FLOWCOMP GAS-NET C2 Leitfaden

2007 Elster GmbH September 2007

DSfG Gateways C1 and C2

Series 2

Technical Documentation

Function, operation,

commissioning and maintenance

gas-net C1 and C2

Page ii

2007 Elster GmbH

GAS-WORKS, Z1 and FLOW COMP are German registered

trademarks of FLOW COMP Systemtechnik.

Microsoft, Windows and Windows NT are registered trademarks

of Microsoft Corporation.

Elster GmbH

Schlossstrasse 95a

D - 44357 Dortmund, Germany

Tel.: +49 - 2 31 - 93 71 10 0

Fax: +49 - 2 31 - 93 71 10 99

E-Mail: [email protected]

gas-net C1 and C2 Page iii

Contents

Safety and warning notes....................................................................................v

General Notes on the Structure of this Manual .................................................. vi

1Introduction ..............................................................................................1-1

1.1 The gas-net system idea..................................................................1-1

1.2 The gas-net DSfG gateway..............................................................1-1

2How the gas-net DSfG Gateway works....................................................2-1

2.1 Host job list (Data exchange module)...............................................2-2

2.2 DSfG job list (DSfG module) ............................................................2-2

2.3 Foreign Protocols Module (for C2 devices only)...............................2-3

2.4 Simulating a gas quality entity via DSfG

(Gas quality simulation module).......................................................2-3

2.5 Counters module..............................................................................2-4

2.6 Integrated RDT Module (for C2 devices only)..................................2-7

3Device view and design ...........................................................................3-2

4GW-GNET+..............................................................................................4-1

4.1 Creating and exporting a gas-net parameter data record:

Brief description................................................................................4-1

4.2 Importing and editing a parameterisation: Brief description..............4-3

4.3 Extras: GW-GNET+ service programs .............................................4-5

5Installation................................................................................................5-1

5.1 Mounting the gas-net C1 / C2 ..........................................................5-1

5.2 Line Connection ...............................................................................5-1

6Commissioning.........................................................................................6-1

6.1 Device Parameterisation..................................................................6-1

6.2 Commissioning of the Gateway........................................................6-1

6.3 Commissioning the Integrated RDT .................................................6-2

7Maintenance.............................................................................................7-1

gas-net C1 and C2

Page iv

7.1 Battery Replacement .......................................................................7-1

8Technical data: gas-net C1 and C2 .........................................................8-1

9Annex.......................................................................................................9-1

9.1 Host protocols..................................................................................9-1

10 Bibliography...........................................................................................10-1

11 Index......................................................................................................11-1

gas-net C1 and C2 Page v

Safety and warning notes

Attention! The following safety and warning notes must be

observed:

The gas-net C1 and C2 devices must neither be stored at temperatures

below -20°C nor above +50°C.

A temperature between 0°C and +40°C must be guaranteed during

operation.

The gas-net C1 and C2 devices must be installed outside ex-zone 2.

The power supply of the gas-net devices is 24 V DC and must be

secured externally by 1 A.

The earthing is connected to PE of the power supply socket for

equipotential bonding.

Observe the regulations of the relevant standards, in particular the

regulations of DIN EN 50014, DIN EN 50020 and DIN EN 50039.

gas-net C1 and C2

Page vi

General Notes on the Structure of this Manual

The documentation on hand describes the gas-net C1 and C2 DSfG Gateways.

As the description holds mostly for both devices, C1 and C2, we refer generally

to the device 'gas-net DSfG gateway'.

In short, the functional differences between C1 and C2 are the following:

The C2 device is available in a mounting width of 1/3 and 1/2 (the C1 has a

mounting width of 1/6) and is therefore able to provide more communication

interfaces. (Several additional foreign digital protocols are supported as

well.)

The C2 supports the functionality Integrated RDT for establishing a data

connection between the gas-net device and a remote center. This function-

ality uses the public switched telephone network or GSM wireless network,

a serial direct connection, or TCP.

If a functionality is not available for the gas-net C1, it will be explicitly stated in

the text.

Introduction 1

gas-net C1 and C2 Page 1-1

1 Introduction

1.1 The gas-net system idea

is the generic term for a whole device family. All gas-net devices,

including future device types, stand out due to a uniform

appearance, operation and parameterisation.

The FLOW COMP devices, each by itself, always cover a multitude of measure-

ment and control functionalities.

gas-net devices also provide this functional variety. To keep the operation and

parameterisation of the devices well structured and user-friendly, the gas-net

series is based on a modular concept. A module corresponds to a specific func-

tionality, and to each module belongs a group of settings within the parameter

data record. The DSfG gateway gas-net C1, for instance, includes the modules

System, DSfG, Data exchange, Counters, and Gas quality simulation.

A particular module can be employed in different device types. This yields a

modular system that is advantageous to the user as a particular module can

always be operated and parameterised in the same way, no matter in which

device type it has been installed.

1.2 The gas-net DSfG gateway

The DSfG protocol is a digital data protocol, especially developed for the com-

munication between gas metering devices in gas measuring and regulating

stations. However, such gas measuring and regulating stations often also con-

tain a PLC (programmable controller), the tasks of which comprise the open-

and closed-loop control of the station and telecontrol interfacing to a telecontrol

centre. Most of the PLCs are not DSfG-capable but use other digital communi-

cation protocols1. Consequently, they cannot be simply included in the DSfG

bus.

The gas-net DSfG gateway solves this problem: This device is connected to the

DSfG bus on the one side and on the other via a digital connection to the PLC

called host in the following.

1Typical protocols are, for instance, 3964R/RK512 (e.g. in case of Siemens S5/S7) or

Modbus-RTU (e.g. in case of Cegelec Modicon).

1Introduction

gas-net C1 and C2

Page 1-2

Data logging

Correction

Host

DSfG

bus

DSfG

Gateway

digital

connection Telecontrol line

Telecontrol centre

Typical system structure with an integrated gas-net C1 DSfG gateway

In summary, the gas-net DSfG gateway accomplishes the following tasks:

Cyclic or event-driven data polling at DSfG stations. Conversion of this data

into the host protocol, and its transmission to the host computer.

Cyclic or event-driven data polling at the host computer. Conversion of this

data into the DSfG protocol, and its transmission to DSfG stations.

Simulation of a gas quality entity towards the DSfG bus using gas quality

data provided by the host.

Method of operation 2

gas-net C1 and C2 Page 2-1

2 How the gas-net DSfG Gateway works

The illustration below shall explain how the gas-net DSfG Gateway works in

principle. The comprehension of the way the gas-net gateway works is essential

for the following description of the device operation and parameterisation.

DSfG

Bus DSfG

Gateway

Host

Transfer

memory,

Calculations

Import values

Export values

DSfG job list

Export values

Import values

Host job list

Structure of a gas-net C1 DSfG Gateway

The gas-net gateway cyclically executes a job list for the DSfG side and one for

the host side, one independent of the other. The results of import jobs are al-

ways stored as data points in a transfer memory, whereas export jobs always

take their data points from the transfer memory that has been filled before. The

job lists themselves are generated by a PC during commissioning and para-

meterised in the gateway.

To a limited extent, the gas-net DSfG Gateway can also calculate with the data

points of the transfer memory. This function will be described in the following

chapters, too.

2 Method of operation

gas-net C1 and C2

Page 2-2

2.1 Host job list (Data exchange module)

The job list of the host describes all data flows to be processed between host

and gas-net DSfG Gateway. The system distinguishes between the flow direc-

tion to the host (data export) and the flow direction from the host (data import).

The data transport in the direction to the host is processed cyclically. If a new

value arrives from the DSfG side, the associated export value will be updated. In

addition to the specification of the destination in the host, the description of the

export value also defines the way of positioning the data point in the host (e.g.

size, scaling, limits, bit position).

A particular import value describes for the reverse data flow direction from which

position in the host a data point shall be collected and in which way it shall be

converted. It can be parameterised whether the transmission to the DSfG side

shall be performed cyclically or event-driven.

Any number of import values from the host can be combined to a job group. All

data points of a job group are always put into the transfer memory altogether

and simultaneously, but only after all of them have been collected again once

more. Moreover, a job group may be linked with a trigger. A trigger is a defined

position within the host. It initiates a new processing of a job when its content

has changed.

2.2 DSfG job list (DSfG module)

The DSfG job list describes all data flows to be processed between the DSfG

stations and gas-net DSfG Gateway. The system distinguishes between the flow

direction to DSfG stations (export values) and the flow direction from DSfG sta-

tions (import values).

A particular import value for a DSfG station describes the DSfG data element

that shall be collected and put into the transfer memory. For this, any numerical

data element provided by the addressed station can be addressed, without

exception.

Several import values of one and the same DSfG station are combined to a job

group, a so-called query telegram. All data elements of a query telegram are

collected via DSfG queries and thus always put into the transfer memory al-

together and simultaneously. DSfG import groups also comply with some spe-

cial features of the DSfG regulations relating to the telegram traffic. For in-

stance, it is possible to process query telegrams either cyclically or upon the

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