

SSupply lines for AC 120/230 V

SSignal lines (I/O and bus lines)

2kV

2kV2

Immunity to high frequency

Tested in accordance with EN V 50141

0.15 to 80 MHz

10 V

80% AM (1 kHz)

Source impedance 150 Ω

Emitted interference1

Tested in accordance wit EN 55011

SEmission of electromagnetic fields

SEmitted interference over supply cable

Limit value class A,

group 1

Limit value class A,

group 1

1 For closed metal housing

2 Signal lines that are not used for process control: 1 kV (e.g., connections to external

printers)

Working on

switching cabinets

Updated technical

specifications

1-1

SM 338 Equipment Manual

(4) J31069-D401-U1-A0-7618

Product Overview

The SM 338 is a position encoding module for the S7-300 programmable

controller. The module is connected to the P bus of the programmable con-

troller, and its parameters are assigned by the CPU. The SM 338 belongs to

the family of signal modules.

Position encoding is performed by ultrasonic sensors. These sensors offer the

following primary advantages.

SNo wear and tear

SHigh protection class

SSteady accuracy regardless of the sensor length

SLow costs for longer sensors (> 500 mm)

SUp to four measuring points (magnets) per sensor possible

SThe digital sensor interface (RS 422) is not sensitive to interference and

permits lines up to 50 m in length.

The SM 338 does not condition the data. Its only function is to supply the

CPU with counting values. Eight counters are available for the acquisition of

measured values.

Up to four sensors can be connected on the SM 338 module, and each sensor

can contain up to four measuring points. The sum of the measuring points on

all connected sensors may not exceed 8.

The sensors connected to the module can operate in synchronous or asyn-

chronous mode. This requires that the parameters of the selected sensors be

assigned appropriately.

Synchronous mode

The selected sensors operate synchronously (i.e., at the end of the cycle time,

the counting values of all synchronous sensors are transferred to the input

area of the dual port RAM). If enabled, an end-of-cycle alarm to the CPU is

then triggered. Synchronous mode does not use a parameterized, sensor-re-

lated, measuring cycle time.

Position encoding

with ultrasonic

sensors

Operating modes

1-2 SM 338 Equipment Manual

(4) J31069-D401-U1-A0-7618

Asynchronous mode

The selected sensors operate asynchronously (i.e., each sensor operates with

its own specific sensor measuring cycle time). The measuring cycle time is

the time available to the sensor for one measurement. This time can be set

separately for each sensor. Cycle time and measuring cycle time are not de-

pendent on each other. At the end of the measuring cycle time, the counting

values allocated to this sensor are transferred to the input area of the dual

port RAM.

The SM 338 module is equipped with the following functions.

SEach sensor can be parameterized separately.

SCycle time and measuring cycle time can be parameterized separately

(and with different lengths).

SGlobal enabling of an end-of-cycle alarm (i.e., process alarm) can be

parameterized.

SGlobal enabling of diagnosis alarms can be parameterized.

SSensor-related enabling of the diagnoses can be parameterized.

SSensor-related enabling of wire break monitoring can be parameterized.

SFirmware monitoring via watchdog

SIndication of error states via two LEDs

SModule parameters can be reassigned during normal running operation.

The main application area of the SM 338 is with plastics processing ma-

chines. Particularly with injection molding and blow molding machines, ul-

trasonic sensors are being used increasingly for position encoding. The

SM 338 is the direct link from the sensor to the S7-300 programmable con-

troller.

Functionality

Use

oduct Ove

view

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