NetLink 700-883-PRO42 User Manual

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Systeme Helmholz GmbH z Hannberger Weg 2 z 91091 Großenseebach z Germany

Phone: +49 9135 7380-0 z Fax: +49 9135 7380-110 z E-Mail: info@helmholz.de z Internet: www.helmholz.de

Ethernet Gateway for MPI/PPI/PROFIBUS

700-883-PRO42

User Manual

Edition 2 / 29.03.2010

HW 1-1, FW 2.30 and higher

Order number of manual: 900-883-PRO42/en

All rights are reserved, including those of translation, reprinting, and reproduction of this manual, or parts thereof. No part of this manual may be reproduced, processed, copied, or transmitted in any way whatsoever (photocopy, microfilm, or other method) without the express written permission of Systeme Helmholz GmbH, not even for use as training material, or using electronic systems. All rights reserved in the case of a patent grant or registration of a utility model or design.

Systeme Helmholz GmbH

Hannberger Weg 2, 91091 Grossenseebach, Germany

Note:

We have checked the content of this manual for conformity with the hardware and software described. Nevertheless, because deviations cannot be ruled out, we cannot accept any liability for complete conformity. The information in this manual is regularly updated. When using purchased products, please heed the latest version of the manual, which can be viewed in the Internet at www.helmholz.de, from where it can also be downloaded.

Our customers are important to us. We are always glad to receive suggestions for improvement and ideas.

STEP ,Protool, Starter, Micromaster, and SIMATIC are registered trademarks of SIEMENS AG MS-DOS and Windows are registered trademarks of Microsoft Corporation.

Revision history of this document:

Edition Date Revision

1 18.08.2009 First Edition

2 29.03.2010

Change cross-cable in the scope of supply, new Web Interface features added

NETLink

Switch 5

Contents

1 Safety Information 8

1.1 General 8

1.2 Restriction of access 9

1.3 Information for the user 9

1.4 Use as intended 9

1.5 Avoiding use not as intended! 9

2 Installation and Mounting 10

2.1 Mounting orientation 10

2.2 Minimum clearance 10

2.3 Installing the module 10

3 System Overview 11

3.1 Application and function description 11

3.2 Connections 12

3.3 LED displays and Connectors 12

3.4 Items supplied 13

3.5 Accessories 13

3.5.1 Manuals 13

3.5.2 Software 13

3.5.3 Other accessories 13

3.5.4 PROFIBUS accessories 14

4 Installation of the driver software 15

4.1 Introduction 15

4.2 System requirements 15

4.3 Running the installation setup 15

4.3.1 Adding the interface to the PG/PC interface 16

4.3.2 Selecting the required interface parameterization 17

5 Configuration via the NETLink-S7-NET Driver 18

5.1 Bus settings 18

5.1.1 MPI 19

5.1.2 PROFIBUS configuration 20

5.1.3 PPI configuration 23

5.2 Local connection (TCP parameterization) 23

NETLink

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5.2.1

Creating a station 24

5.2.2 Setting TCP parameters 26

5.2.3 Operation without the DHCP 27

5.2.4 DHCP 28

5.2.5 Additional features 28

5.3 Options of the driver 29

5.3.1 Language setting of the display elements 29

5.3.2 Version information 29

5.4 Diagnostics 30

5.4.1 Bus members 30

5.4.2 Bus parameters 30

5.5 Teleservice 31

6 The Tool: ‘NETLink® PRO Family Configuration’ 32

7 Possibilities of the Web Interface 33

7.1 Home page 33

7.2 Status page 34

7.3 Configuration page 38

7.4 Security page 41

7.5 Observing variables 43

8 RFC1006 Function (S7-TCP/IP) 46

9 Bus Parameters in Single Master Operation 47

9.1 Storing specified bus parameters 47

9.2 Addressing (rack/slot mode ON/OFF) 48

9.2.1 Addressed mode 49

9.2.2 Rack/slot mode 49

9.3 Example of configuration for WinCC V7.0 50

9.3.1 Using addressed mode 50

9.3.2 Use of rack/slot mode 53

10 Troubleshooting 57

11 Appendix 62

11.1 Technical Data 62

11.2 Pin assignments 62

11.2.1 MPI/PROFIBUS interface pin assignments 62

11.2.2 Assignment of the Ethernet interface (host interface) 62

11.2.3 Function overview of internal switch 63

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11.2.4

Power supply socket 63

11.3 Further Documentation 63

11.4 Information in the internet 63

11.5 Address conversion table 64

12 Glossary 65

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1 Safety Information

For your own safety and for the safety of others, always heed the safety information given here. The safety information indicates possible hazards and provides information about how you can avoid hazardous situations.

The following symbols are used in this manual.

Caution, indicates hazards and sources of error

Gives information

Hazard, general or specific

Danger of electric shock

1.1 General

NETLink® Switch is only used as part of a complete system.

The operator of a machine system is responsible for observing all safety and accident prevention regulations applicable to the application in question.

During configuration, safety and accident prevention rules spe-

cific to the application must be observed.

Emergency OFF facilities according to EN 60204 / IEC 204 must remain active in all modes of the machine system. The system must not enter an undefined restart.

Faults occurring in the machine system that can cause damage to property or injury to persons must be prevented by additional external equipment. Such equipment must also ensure entry into a safe state in the event of a fault. Such equipment includes electromechanical safety buttons, mechanical interlocks, etc. (see EN 954-1, risk estimation).

Never execute or initiate safety-related functions using an operator terminal.

NETLink

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1.2 Restriction of access

The modules are open equipment and must only be installed in electrical equipment rooms, cabinets, or housings. Access to the electrical equipment rooms, barriers, or housings must only be possible using a tool or key and only permitted to personnel having received instruction or authorization.

1.3 Information for the user

This manual is addressed to anyone wishing to configure, use, or install NETLink

Switch.

The manual tells the user how to operate NETLink

Switch and explains the signaling functions. It provides the installing technician with all the necessary data.

NETLink

Switch is exclusively for use with a S7-200 and S7-

300/S7-400 programmable controller from Siemens.

NETLink

Switch is for use within a complete system only. For that reason, the configuring engineer, user, and installing technician must observe the standards, safety and accident prevention rules applicable in the particular application. The operator of the automation system is responsible for observing these rules.

1.4 Use as intended

NETLink® Switch must only be used as a communication and signaling system as described in the manual.

1.5 Avoiding use not as intended!

Safety-related functions must not be controlled via NETLink® Switch alone. Make sure in the software that uncontrolled restarts cannot occur.

Only authorized persons must have access to the modules!

uring configuration, safety and accident prevention rules specific to the application must be observed.

ake sure in the software that uncontrolled restarts cannot occur.

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2 Installation and Mounting

Installation and mounting must be effected in compliance with VDE 0100 / IEC 364. Because it is an IP20 module, you must install it in a cabinet.

A maximum ambient temperature of 60 ºC must be ensured for reliable operation.

2.1 Mounting orientation

NETLink® Switch can be installed in any position.

2.2 Minimum clearance

Minimum clearances must be observed because

• Then it is possible to insert and remove NETLink

Switch with-

out having to remove other system components.

• There is enough space to connect existing interfaces and other

contacts using standard commercial type accessories.

For NETLink

Switch, a minimum clearance of 30 mm should be

left above and below and 10 mm at the sides.

2.3 Installing the module

NETLink® Switch is intended to be mounted on a DIN rail bracket. It can be snapped into place by simply attaching it to the DIN rail bracket. In order to do so, you hook NETLink

Switch into the rail bracket at the upper groove of the DIN rail bracket and push NETLink

Switch in direction of the rail bracket. Thereupon, NETLink® Switch should snap into place automatically. In order to remove the hardware module from the rail bracket, it is necessary to push NETLink

Switch up first and then remove it from the upper

groove.

efore you start installation work, all system components must be disconnected from their

ower source.

NETLink

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3 System Overview

3.1 Application and function description

NETLink® Switch is a gateway between a TCP network and a MPI, PPI, or PROFIBUS network.

Two protocols are available at the TCP end for exchange of useful data with the automation system (multi-protocol operation):

• One is a proprietary protocol that is used to connect to the pro-

prietary NETLink-S7-NET driver

• The other is the S7-TCP/IP protocol often used by visualization

system manufacturers which is known as ‘RFC1006’ or ‘ISO on top of TCP’.

Up to 16 TCP connections (10 Mbps or 100 Mbps) and up to 32 MPI/PPI/PROFIBUS connections (9.6 kbps to 12 Mbps) can be used simultaneously.

The integrated 4-way switch makes it possible to connect further Ethernet nodes to NETLink

Switch. If NETLink® Switch has to be restarted via the driver or the web interface (e.g., due to new configurations), the Switch stays ready for use without a new initialization of the 4 ports.

On both the TCP and the field bus sides, the baud rate used can be determined automatically (auto negotiation or autobaud).

NETLink

Switch needs to get 24 VDC power via the power sup-

plies at the lower left side of the case.

The connecting cable used to link NETLink

Switch with the pro-

grammable controller is to be connected to the front of NETLink

Switch. In case of a branch line it is to be executed actively (accessories, see chapter 3.5). When a node is integrated in the bus, the connection can be carried out via a common PROFIBUS plug (accessories, see chapter 3.5).

The use of the NETLink-S7-NET driver makes it possible to use NETLink

Switch as the following at the PC end

• Programming adapter,

• Teleservice unit, or

• Operator control and monitoring unit and

• Ethernet switch

The RFC1006 interface also enables you to use third-party software that supports this protocol to communicate with S7-200/S7-300 and S7-400 systems.

NETLink

Switch can generally be connected to the PC via switch,

hub or directly via LAN cable in both cases.

NETLink

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3.2 Connections

NETLink® Switch has the following connections:

• RJ45 socket for connecting the unit to a commercial type

switch or hub using a standard CAT5 TCP or Crossover-Cable. Additional Ethernet nodes can be connected as well.

• Power supply socket for 24 V DC power supply.

Here, an additional connector for the function ground is provided. It is recommended to connect a function ground.

• Bus connector via interface at the front side.

NETLink

Switch needs to be connected to the bus via a common PROFIBUS plug. It can be connected at the beginning, middle or end segment of the respective bus. The terminating resistor must be connected (ON) if NETLink

Switch is at the beginning or end of a bus segment. If this is not the case, the switch position must be OFF. If NETLink

Switch is to be operated with a branch line, the latter has to be executed as ‘active line’ in order to avoid bus faults.

3.3 LED displays and Connectors

NETLink® Switch has three LEDs, including two two-color LEDs, to indicate its operating status.

The two LEDs located on the four RJ45 sockets indicate by their status, the state of the LAN that is connected to the respective port.

LINK LED (green) ACTIVE LED (yellow)

Status Description Status Description

OFF

Not connected

OFF

No activity on the network

Connected

Activity on the network

BLINK

Activity on the network

The three LEDs (two two-color LEDs) on the top of NETLink® Switch indicate the operating status of the device itself:

LED status for operating status

Power

LED

(green)

Active

LED

(green

)

Active

LED

(red)

Connect

LED

(green)

Connect

LED

(red)

Ready for operation

Try to log on to the MPI/PPI/PROFIBUS

BLINK

Actively logged on to the MPI/PPI/PROFIBUS

Active connection with a programmable controller

ON ON

Data exchange with a programmable controller

ON BLINK

Transferring firmware update

BLINK

BLINK BLINK

The NETLink has the IP address 192.168.4.49 on deliver

y f

rom the factory.

NETLink

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Storing firmware update

ON ON

Exception at bus end

BLINK

Exception at PC end

BLINK

3.4 Items supplied

The scope of supply of NETLink® Switch includes:

• NETLink

Switch ready to run

• CAT5 TCP cable (cross-over) with a length of 3 meters

• CD with NETLink-S7-NET driver, additional info’s

• Manual (German/English)

3.5 Accessories

3.5.1 Manuals

Manual, German 900-883-PRO42/de

Manual, English 900-883-PRO42/en

3.5.2 Software

S7/S5 OPC server

with USB dongle 800-880-OPC20

3.5.3 Other accessories

Power su

pply adapter with plug 700-751-SNT01

Input: 100-240 V AC / 47-63 Hz / 400 mA

Output: 24 V DC / 625 mA

Active PROFIBUS plug cable 3m 700-901-4BD00

The NETLink has the

P address

192.168.4.49 on delivery from the factory.

NETLink

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3.5.4 PROFIBUS accessories

EasyC

onnect

PROFIBUS plug without PG 700-972-0BA50

EasyConnect

PROFIBUS plug with PG 700-972-0BB50

EasyConnect

PROFIBUS plug for flexible lines, without PG

700-972-0FA50

EasyConnect

PROFIBUS plug for flexible ines, with PG

700-972-0FB50

EasyConnect

PROFIBUS plug axial axialer outlet

for inflexible lines 700-972-0CA50

EasyConnect

PROFIBUS plug axial axialer outlet

for flexible lines 700-972-0CF50

EasyConnect

PROFIBUS plug with diagnostics

without PG for inflexible cables 700-972-7BA50

EasyConnect

PROFIBUS plug with diagnostics

and PG for inflexible cables 700-972-7BB50

EasyConnect

PROFIBUS plug with diagnostics

without PG for flexible cables 700-972-7FA50

EasyConnect

PROFIBUS plug with diagnostics

and PG for flexible cables 700-972-7FB50

Bus connection plug for PROFIBUS 90° without PG 700-972-0BA12 Bus connection plug for PROFIBUS 90° with PG 700-972-0BB12

Bus connection plug for PROFIBUS 35° without PG 700-972-0BA41 Bus connection plug for PROFIBUS 35° with PG 700-972-0BB41

Bus connection plug for PROFIBUS axial 700-972-0CA12

Bus connection plug for PROFIBUS with Atex license, without PG, Ex-Zone 2 700-973-0BA12 Bus connection plug for PROFIBUS with Atex license, with PG, Ex-Zone 2 700-973-0BB12

PROFIBUS plug diagnostics without PG 700-972-7BA12 PROFIBUS plug diagnostics with PG 700-972-7BB12

PROFIBUS FLEXtra profiPoint 700-972-1AA02 PROFIBUS FLEXtra twinRepeater 700-972-2AA02

PROFIBUS Compact Repeater 700-972-0RB12

Dismantling tool for PROFIBUS 700-972-6AA00

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4 Installation of the driver software

With installation of the NETLink-S7-NET driver for NETLink® Switch, it is easy to access controllers with a MPI/PPI/PROFIBUS interface from the PC via TCP/IP.

4.1 Introduction

The NETLink-S7-NET driver is inserted in the PG/PC interface of an existing Simatic application and can then be used from most Simatic engineering tools (STEP7, ProTool, WinCC, etc.).

Access is possible to any controllers of the Simatic S7-200, S7-300, or S7-400 series via NETLink

Switch.

4.2 System requirements

A PC with a 32-bit Windows operating system is required to operate the NETLink-S7-NET driver at the PU end. The Windows XP (SP3) and Windows Vista operating systems can be used.

A further requirement is the existence of a Simatic engineering tools, such as STEP7, Version 5.1 and higher or STEP7-Micro/Win Version 4.0 and higher, which ensures that the PG/PC interface is installed on the computer.

Installation under Windows 2000 and 64-bit operating systems is possible but is not supported by the technical support team of Systeme Helmholz GmbH. Please pay attention to the requirements of the Simatic package used.

A functioning network link using TCP/IP must have been set up

on the PCs that are used. The network configuration of the PC

must be known. Commercially network cards and, for the connection, cross-over- or 1:1 (straight) cables may be used.

The integrated auto-negotiation function automatically negotiates the TCP/IP transmission speed between the stations. In this way, the best performance is achieved in a local 100 Mbps network. Status operation will be slowed down if older 10 Mbps network cards and hubs are used.

4.3 Running the installation setup

After you have inserted the installation CD, user guidance starts automatically, allowing the user to start the setup routine of the NETLink-S7-NET driver.

If the user guidance does not start automatically, the setup file can be launched manually in directory ‘CD drive:\Driver\’.

If necessary, you can download the latest NETLink-S7-NET driver

from our homepage (http://www.helmholz.de).

Please note

that for installation you have to log on as an adminis-

trator under the 32-bit Windows operating systems because the

setup program has to make entries in the Windows registry.

dministration rights are required for installation.

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4.3.1 Adding the interface to the PG/PC interface

After initial installation, the new interf

ace parameter set ‘NET- Link-S7-NET’ has to be set up. Administrator rights are necessary for this.

After you have started ‘Set PG/PC Interface’ in the Control Panel, click the ‘Select…’ button there.

This opens the ‘Install/uninstall interface’ dialog box.

After you have selected the entry ‘NETLink-S7-NET PRO family’ from the left-hand list, click the ‘Install-->’ button.

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The ‘NETLink-S7-NET PRO’ has now been included in the selection list so that it is available for selection in future.

The access path in the ‘Set PG/PC Interface’ dialog box is set when this window is closed.

4.3.2 Selecting the required interface parameterization

The selection list for the interface para

meter sets now contains an

additional three items for NETLink PRO Family.

All relevant settings of a NETLink-S7-NET driver can be made via the "Properties" access field. With the button ‘Diagnostics...’ it is possible to show the nodes connected to the bus and the parameters the bus is working with. These fields are explained in Section

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5 Configuration via the NETLink-S7-NET Driver

Once a NETLink® PRO Family has been selected in the ‘Set PG/PC Interface’ window, it is possible to specify this access path more

precisely with the ‘Properties…’ button.

With the functionality behind the button ‘Diagnostics...,’ which is visible when a NETLink

PRO Family is selected, it is possible to

read the bus configuration and scan connected nodes.

The properties of the access NETLink

PRO Family are divided

into three subareas:

• Bus settings

Here it is possible to state the bus configuration (e.g. station address) with which the NETLink

Switch will enter the bus

system (Section 5.1).

• Local connection (TCP configuration)

Here, you set the IP address via which the required connection with the programmable controller will be established (Section

5.2). The NETLink

Switch hardware can also be parameterized in

this window.

• Options

Here it is possible to change the language of the NETLink-S7NET driver and to read out the version information of the driver (Section 5.3).

Two functionalities are implemented for diagnostics at the connected bus:

• Bus members

a list of all active and passive nodes connected to the bus will be displayed. By request the order numbers (MLFBs) will be displayed also if this functionality is available by the nodes (Section 5.4.1).

• Bus parameters

If possible, a list of all available bus parameters will be displayed (Section 5.4.2).

5.1 Bus settings

The NETLink® Switch can be operated on three different bus systems: MPI, PPI, and PROFIBUS.

From the NETLink

Switch user’s viewpoint, the three bus systems only differentiates by the transmission rates that can be selected and the additional options which are explained here.

The bus configuration is passed to the NETLink

Switch during the runtime of the NETLink-S7-NET driver and is not stored in the device.

It is possible to use the NETLink

Switch without specifying bus-

related information. The NETLink

Switch then automatically as-

certains the baud rate and the bus parameters, and can be oper-

NETLink

Switch 19

ated on different programmable controllers with different transmission rates without switching over the NETLink-S7-NET driver.

5.1.1 MPI

The MPI co

nfiguration contains station and network-related set-

tings.

The most important setting concerning bus configuration is assignment of the station address. This refers to the address the NETLink

Switch will have on the bus when it goes online.

The station address can have any value from ‘0’ and ‘126’ if the selected address is lower than or equal to the highest station address (HSA).

Example: HSA = 31

Any value between ‘0’ and ‘31’ can be specified for the station address if this address does not yet exist on the bus.

The local timeout of the NETLink-S7-NET driver can be parameterized in the station-related settings. If the driver does not receive a response to a request within the set timeout, a communication error is signaled to the Simatic application.

The network settings can be adapted manually if the checkmark next to “Automatic Baud Rate Detection” is removed. This is usually only necessary if the NETLink

Switch fails to sign onto the bus

system automatically (can happen with passive bus participant).

NETLink

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Some older Siemens CPUs do not support the auto baud function on the MPI. PPI systems do not usually support this function either. In such cases, the network-related parameters should be adapted manually.

The transmission speed and the HSA of the PLC being addressed must be known and identical to all connected bus nodes.

It is also possible that the auto baud function may not function reliably at transmission rates slower than or equal to 19.2 Kbps or with increased use of communication via global data exchange, because the relevant frame is transmitted more irregularly by the CPUs. In such cases it may be advantageous to assign the bus parameters manually.

5.1.2 PROFIBUS configuration

Basically, the same applies to PROFIBUS configurati

on as to MPI configuration. However, the network-related parameters are more extensive.

In addition to the parameters transmission rate and highest station address mentioned in Section

5.1.1, PROFIBUS also has pa-

rameter field for selecting the bus profile and bus parameters.

If the NETLink

Switch is the only active station on the PROFIBUS, it operates in so-called single-master mode, i.e. it generates the token cycle with the set bus parameters.

If the bus speed on the PROFIBUS is set to a value less than 187.5 Kbps, please remember that it may take up to half a minute for the bus parameters to be recognized.

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In this case, the timeout value should be increased correspondingly.

Profile:

• Under PROFIBUS, there are usually the profiles DP, Standard

und User defined.

• The profile must be selected that is already used in the pro-

grammable controller.

Bus parameters:

• Unlike the MPI bus profile, the bus parameters for PROFIBUS

are not constant and change with the type and number of PROFIBUS stations used.

• Always set the PROFIBUS parameters that are set in the cur-

rently used programmable controller (see current STEP7 project).

In order to simplify these procedures, it makes sense to use of the auto baud function under PROFIBUS.

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The bus parameters are then calculated automatically.

Under PROFIBUS, please note that the auto baud function works best if the ‘Cyclic distribution of the bus parameters’ function is activated in the programmable controller used.

The screenshot above of a hardware configuration of a randomly chosen PROFIBUS CPU shows where to find the switch for cyclic distribution of the bus parameters.

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5.1.3 PPI configuration

Basically, the same applies to PPI configu

ration as to MPI configuration. However, the network-related parameters are more extensive.

In addition to the parameters transmission rate and highest station address mentioned in Section 5.1.1, PROFIBUS also has a parameter f

ield for selecting the bus profile and bus parameters:

According to current knowledge, all S7-200 CPUs of the product line 22x should be able to communicate with ‘Advanced PPI.’ It is recommended to use ‘Advanced PPI’ if possible.

5.2 Local connection (TCP parameterization)

There are three basic ways of parameterizing NETLink® Switch at the TCP end:

• Parameterization via ‘Set PG/PC interface

Existing stations can be reparameterized using the ‘Change’ button

• Parameterization via the ‘NETLink PRO Family configuration’

tool (see Section 6).

• Parameterization via the web interface of the

NETLink

Switch

(see Section

7.3).

If the NETLink

Switch is configured via the NETLink-S7-NET

driver, the following points must be considered:

If the NETLink

Switch is active on the bus when reparameterization is required (e.g. a variable table or block is being viewed), reparameterization is not performed.

Normally the baud rate cannot be detected automatically at PPI systems.

NETLink

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The ensuing reset would interrupt the NETLink

Switch link

• The NETLink

Switch can be protected against unauthorized reparameterization via a password (default password: “admin”). If an attempt is made to save a parameter set with an incorrect password, the following messages is displayed:

• If the password is correct during parameterization, the new pa-

rameter set will be saved and the following message displayed:

• NETLink

Switch is now restarted. This can take up to 15 sec-

onds.

5.2.1 Creating a station

The ‘New’ button takes

you to an input dialog box in which you

can store the known IP address of an existing NETLink

Switch

and any name for easier assignment.

To able to access a NETLink

Switch with the NETLink-S7-NET driver, a station must be set up first. This station is virtually and is not stored in the NETLink

Switch hardware – it permits easier

differentiation if several NETLink

Switch and/or other devices

from the NETLink

family are used.

Is the desired NETLink

Switch behind a router (e.g. internet tele-

service), the network administrator is able to configure the router

The password query must be answered correctly and confirmed with OK.

ebooting can take up to 15

seconds.

The NETLink has the IP address 192.168.4.49 on deliver

y f

rom the factory.

The default password is ‘admin.’

f NAT/PAT is used, a port can be defined if ‘Internet teleservice’ is selected.

NETLink

Switch 25

via NAT/PAT. So all frames going to a specific port of the router going to a specific NETLink

Switch behind the router.

Using this functionality makes it possible to communicate to more as one NETLink

Switch behind a router, if each station gets

a specific port configuration.

Is the NETLink

Switch connected to the local network, the

‘Internet teleservice’ option must be deselected.

‘OK’ stores this station, which can now be used.

It is easier to search for an existing NETLink

Switch in the local

area network. Just click the ‘Search NETLink PRO Family…’ button.

If you now select the required NETLink® Switch and click the ‘Close + Get’ button, the following dialog box will appear again:

This station can also be saved with ‘OK’ and is then available.

If you do not want the name that is stored in the NETLink

Switch to be the same as the station name, you can overwrite the station name (e.g. replacing the name ‘Helmholz_test’ with the name ‘Workshop’ in the example below).

NETLink

Switch 26

This completes parameterization of the driver.

It may now be necessary to adapt the NETLink

Switch to the

situation in the existing TCP/IP network.

5.2.2 Setting TCP parameters

To change the TCP parameters, sel

ect the station in question and

open the following dialog box with the ‘Edit’ button.

NETLink

Switch 27

The ‘Parameterize NETLink …’ button takes you to a new input form that already contains the current parameters of the NETLink

Switch:

If no NETLink

Switch can be accessed via the stated IP address,

the following message will appear:

This message can have two causes:

• There is no NETLink

Switch with the stated IP address (e.g. the

device has not yet been switched on or is still starting up).

• The IP configuration of the computer used does not match the

IP configuration of the stated NETLink

Switch (e.g. different

subnet mask settings).

From the parameterization form shown, it can be seen that not only static IP address allocation but also IP parameter assignment via DHCP is possible.

Both these options are now explained in more detail.

5.2.3 Operation without the DHCP

If NETLink

Switch is used in a network without a DHCP server

(or you want the NETLink

Switch to work with the same IP address on the network despite the presence of a DHCP server) the required IP parameters are stored in the input forms for ‘Static pa- rameters.’

In this case, the checkmark is not set in the field ‘Get IP address automatically (DHCP).’

Clicking the ‘Save in NETLink PRO Family’ button saves the parameters in the NETLink

Switch.

NETLink

Switch 28

5.2.4 DHCP

To have the

NETLink

Switch receive its IP parameters automatically via DHCP, set a checkmark in the field ‘Get IP address auto- matically (DHCP).’

This then enables the ‘DHCP Timeout (s)’ input field. Enter the maximum waiting time here. If the NETLink

Switch does not receive any parameters from the DHCP server within this time, it will use the stored static parameters to ensure that the device is accessible in the network and can be configured if necessary.

Times shorter than 30 seconds are replaced by the default value (30 seconds) because most DHCP servers require 12 to 20 seconds to assign valid parameter sets.

Clicking the ‘Save in NETLink

’ button saves the parameters in the

NETLink

Switch.

DHCP has the drawback that a NETLink

Switch parameterized by this method could theoretically be assigned a different IP address from the DHCP every time it is switched on.

The system administrator responsible for the DHCP server can counter this informing the DHCP server of the MAC address of the NETLink

Switch. However, this is additional work for the sys-

tem administrator.

5.2.5 Additional features

The ‘NETLink PRO Family propertie

s’ input form contains a ‘Net-

Link PRO Family properties’ group box with further options that are

explained here:

• Name:

Here a name can be given to the NETLink

Switch that identifies it better when it is shown in the search window. The name is stored in the device. The name may designate the location (e.g. conveyor HG1), the user (e.g. Mr. Example), or anything else.

• Web interface active:

If there is a checkmark in this checkbox, the parameterization of the NETLink

Switch can be viewed and changed, if necessary, in any standard Browser (e.g. IE, Firefox, Opera …) as long as the password (if one has been set) is known. Section 7 provides more detailed information about what

you

can do with the web interface.

• Changing the password:

Here you can change the actual password. It is only possible to change the configuration of the NETLink

Switch with the password.

NETLink

Switch 29

This applies to parameterization both via the driver and via the web interface.

Clicking the ‘Save in NETLink

’ button saves the parameters in the

NETLink

Switch in this case, too.

5.3 Options of the driver

Under the options of the NETLink-S7-NET driver, it is possible to set the language of the output and help texts of the driver.

It is also possible to read out the version numbers of the driver files used.

5.3.1 Language setting of the display elements

The langu

ages German and English are currently available.

After switching over the language, the setting window must be opened again to apply the changes.

5.3.2 Version information

The name

s and version number of all driver files are listed here.

If support is needed, this data is used to obtain information about the components used quickly and effectively.

The default password is ‘admin.’

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5.4 Diagnostics

For rudimentary diagnostics of the connected bus two sub functions are available:

• Display bus nodes

• Display bus parameters

Before the diagnostics functionality is used, a valid station must be created and a plausible bus configuration set.

5.4.1 Bus members

A list of all

available nodes at the bus will be generated by clicking

the button ‘Read.’

With activating the option ‘Read MLFB number’ the order numbers of all devices supporting this function will be displayed too.

The possibility to detect all connected nodes depends on the parameterization of the PG/PC Interface. It is recommended to enable auto baud functionality at MPI and PROFIBUS.

5.4.2 Bus parameters

If it

is possible a list of all bus parameters will be displayed by

clicking the button ‘Read.’

The possibility to detect the bus parameters depends on the parameterization of the PG/PC Interface.

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It is recommended to enable auto baud functionality at MPI and PROFIBUS.

5.5 Teleservice

If you want to use the NETLink® Switch for teleservice, you should consult the network administrators of both the locations involved.

There are various ways of implementing teleservice via a WAN. Here are some suggestions:

• Assignment of a separate, unique IP address with direct access

to the network (WAN). Advantage: Quick to implement No intervention by the administrator required Disadvantage: Few globally available addresses exist, A separate network with direct WAN access is required, Security

• Use behind a router by means of NAT/PAT

Advantage: Can be integrated into existing infrastructures. Administrator can ensure that it is not visible/usable from outside. Disadvantage: Network administrators must parameterize routers and firewalls between the communicating nodes.

• Use of a dial-up router (e.g. NETLink

Router) Advantage: relatively simple to implement if a phone connection is available. Disadvantage: Loss of performance, additional costs due to phone charges, IP address can only be queried remotely via DynDNS services.

NETLink

Switch 32

6 The Tool: ‘NETLink

PRO Family Configuration’

If no Simatic engineering tool is available on the parameterization computer that has installed the PG/PC interface, it is possible to configure the NETLink

Switch via the integrated web interface

(see Section 7.3) or via the separate configuration tool.

The tool is accessible under ‘Start/

Programs/Systeme Helm-

holz/NETLink-S7-NET/NETLink PRO Family Configuration’ after the

NETLink-S7-NET driver has been installed. After this program has been called, the network will be searched for connected NETLink

MAC addresses:

The scan can be repeated at any time by pressing the “Scan” button again. Having chosen any NETLink

adapter out of the pro-

vided list, it is possible to configure the device after clicking ‘Pa- rametrize…’ as described in Section 5.

An extended function enables direct parameterization across network boundaries. To do this, activate the radio button and enter the known IP address of the NETLink

(the example includes the optional address of the port – separated by a colon) in the empty field. The corresponding configuration menu then opens when "Parameterize..." is clicked.

The set IP address of the connected

NETLink

devices is not relevant for search function. The search function uses the device-specific

AC addresses. All other data in the list is for information only.

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Switch 33

7 Possibilities of the Web Interface

If it has not been deactivated by the user, the web interface of the NETLink

Switch can be opened with any standard browser (e.g.

Internet Explorer, Firefox, Opera, etc.)

The web interface is intended to support the user intuitively with information and configuration tasks.

7.1 Home page

The home page, which is located at ‘http://<ip-address>,’ is a basic address and navigation starting point for the user.

From this page you can go to the status page, to the Basic Configuration page, to the security page and, if the computer is connected to the Internet, to the web site of Systeme Helmholz GmbH.

The page also shows the contact data, such as postal address, phone and fax number, e-mail and web address.

The NETLink® PRO Compact has the IP address 192.168.4.49 on delivery from the factory.

NETLink

Switch 34

7.2 Status page

The status page, accessible via a link on the home page, provides the user with information without allowing unauthorized reconfiguration of the NETLink

Switch.

The page provides general information (e.g. firmware version, number of possible connections, etc.), and specific information (baud rate, active stations, DHCP status, etc.). A “Diagnostic Page” is also implemented, which can be useful for troubleshooting, for

NETLink

Switch 35

example. To make use of this function, “Go Online” must be activated for the NETLink

Switch on the bus system. This can be done with an engineering tool such as STEP7 or by using the “Go Online” button on the status page. This function can also be switched on permanently on the “Basic Configuration” page (see Section 7.3).

When the "Diagnostic Page" button is pressed, if the bus system is correctly connected, a list of the currently most important communications parameters will be shown. For a better overview, the table can be emptied with the "Clear List" function before a new list is requested.

Because the NETLink

Switch is also active as a single master, it is also possible to search for passive stations only. The search is started by clicking “Search Passive Stations.” The updated status of verified stations is then displayed.

The values shown here are volatile!

NETLink

Switch 36

The result is entered in line: List of passive stations.

NETLink

Switch 37

All displayed elements are shown below in the form of a table.

All the relevant contents appear in the displayed configuration, which means that the NETLink

Switch has signed onto the bus

system (is online).

Device-specific parameters:

Product name NETLink® Switch Product order number 700-884-MPI21 Firmware version e.g. V2.30 BIOS version e.g. V2.240 Serial number e.g. T00008797 MAC address e.g. 00:06:71:19:22:5D

Device name

This shows the freely selectable name of the NETLink® Switch, if a name has been assigned.

Bus-specific parameters:

Own station address

If the NETLink® Switch is active on the bus, this is the device’s own station address.

Online bus parameters

If the NETLink® Switch is active on the bus, this is the explanation of the bus parameter set, this is transmitted by a CPU.

List of active stations

If the NETLink® Switch is active on the bus, this is the list of the stations that are currently active. The device’s own address is shown in red.

List of passive stations

After a search request by a user, a list of passive stations is output here.

Currently used connections

If the NETLink® Switch has opened at least one bus connection, the exact count of open connections will be displayed.

TCP-specific parameters:

IP Address

The currently used IP address of the NETLink® Switch is

shown (e.g. 192.168.4.44).

Subnet Mask

The currently used subnet mask of the NETLink® Switch

is shown (e.g. 255.255.0.0).

Gateway Address

If it has been set by the user, the standard gateway

currently used will be displayed here (e.g.

192.168.1.1).

Listen on Port

Port or ports via which the NETLink® Switch can be

reached by the PG/PC interface.

DHCP

(- DHCP timeout)

Shows whether the DHCP is activated or not (ON or

OFF). In active mode, the DHCP timeout is also dis-

played here.

Connected to client address

IP address of the computer that has just established a

connection to the NETLink

Switch.

Security interface ON/OFF

Indicates whether the IP address access protection is

activated.

Currently used TCP connections

If the NETLink® Switch has opened at least one TCP or

RFC1006, the exact count of open TCP connections

will be displayed here (maximum value shown in

brackets).

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Bus-specific settings:

- Go online after boot up

Shows whether the function for automatic connection is activated or not (ON or OFF).

- Own station address

Indicates the local station address. This is the address with which the NETLink

Switch will participate in the

bus cycle.

- Rack/Slot mode ON/OFF

Indicates whether R/S mode (ON) or addressed mode (OFF) is used (for details, see Section 9.2).

- Currently used RFC connections

If the NETLink® Switch has opened at least one TCP or RFC1006, the exact count of open connections will be displayed here (maximum value shown in brackets).

7.3 Configuration page

The configuration page, accessible via a link on the home page, is a configuration interface for the user.

Before this page is opened, the user name (default: NETLink Switch, if no user-defined user name is entered) and the password (admin if no user-defined password has been set) must be entered.

The confirmation prompt is case sensitive. So you must remember which upper and lower case letters you used.

The default user name is “NETLink Switch”

The default password is ‘admin.’

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Switch 39

As soon as you have answered the security query, you will have write access to all parameters.

NETLink

Switch 40

The bus parameters can also be adapted to the single master functionalities. For further details on the RFC1006 function see Section 8.

Device-specific parameters:

Device name

Name consisting of max. 20 alphanumeric characters.

TCP parameters:

Static IP address

IP address that is used if DHCP is deactivated or the DHCP timeout elapses.

Static subnet mask

Subnet mask that is used if DHCP is deactivated or the DHCP timeout elapses.

Static gateway

Gateway that is used if DHCP is deactivated or the DHCP timeout elapses.

Alternative NETLink Port

In addition to the standard port, a further freely selectable port can be stored here in the NETLink

Switch.

DHCP ON/OFF

Automatic fetching of address parameters from a DHCP server ON or OFF.

DHCP Timeout (in seconds)

Possible range: 30 to 65535 seconds. Timeout is deactivated at 65535. In this case, there is no fallback mechanism, i.e. it is essential that a DHCP server is accessible!

Web-Interface ON/OFF Web interface is ON or OFF

Bus-specific parameters:

Go online after boot up ON/OFF

The need to go “online” immediately is largely only relevant when CPU-to-CPU communication is used.

NETLink MPI/PB Address

This is where the address with which the NETLink

Switch will participate in the bus cycle is entered. Any address assigned at another location (e.g. by the SHS7-Net driver) is then ignored.

Single Master bus parameters

The bus parameters specified here are used if the single master function is active.

Rack/Slot modus ON/OFF

Indicates whether R/S mode (ON) or addressed mode (OFF) is used (for details, see Section 9.2).

Fix destination address for R/S mode

If R/S mode is activated, all incoming RFC1006 requests are routed to the bus address parameterized here.

User/password settings:

User

User name needed to sign on to the security-relevant pages of the NETLink

Switch

New password Password of max. eight characters

Retype new password

The password of max. eight characters must be entered a second time

Please remember that the user names/passwords that you have defined for this configuration interface cannot be reset by any “master reset”. Please contact our technical support if you are no longer able to access the safety-relevant pages of the Web interface with the access data known to you.

or further information,

see Section 9

NETLink

Switch 41

If you click the ‘Submit’ button, the inputs are checked for plausibility. You may then be shown which inputs are incorrect and what correct input would look like at this point.

If all entries are consistent, the changes are displayed again as they will now be stored non-volatilely in the NETLink

Switch

when you click the ‘Store’ button again.

After the changed parameterization data have been stored, the NETLink

Switch is restarted to activate the desired configuration.

With the Web interface, NETLink

Switch can be started both locally and remotely, as required. This is done by clicking the ‘De- vice Reboot’ button.

7.4 Security page

The security page, which is also accessible via a link on the home page, is a configuration interface available to the user for limiting access.

After the security query (see 7.3) has been correctly answered, the user has write-access to all parameters that are implemented for TCP security etc.

If the TCP access list is switched on by entering ‘ON,’ stations, TCP connections can be established with the NETLink

Switch only from stations that have addresses configured in the table ‘TCP address 1’ to ‘TCP address 12’ (white list).

The IP addresses must be entered in the four-octet pattern (e.g. ‘192.168.4.36.’) To clear or reset the TCP address setting, ‘OFF’ must be entered.

TCP/IP addresses that are not in the white list have read-only access to the web interface. MPI, PPI, or PROFIBUS functionalities cannot be used. The configuration of the NETLink

Switch is also

prevented.

It is also possible to activate additional write protection for any bus nodes connected to the NETLink

Switch. If the NETLink® Switch is used, for example, as a communications adapter for representing visualization values, only data from the connected controllers can be read out if write protection is active. In this way, manipulation of the CPU sequential program is ruled out.

This assumes, of course, that the access data for the NETLink

Switch web interface are secure.

Attention: To prevent their use by unauthorized persons, any proxy servers that exist in company networks may not be entered in the white list. If so, safe use of the NETLink

Switch is not

guaranteed.

ebooting can take up to

15 seconds.

Notice deviation by usage of proxy servers.

NETLink

Switch 42

With the button ‘Factory defaults’ it is possible to restore all parameters to the as-delivered state of the NETLink

Switch. All user-

defined configurations will be deleted by this function.

If you click the ‘Submit’ button, the inputs are checked for plausibility. You may then be shown which inputs are incorrect and what correct input would look like at this point.

If all entries are consistent, the changes are displayed again as they will now be stored non-volatile in the NETLink

Switch

when you click the ‘Store’ button again.

NETLink

Switch 43

After the new parameterization data have been stored, the NETLink

Switch is restarted to activate the new configuration.

Parameters of the TCP access list:

TCP access list ON/OFF

Switch ON/OFF the functionality of the TCP access list.

TCP/IP address 1 and 2

First and second IP addresses that are allowed to access the NETLink

Switch.

TCP/IP address 3 and 4

Third and fourth IP addresses that are allowed to access the NETLink

Switch.

TCP/IP address 5 and 6

Fifth and sixth IP addresses that are allowed to access the NETLink

Switch.

TCP/IP address 7 and 8

Seventh and eighth IP addresses that are allowed to access the NETLink

Switch.

TCP/IP address 9 and 10

Ninth and tenth IP addresses that are allowed to access the NETLink

Switch.

TCP/IP address 11 and 12

Eleventh and twelfth IP that are allowed to access the NETLink

Switch.

SPS write Protection PLC write-protection ON or OFF

NETLink® Switch can be started both locally and remotely via the security interface. This is done by clicking the ‘Device Reboot’ button.

7.5 Observing variables

In addition to the “Observing Variables” function in the Simatic engineering tools, NETLink

Switch also provides this function via

the web interface.

Setting parameters of the observe variables function:

MPI address

An active MPI/PB address is selected using the dropdown menu.

Number of Variables

The number of variables to be observed can be selected from 1 to 10 for a clearer view.

No. Consecutive numbering.

Address Area

The following viewable items are supported: OB, OW, OD, IB, IW, ID, MB, MW, MD, DBB, DBW, DBD, counter, and timer.

Address Index*

Address of the bytes to be displayed. * On the case of data blocks with the form “Datablock.Offset”

Result Value

If one of the buttons is pressed, the output value will be displayed here

Display Format Display formats: decimal, hexadecimal, or binary Description Freely selectable description (max. 32 chars)

ebooting can take up to

15 seconds.

NETLink

Switch 44

The operating menu can be accessed via the ‘Observe Variables’ link. An RFC 1006 communications channel is assigned for these functions.

To display the desired values, you can use the ‘1x fetch’ button for a single value update or ‘cyclic fetch’ for a permanent online query.

With ‘Save Configuration’, it is possible to store the screen form you have created with all the variables and their descriptions in the NETLink

Switch.

NETLink

Switch 45

An example of display of various variables:

The value update is currently permanently set to 0.5 seconds. Even if multiple stations access this function from the TCP/IP end, only one connection resource is ever assigned in the NETLink

Switch. Moreover, data exchange via MPI/PB and/or RFC 1006, the ‘Observe Variables’ action has the lowest priority. The update time in the Web interface therefore depends on the concurrent bus load.

NETLink

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8 RFC1006 Function (S7-TCP/IP)

As an additional option, the NETLink® Switch can implement the RFC1006 protocol (also known as S7-TCP/IP or as ISO on top of TCP). RFC mode is always active and does not have to be specifically enabled. The NETLink

Switch automatically goes “online” as

soon as it detects an RFC frame.

Because many visualization system manufacturers have implemented this protocol to implement connections with CPs from Siemens (e.g. CP343 or CP443), NETLink

Switch with RFC1006 is a low-cost alternative to communication with these visualization systems.

The RFC1006 functionality of the NETLink

Switch is also sup-

ported by S7-200 systems.

The following software packages with RFC1006 support have so far been tested in conjunction with the NETLink products:

• WinCC V6.0/V7.0 (Siemens AG)

• WinCC flexible 2005/2007/2008 (Siemens AG)

• ZenOn V6.2 (COPA-DATA)

• PROCON-Win V3.2 (GTI Control)

• S7-OPC Server, V3.1 and higher (Systeme Helmholz GmbH)

• AGLink V4.0 (DELTALOGIC Automatisierungstechnik GmbH)

• INAT-OPC-Server (INAT GmbH)

• WinCE 5.0 Terminal TP21AS (Sütron Electronic GmbH)

• KEPserverEx V4.0 (KEPware Inc.)

• InTouch V9.5 (Wonderware GmbH)

Systeme Helmholz GmbH provides additional documentation on the subject of SCADA, HMI, and OPC (example applications) (for information see 11.3).

Please also observe the application-specific instructions in Troubleshooting and possibly in other relevant documentation

NETLink

Switch 47

9 Bus Parameters in Single Master Operation

If the NETLink® Switch is connected to a bus system on which no other master is active, the NETLink

generates the token itself. In which case it is then usually also necessary to adapt the relevant bus parameters.

The bus address with which the NETLink

Switch signs onto the

bus is entered in field “NETLink MPI/PB Address”.

The value for this address may be anywhere in the range 0 through 126. It is a precondition for this that the selected address is not larger than the HAS (highest station address) and is not already being used for another device on the bus.

9.1 Storing specified bus parameters

For bus profiles MPI and PPI, no other adaptations besides the baud rate are usually necessary. However, the DP setting must be configured carefully.

When parameterizing, please note that all parameters for PROFIBUS are interdependent. That is, if a parameter, e.g. the baud rate, is changed, all the other parameters usually also change.

For MPI, on the other hand, all parameters besides the baud rate are fixed. That is, if an MPI connection of increased from, say, from 187.5 Kbps to 12000 Kbps, all other parameters can/must remain unchanged.

The following parameters must be taken into account:

• Baud rate: The required baud rate is entered in

Kbps. For example ‘187.5’ or ‘12000’. The possible values are:

9.6; 19.2; 45.45; 93.75; 187.5; 500; 1500; 3000; 6000, and 12,000.

• HSA The highest station address is entered

here. For MPI generally ‘31’ and for PROFIBUS ‘126.’ However, any values can be used that are not equal to the default values.

• TSlot_Init This value is always ‘415’ for MPI –

whatever the baud rate. For PROFIBUS the appropriate value should be read from the PROFIBUS project.

• Ttr This value is always ‘9984’ for MPI –

whatever the baud rate. For PROFIBUS the appropriate value should be read from the PROFIBUS project.

• Max. Tsdr This value is always ‘400’ for MPI –

whatever the baud rate. For PROFIBUS

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Switch 48

the appropriate value should be read from the PROFIBUS project.

• Min. Tsdr This value is always ‘20’ for MPI –

whatever the baud rate. For PROFIBUS the appropriate value should be read from the PROFIBUS project.

• Tset This value is always ‘12’ for MPI –

whatever the baud rate. For PROFIBUS the appropriate value should be read from the PROFIBUS project.

• Tqui This value is always ‘0’ for MPI –

whatever the baud rate. For PROFIBUS the appropriate value should be read from the PROFIBUS project.

• Gap This value is always ‘5’ for MPI –

whatever the baud rate. For PROFIBUS the appropriate value should be read from the PROFIBUS project.

• Retry This value is always ‘2’ for MPI –

whatever the baud rate. For PROFIBUS the appropriate value should be read from the PROFIBUS project.

Please note that under unfavorable circumstances an incorrectly parameterized NETLink

Switch can interfere with the bus to the

extent that regular bus operation is no longer possible.

9.2 Addressing (rack/slot mode ON/OFF)

RFC1006 connections are virtual point-to-point links, that is, links from the PC to the programmable controller (possible branching within the programmable controller is handled by the CPU => Routing).

Because NETLink

Switch is a point-to-multipoint communication

adapter (‘PC to NETLink

Switch ’ on the one hand and ‘NETLink® Switch to many bus stations’ on the other hand), it was necessary to implement different addressing methods to permit all communication variations.

The addressing methods are ‘Addressed Mode’ (see Section

9.2.1)

and ‘Rack/Slot Mode’ (see Section 9.2.2).

These two addressing

methods, which are mutually exclusive,

permit most types of communication that are also possible via the NETLink-S7-NET.

ncorrect bus parameters can interfere with the bus considerably!

NETLink

Switch 49

9.2.1 Addressed mode

If di

fferent CPUs are to be accessed on the same MPI/PROFIBUS

via RFC1006, addressed mode is suitable.

If this mode is used, the following setting must be parameterized on the configuration page of the Web interface.

• ‚Rack/slot mode’ must be deactivated (OFF)

Ö Addressed Mode is active

The destination address now has to be entered in the RFC1006 driver of the Windows application (e.g. WinCC, see Section 9.3.1) ins

tead of the rack and slot.

Please note that the rack and slot together fill only one byte which is divided as follows:

• Rack fills the upper three bits

(11100000

bin

for Rack 7, Slot 0)

• Slot fills the lower five bits

(00011111

bin

for Rack 0, Slot 31)

If you now want to communicate with destination address 2, the following has to be entered:

Rack 0, Slot 2.

If you want to communicate with destination address 49, on the other hand, the following has to be set:

Rack 1, Slot 17.

Section 11.5 contains a table were you can read off already converted values for the rack and slot.

There are also parameterization tools that do not provide fields with names like rack and slot. These tools normally have a parameterization field with a name such as Remote TSAP that is usually two bytes long and in hex format. This field, in which only the lower byte is of interest, is parameterized as follows:

If you want to communicate with destination address 2, the following has to be entered:

Remote TSAP 0202

hex

If you want to communicate with destination address 49, on the other hand, the following has to be set:

Remote TSAP 0231

hex

Section 11.5 contains a table were you can read off already converted values for the Remote TSAP.

The formula Rack * 32 + Slot = Address can be used for simplicity.

9.2.2 Rack/slot mode

In r

ack/slot mode, it is possible to access specific modules of the

automation system.

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Switch 50

This is achieved by only communicating directly with one, preparameterized station. This station routes the data packets not intended for it to the required rack/slot and routes the response back to the NETLink

Switch.

This makes it possible, for example, to communicate in S7-400 systems with more than one CPU on a rack (ÖMulticomputing) without having to attach further CPUs to the bus.

To use this functionality, it is necessary to parameterize the following on the configuration page of the Web interface:

• ‚Rack/slot mode’ must be enabled (ON)

• For ‘Fix destination address for R/S mode’, the address of the re-

quired communication partner must be entered.

No special aspects have to be observed in the visualization system. The settings for the rack and slot or remote TSAP must be made as the described for the specific visualization system.

Section 9.3.1 explains addressed mode using WinCC as an example.

9.3 Example of configuration for WinCC V7.0

The basic parameterization of RFC1006 connections in visualization systems is explained here using the example of the WinCC V7.0 tool from Siemens AG.

It is assumed you are familiar with the development environment of WinCC, so that only points relating specifically to the connection need to be mentioned.

Because it is the Windows RFC1006 driver that is parameterized, all elements you will see in the WinCC example can also be found in similar form on other visualization systems/OPC servers that support RFC1006.

To explain the special aspects of communication with the NETLink

Switch, the same connection is explained once for addressed mode (see Section 9.3.1) and again in rack/slot mode (see Section 9.3.2).

9.3.1 Using addressed mode

For

the basics of addressed mode at the NETLink

Switch end, see

Section

9.2.1.

To parameterize a RFC1006 link in a WinCC project, a new TCP/IP link must first be created in the ‘SIMATIC S7 PROTOCOL

SUITE.’

NETLink

Switch 51

Here, this connection is called ‘NETLink.’

A click on ‘Properties’ takes us to a setting form in which the IP address of the NETLink

Switch and the rack/slot combination of

the destination have to be entered.

In this case, the NETLink

Switch has the IP address 192.168.4.49.

The destination CPU with which we want to communicate has the PROFIBUS address 49. Because addressed mode is to be used, we can read off the correct value for the rack and slot from the table in Section 11.5.

Under this connection we have just configured, we now have to create a variable.

The NETLink® PRO Com-

act has the IP address

192.168.4.49 on

delivery

NETLink

Switch 52

This is done by right-clicking to open the context menu of the new connection and selecting ‘New variable…’.

In the properties window of the variable, which was named ‘MB0_over_NETLink’ in this case, we can now select the type of variable by clicking the ‘Select’ button.

Marker byte 0 is configured here.

NETLink

Switch 53

The following screenshot shows that a variable named ‘MB0_over_NETLink’ now exists under the ‘NETLink’ connection.

If this variable is now included in the initial screen of the WinCC project, for example, a connection will be established to the CPU with address 49 via the NETLink

Switch to read or write marker

byte 0 from this address.

Further variables of different types can, of course, be created and used according to the same scheme.

It is also possible to create additional TCP/IP connections in order to communicate not only with the CPU with bus address 49 but also with other CPUs.

9.3.2 Use of rack/slot mode

For t

he basics of rack/slot mode at the NETLink

Switch end, see

Section 9.2.2.

To paramet

erize a RFC1006 link in WinCC, a new TCP/IP link

must first be created in the ‘SIMATIC S7 PROTOCOL SUITE.’

NETLink

Switch 54

Here, this connection is called ‘NETLink.’

A click on ‘Properties’ takes us to a setting form in which the IP address of the NETLink

Switch and the rack/slot combination of

the destination have to be entered.

In this case, the NETLink

Switch has the IP address 192.168.4.49.

The destination CPU with which we want to communicate is in Rack 0 on Slot. Because rack/slot mode we are going to use, WinCC does not have to announce the CPU address. Instead, the real values for rack and slot are specified, in this case rack 0 and slot 2.

Please note that the destination address, 49 in this case, must now be announced to the NETLink

Switch via the Web interface.

Under this connection we have just configured, we now have to create a variable.

The NETLink® PRO Com-

act has the IP address

192.168.4.49 on

delivery

emember to param-

eterize the NETLink

RO Compact.

NETLink

Switch 55

This is done by right-clicking to open the context menu of the new connection and selecting ‘New variable…’.

In the properties window of the variable, which was named ‘MB0_over_NETLink’ in this case, we can now select the type of variable by clicking the ‘Select’ button.

Marker byte 0 is configured here.

NETLink

Switch 56

The following screenshot shows that a variable named ‘MB0_over_NETLink’ now exists under the ‘NETLink’ connection.

If this variable is now included in the initial screen of the WinCC project, for example, a connection will be established to the CPU with address 49 via the NETLink

Switch to read or write marker

byte 0 from this rack 0, slot 2.

Further variables of different types can, of course, be created and used according to the same scheme.

It is also possible to create additional TCP/IP connections in order to communicate not only with rack 0 / slot 2, for example, but also with rack 0 / slot3. However, all the communication must go via bus address 49.

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10 Troubleshooting

The points described here show some typical errors that can occur in day-to-day work with the NETLink

Switch.

If any condition during operation is not described here and this manual does not provide any information on how to remedy it, the support of Systeme Helmholz GmbH is available to help you.

Q: I don’t know the IP address of my computer.

A: Enter the command ‘ipconfig’ after the prompt to show the

configuration of the Ethernet interfaces of your computer.

Q: My computer has a firewall. Which ports must I release?

A: The NETLink-S7-NET driver communicates with the NETLink

Switch via TCP port 7777. UDP ports 25342 and 25343 are also used to search for the NETLink

Switch devices. Please release at least port 7777 so that the basic functionality of the driver is available. If you use the RFC1006 functionality (also known as S7-TCP/IP), port 102 must also be released. ATTENTION: If you want to use the driver option ‘Internet teleser- vice’ (see Section 5.2.1), the specific ports configured there must also

be released because this port will be used instead port 7777.

Q: Both the configuration tool and the web interface ask me for a password and a user name. But I have never assigned a user name or password.

A: If no user name and/or password were/are specified, the default user name ‘NETLink Switch’ and the default password ‘admin’ are applied.

Q: Once the configured PROFIBUS slaves have been added on my CPU, communication between NETLink

Switch and STEP7 be-

comes markedly slower.

A: The user can influence the allocation of ‘cycle load due to com- munication [%]’ under object properties of the CPU in the hard-

ware configuration. The default value is 20 %.

Q: I get an error message when I access the controller.

The default user name is “NETLink Switch”

The default password is ‘admin.’

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A: The problem may be the setting of the PG/PC interface (e.g. PROFIBUS instead of MPI, address already allocated, etc.) or the NETLink

Switch if it is not connected or not accessible at this IP

address.

Make sure you have set the IP address correctly in the driver configuration. Please also enter the command PING <IP address> at the DOS prompt to check whether the NETLink

Switch can also

be accessed physically via the network.

Q: The setting dialog boxes are not appearing in the Simatic Manager:

A: Please note that after initial installation the NETLink-S7-NET driver must be added to the PG/PC interfaces. Make sure you had administrator rights during installation. Reboot your PC after installation if prompted to do so.

You need at least version 5.1 of the Simatic Manager.

Q: The Starter program has problems accessing a Micromaster drive.

A: When you request a ‘control priority’ for the Micromaster drive, please increase the Failure monitoring from 20ms to 200ms and the Application monitoring from 2000ms to 5000ms, so that the Starter software remains operable.

Q: Every time I execute a certain function, it fails and the red LED flashes.

A: An exception has occurred in communication. Please contact support and describe how the error can be triggered. The support team will attempt to solve the problem as quickly as possible.

Q: If I set the NETLink

Switch to auto baud in the PG/PC interface and try to go online, the active LED lights up briefly before a message appears telling me that the bus parameters cannot be determined.

A: Either the CPU used does not support the cyclic transmission of bus parameters (disabled via parameterization or function does not exist), or the CPU is so busy with general communication tasks that the lower-priority bus parameter frame is transmitted too infrequently and cannot be detected by the NETLink

Switch. Please deactivate the auto baud functionality in the NETLink-S7NET driver (PG/PC interface) and set the correct baud rate and the correct profile.

The NETLink® has the IP address 192.168.4.49 on

deliver

y f

rom the factor

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Q: The variables from my S7 200 CPU are not updated in my WINCC project.

A: The default settings of the system parameters in register SIMATIC S7 for Cycle Formation, Sign-of-Life Monitoring and CPU-Stop Monitoring must be deactivated.

Q: I use the rack/slot mode of the RFC1006 interface (rack/slot mode = ON) and have specified address 2 for my existing CPU in the Web interface in ‘Fix destination address for R/S mode.’ Although NETLink

Switch online is active (active LED lights up),

my visualization system tells me that no link can be established.

A: Make sure you have assigned the correct values to rack and slot in the parameterization. For example, to communicate with a CPU in a 300 rack, you must enter '0' for rack and '2' for slot. Many visualization system manufacturers have grouped together the two fields. In that case, there may be a field with the name 'Remote TSAP' containing a hex value such as '0102.' In this case, the hex value '02' stands for rack 0 and slot 2.

Q: I would like to use addressed mode of the RFC1006 interface (rack/slot mode = OFF) because that way I can access several CPUs on the same bus. Unfortunately I am not sure how to parameterize the fields rack and slot in the visualization used.

A: If addressed mode is used, a combination of rack and slot specifies the destination address of the automation system. If the CPU is to be addressed with bus address 2, the value 0 for the rack and the value 2 for the slot must be entered. Please note that the rack field consists of three bits and the slot field of five bits – i.e. together they comprise one byte and eight bits. That means, for example, the value 1 (00000001

Bin

; 01

Hex

) in

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the rack field must be entered for bus address 49 (00110001

Bin

;

Hex

) and the value 17 (00010001

Bin

; 11

Hex

) in slot field. For parameterization tools that offer a field with a name like ‘Re- mote TSAP’ for parameterization instead of separately parameterizable rack and slot fields, the value of the bus address can be entered directly without being taken apart and converted. For example, for bus address 2, the hex value ‘0102’ can be entered and for bus address 49 the hex value ‘0131.’ An address conversion table is given in Section 11.5 to simplify this task.

Q: If I mix RFC1006 connections and connections via the STEP7 driver, the link sometimes breaks off or error messages appear saying that it is not possible to establish a link.

A: For communication with S7-300 modules it may be necessary to parameterize the communication resources. The user can influence the allocation of existing ‘connection re- sources’ under object properties of the CPU in the hardware configuration.

Q: When the adapter is plugged onto the PROFIBUS, no online connection is possible.

A: If possible, use the auto baud functionality. If this is not possible or not desired, check the timing parameters for the PROFIBUS in the STEP7 configuration. Enter the read values into the advanced bus parameter settings via the ‘Bus parame- ters’ button. If on-line access is still not possible, set a higher ‘Ttr’ both in the NETLink

Switch and on the CPU.

Q: What should I look out for when implementing Internet teleservice via a router?

A: If the NETLink

Switch devices are in a private network behind a router, they cannot be addressed by their private IP address on the fixed NETLink

Switch port 7777 from the Internet. To be able to address the devices from the Internet despite this, a ‘public’ port is configured in the router for each NETLink

Switch.

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After that, access is possible via the public IP address of the router and the configured port.

By default, the S7 network driver attempts to address the NETLink

Switch via fixed port 7777, which would not work in the

above scenario.

For that reason the “Internet Teleservice” option has been installed in the SHS7-NET driver, with which the port of a NETLink

Switch

configured in the router can be set.

This configuration can be made in the ‘Station’ dialog box.

There is a detailed description of the settings for a ‘station’ in Section 5.1.2.

For explanations, see the figure above:

Private NETLink

address Æ Public NETLink® address

NETLink 1: 192.168.1.81 Port 7777 Æ 222.111.1.1 Port 1234

NETLink 2: 192.168.1.82 Port 7777 Æ 222.111.1.1 Port 1235

Q: What must I observe when calling your technical support?

A: Please have all relevant data of your system constellation with

the connected stations and program modules at hand when you contact technical support at Systeme Helmholz GmbH.

NETLink

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11 Appendix

11.1 Technical Data

Dimensions in mm (LxWxH) 75 x 83 x 35 Weight Approx. 180 g Operating voltage 24 V DC ±25 % Current consumption Approx. 120 mA Ethernet interface 10 Base-T / 100 Base-TX Ethernet connection 4 x RJ45 socket Ethernet transmission rate 10 Mbps and 100 Mbps MPI/PROFIBUS interface RS485, electrically isolated

MPI/PROFIBUS transmission rate

9.6 Kbps; 19.2 kbps

45.45 kbps 93.75 kbps

187.5 kbps 500 kbps

1.5 Mbps 3 Mbps 6 Mbps 12 Mbps

MPI/PROFIBUS connection

SUB-D connector, 9-way with programming unit interface and terminating resistor

MPI/PROFIBUS protocols

FDL protocol for MPI and PROFIBUS

Displays

3 LEDs, incl. 2 two-color, for general status information

2 LEDs on the 4 Ethernetports for Ethernet status

Degree of protection IP 20 Ambient temperature 0 °C ... 75 °C

Storage and transportation temperature

-25 °C to +75 °C

Relative humidity during operation 5 % to 85 % at 30 °C (no condensation) Relative humidity during storage 5 % to 93 % at 40 °C (no condensation)

11.2 Pin assignments

11.2.1 MPI/PROFIBUS interface pin assignments

Connector

Signal Meaning

1 - unused 2 GND Ground power supply (looped through) 3 RxD / TxD-P receive / transmit data-P 4 - unused 5 DGND Ground for bus termination (looped through) 6 DVCC 5 V DC for bus termination (looped through) 7 VCC 24 V DC for power supply (looped through) 8 RxD / TxD-N receive / transmit data-N 9 - unused

11.2.2 Assignment of the Ethernet interface (host interface)

Connector Signal Meaning

1 TX+ transmit data 2 TX- transmit data

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3 RX+ receive data 4 - unused 5 - unused 6 RX- receive data 7 - unused 8 - unused

NETLink® Switch comes with a shielded cross-over category 5 TCP cable with a length of three meters.

The maximum cable length between two TCP interfaces is 100 meters according to IEEE802.

If distances greater than 100 meters have to be covered, the use of additional switches or hubs is recommended.

11.2.3 Function overview of in

ternal switch

Ports 4 10Base-T/100Base-TX Ports

Auto negotiation

Auto uplink

Flow Control

MDI / MDI-X Auto Crossover

Performance 1.4 GBit/s Switching capacity

Address storage 1000 MAC addresses

LED’s Link, activity and speed

11.2.4 Power supply socket

Please make sure that the polarity is correct and all technical data are complied with.

11.3 Further Documentation

In addition to this manual, the accompanying CD includes additional documentation and example projects for your free use. You will always find further information or new and revised versions at: www.helmholz.de.

Selection as of 03/2010:

• Extended NETLink functions - Project-specific interface

• Communication with OPC, SCADA, HMI - Application exam-

ples with RFC 1006

• NETLink WebService – Application examples and software

• Extended NETLink functions – CPU-to-CPU communication

11.4 Information in the internet

http://www.helmholz.de

http://www.PROFIBUS.com

http://www.siemens.com

http://www.ietf.org/rfc

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11.5 Address conversion table

The following table is a parameterization aid for fining the correct setting for rack/slot or for remote TSAP in addressed mode.

Bus-adr.

Rack

Slot

TSAP Bus-adr.

Rack

Slot

TSAP Bus-adr.

Rack

Slot

TSAP Bus-adr.

Rack

Slot

TSAP

0 0 0 0200 32 1 0 0220 64 2 0 0240 96 3 0 0260

1 0 1 0201 33 1 1 0221 65 2 1 0241 97 3 1 0261

2 0 2 0202 34 1 2 0222 66 2 2 0242 98 3 2 0262

3 0 3 0203 35 1 3 0223 67 2 3 0243 99 3 3 0263

4 0 4 0204 36 1 4 0224 68 2 4 0244 100 3 4 0264

5 0 5 0205 37 1 5 0225 69 2 5 0245 101 3 5 0265

6 0 6 0206 38 1 6 0226 70 2 6 0246 102 3 6 0266

7 0 7 0207 39 1 7 0227 71 2 7 0247 103 3 7 0267

8 0 8 0208 40 1 8 0228 72 2 8 0248 104 3 8 0268

9 0 9 0209 41 1 9 0229 73 2 9 0249 105 3 9 0269

10 0 10 020A 42 1 10 022A 74 2 10 024A 106 3 10 026A

11 0 11 020B 43 1 11 022B 75 2 11 024B 107 3 11 026B

12 0 12 020C 44 1 12 022C 76 2 12 024C 108 3 12 026C

13 0 13 020D 45 1 13 022D 77 2 13 024D 109 3 13 026D

14 0 14 020E 46 1 14 022E 78 2 14 024E 110 3 14 026E

15 0 15 020F 47 1 15 022F 79 2 15 024F 111 3 15 026F

16 0 16 0210 48 1 16 0230 80 2 16 0250 112 3 16 0270

17 0 17 0211 49 1 17 0231 81 2 17 0251 113 3 17 0271

18 0 18 0212 50 1 18 0232 82 2 18 0252 114 3 18 0272

19 0 19 0213 51 1 19 0233 83 2 19 0253 115 3 19 0273

20 0 20 0214 52 1 20 0234 84 2 20 0254 116 3 20 0274

21 0 21 0215 53 1 21 0235 85 2 21 0255 117 3 21 0275

22 0 22 0216 54 1 22 0236 86 2 22 0256 118 3 22 0276

23 0 23 0217 55 1 23 0237 87 2 23 0257 119 3 23 0277

24 0 24 0218 56 1 24 0238 88 2 24 0258 120 3 24 0278

25 0 25 0219 57 1 25 0239 89 2 25 0259 121 3 25 0279

26 0 26 021A 58 1 26 023A 90 2 26 025A 122 3 26 027A

27 0 27 021B 59 1 27 023B 91 2 27 025B 123 3 27 027B

28 0 28 021C 60 1 28 023C 92 2 28 025C 124 3 28 027C

29 0 29 021E 61 1 29 023D 93 2 29 025D 125 3 29 027D

30 0 30 021F 62 1 30 023E 94 2 30 025E

31 0 31 0220 63 1 31 023F 95 2 31 025F

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12 Glossary

These are explanations of the most important technical terms and abbreviations from the manual.

Advanced PPI

The extension of the PPI protocol of the S7-200 series, normally only compatible with CPUs of the S7-22x ser

ies and higher

ANP See auto negotiation

CII American Standard Code for Information Interchange describes a character

set that includes the Latin alphabet in upper and lower case, the ten Arabic numerals, as well as some punctuation marks and control characters

Autobaud Also called "auto sensing," is a function supporting automatic adjustment

of the baud rates in a network

Auto negotiation

ANP describes a function that automatically recognize

s and configures

communication partners in the network

Baudrate The speed set on a bus system

Bit

Binary digit describes the smallest digital information unit. Defines 0 or 1

Broadcast Data packet transmitted to all stations in a network

Browser Also known as Web browser, is a program for viewing Internet pages. In

addition to addressing and referencing other positions in the text, a graphical user interface be displayed, for example Web interface.

Bus

Buses are connection systems for electronic components. For example, the MPI Bus is a connection medium for S7

Byte

A byte denotes a series of 8 bits that constitute a logical data entity

CAT5-TCP cable

Category 5

Ethernet cable that supports a data rate of 100 Mbps over a dis-

tance of 100 m

Client A device that requests services. The requests are sent to a server, which re-

turns the relevant answers to the client.

Computer

In this manual, this refers to the programmer (PG) or personal computer

(PC).

DHCP Dynamic Host Configuration Protocol, DHCP server can dynamically pass

an -> IP address and other parameters to DHCP clients on request.

DNS

Domain Name System is a shared database system in LAN as well as in the

internet that transf

orms IP addresses into plain text addresses

Domai

name

The domain is the name of an Internet page. It consists of the name and an extension. The domain of Systeme Helmholz is: www.helmholz.de

Firewall A service running on a server that blocks certain services/ports and prohib-

its unauthorized access

Flow Control:

A proce

ss that sends a break frame if the data buffer is almost full.

Gap The Gap Update Factor specifies after how many token cycles the master

checks whe

ther an additional master is signaling its presence on the bus

Gateway

This is a machine that works like a router. Unlike a router , a gateway can als

o route data packets from different hardware networks.

NETLink

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HMI Human-Machine Interface denotes the interface between the human op-

erator and a system through which the operator can operate the system or intervene in the process

HSA Highest station address that is polled

Hub A mediation system between LAN segments. Unlike a switch, on a hub, all

data arising in the Ethernet are applied to all ports

Interf

aces General definition of interfaces, such as a network interface card that con-

stitutes an Ethernet interface

IP address Internet protocol address. The IP is the address of a device in a network at

which it can be reached. It consists of four bytes and is expressed in decimal notati

on. Example: 192.168.4.49

ISO on top of TCP

see RFC1006

LAN

Local area network, a network of computers that are relatively close to each other physically.

MAC address

The Media Access Control address is used only once for each single network component that is not changeable. It consists of 6 bytes and is written in hexadecimal notation. Example: 08-FF-FA-9C-ED-

Master Is and active station that is permitted to transmit data to and request data

from other stations, when it holds the token

MDI / MDIX Auto Crossover

Makes it po

ssible to identify if a cross over or a straight cable is connected

and configures the port accordingly.

MLFB 16-digit Siemens identification number

MPI Multipoint Interface. Interface that is used for S7-300 and S7-400 systems

and that supports baud rates up to 1.5 Mbps

NAT Network Address Translation is the collective term for procedures for re-

placing address information in data packets by other address information in an automated and transparent way. This is very useful when connecting private networks via a public line.

Net mask See subnet mask

Network rules

Netw

ork rules determine how the different data packets are handled in a network device. For example, data packets are blocked or forwarded to or from certain network stations

OPC Object Linking and Embedding for Process Control allows data transfer

between applications of different producers, for example, using the RFC1006 prot

ocol

PAT Port address translation. Used when multiple private IP addresses of a LAN

need to be t

ranslated into one public IP address

PG socket

The programming unit socket of the bus connector allows further bus nodes to be plugged in.

Port These are address components that are used in network protocols to assign

the correct protocols to data segments, also using port forwarding.

Port for

warding

The passing on of requests to ports via a network.

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PPI Point-to-point interface, interface with S7-200 systems with a maximum

baud rate of 187.5 kbps

PRO

FIBUS Process Field Bus is the protocol that is used mainly for automation, e.g.

for the S7-300 and S7-400 systems with a maximum baud rate of 12 Mbps

Profinet Standard for industrial Ethernet in automation.

Proxy System for buffering. Requests can be answered faster via a proxy, and the

network load can also be reduced. Mainly used to separate a local area network from the WWW.

Rack/Slot Rack refers to the configured module rack (default: 0) and slot, to the slot

for the module in question (default CPU: 2). The default configuration for an R/S is therefore 0/2

Retry limit Bus parameter that determines the number of attempts will be made to call

a DP slave

RFC10

06 Request for comment is a type of protocol. It defines the way an ISO

packet is transported in a TCP data packet as “useful load”

RJ45 socket A network socket with 8 wires according to the RJ plug system

Router This is a machine that ensures in a network that the data of a protocol ar-

riving at it are forwarded to the intended destination network or subnet.

outing Routing means a defined function that mediates messages and data be-

tween LANs, WANs, MPI, and PROFIBUS

7-TCP/IP Interface parameterization in the PG/PC interface that is based on TCP/IP

and that is

handled via the selected network interface card of the PC

SCADA Supervisory Control and Data Acquisition. Generic term for a type of proc-

ess visualization that includes monitoring, control, and data acquisition of automation systems, etc.

Server A device that provides special services at the request of clients.

Single master

Only one master is connected to the system. The NETLink

family mem-

bers WLAN, Switch, and PRO Compact can also act as single masters

Slave A station that is only permitted to exchange data with the master if re-

quested to do so by the latter.

Socket

Data links that are created by means of ->TCP or ->UDP work with sockets for the addressing purposes. A socket consists of an IP address and a port (cf. address: street name and house number)

Subnet mask Defines the network or host component of the IP address. It permits sub-

divi

sion of address ranges and prevents direct access to other networks.

Switch A device that can connect multiple machines with Ethernet. Unlike a hub,

a switch i

s “smart” in that it can remember the MAC addresses that are

connected t

o a port and routes the traffic more efficiently

than the indi-

vidual ports

TCP/IP

The Transmission Control Protocol is a transport protocol to permit data exchange between network devices. IP is the extension for Internet Protocol.

Timeout Defines a protocol instruction that is activated if a defined time has been

exceeded

Token Is a frame for permission to transmit in a network. It is passed from master

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to master

Tqui

Transmitter fall time (bit) is the time that is needed to restore the quiescent signal level on the signal line after transmitting data

TSAP Transport Service Access Point. The TSAP corresponds to the layer 4 ad-

dress that has to match crossed-over for a station and the communication partner to be reached. The remote TSAP of Station1 is equivalent to the local TSAP of Station2. Entry of any characters, e.g. numerals is possible

Tsdr Protocol processing time of the responding station (station delay re-

sponder)

Tset The setup time (bit) is the time that is allowed to elapse between transmit-

ting and receiving telegrams

Tslot_Init The slot time (bit) is the maximum time that a transmitter waits for a sta-

tion it has addressed to respond

Ttr Target rotation time (Bit) is the reference token time. This means teh refer-

ence and actual token times are compared. This difference determines how much time is available

to the master to transmit its own telegrams to the

slaves

UDP

User Datagram Protocol, transport protocol permitting data exchange between network devices. It is a connectionless protocol, that is, data transmission is performed without error detection.

URL “Uniform Resource Locator,” denotes the address at which a service can be

found in the Web browser. In this manual, the IP address of the NETLink

Switch is usually entered as the URL.

VPN Virtual Private Network. Logical links, called tunnels, are established iva

existing unsecured networks. The end points of these links (“tunnel ends”) and the devices behind them can be thought of as a separate, logical network. A very high level of security against tapping and tampering can be achieved if data transmission via tunnels is encrypted and the stations in this logical network first authenticate each other.

WAN Wide Area Network, a network of computers that are physically far apart.

The internet is the largest known WAN

Web interface

Is opened using a browser. It contains the data and functions to be able, for example

, to interact with the NETLink

Switch.

WWW World Wide Web. Worldwide communication network, also known as the

Internet.

NetLink 700-883-PRO42 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual