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Annex

Page 9-4

gas-net

C1 and C2

9.1.2 MODBUS RTU / MODBUS ASCII

The Modbus protocol is supported, for instance, by the PLC series of AEG

Modicon.

The data presentation according to the Modbus protocol is one-dimensional.

The smallest data unit in the memory consists of 16 bits. The protocol contains a

number of registers, which are numbered consecutively from 0 up and each of

which may contain exactly such a 16-bit word. In each individual case the num-

ber of registers depends on the size of the memory available on the host side.

The positions of the import and export values of the host are indicated as serial

gas-net

Gateway, too. These

lead to different register numbers in the PLC, depending on the host type.

Communication protocol:

Based on Modbus RTU/Modbus ASCII

according to the

Modicon Modbus Protocol

Specification

(Jan. 1991, MODICON Inc.),

point-to-point.

Interface:

V24 with PC/AT pin assignment at the

gas-net

device.

Transmission rate:

adjustable to 2400, 9600, 19200 or 38400 baud

Transmission parameters:

Modbus RTU 8 data bits, Modbus ASCII 7 data

bits.

Even parity, 1 stop bit pre-allocated.

Modbus telegrams:

Maximum of 250 bytes (125 register words) per

telegram.

Only the Modbus telegram types 03 and 16 are

supported.

Modbus response

telegrams:

In the gateway = slave operating mode, the

gateway generates response telegrams when

an error occurs. These telegrams are listed in

the table below:

Содержание GAS-NET 2 Series

Страница 1: ... 2007 Elster GmbH September 2007 DSfG Gateways C1 and C2 Series 2 Technical Documentation Function operation commissioning and maintenance ...

Страница 2: ...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 systems elster instromet com ...

Страница 3: ... 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 3 Device view and design 3 2 4 GW 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 5 Installation 5 1 5 1 Mounting the ...

Страница 4: ...gas net C1 and C2 Page iv 7 1 Battery Replacement 7 1 8 Technical data gas net C1 and C2 8 1 9 Annex 9 1 9 1 Host protocols 9 1 10 Bibliography 10 1 11 Index 11 1 ...

Страница 5: ...e 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 E...

Страница 6: ...able 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 o...

Страница 7: ...s 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 ga...

Страница 8: ...he 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 usi...

Страница 9: ...ues 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 gener...

Страница 10: ... 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 DSf...

Страница 11: ...he gas quality data is injected via the telecontrol system the gateway may inject this remotely provided gas quality data in the DSfG bus as if it were a gas 2 According to the DSfG specifications the DSfG entities may generate attention telegrams in case of special events These attention telegrams are routed to all devices on the bus as multi address message 3 A DSfG standard query serves to coll...

Страница 12: ...c or FLOWSIC ultrasonic gas meter or a meter with a pulse inter face or come in via a digital protocol from an external source e g via DSfG or MODBUS If the incoming count value possibly determined based on the flow rate is a volume it can be multiplied by a conversion factor to create the counter This way a counter for the base volume energy or mass can be created based on an input of the volume ...

Страница 13: ...ace by means of the GW GNET soft ware during an online connection The setting of totalizers is subject to the user lock numeric code The Counters module is able to file up to 100 counters 2 5 2 Counters Intercalating Totalizers If an input totalizer comes in via a digital protocol only at regular intervals the option Intercalate totalizer is available to achieve that the counter increases continuo...

Страница 14: ...ed as setting In such a case too the new totalizer will be immediately transferred to the intercalated totalizer and the creation of the intercalated totalizer will be started anew Furthermore the intercalation of the intercalated counters is stopped below a flow rate of 1 10 of the maximum flow rate In such a case only the totalizers being supplied via the protocol will be transferred to the inte...

Страница 15: ...a Transmission module implements the data connection between the gas net device and a remote center The center accesses the data traffic as a logical equal access station via the integrated RDT during an established data connection The data transmission is imple mented according to DSfG specifications by means of a Class B DSfG interface If the device is equipped with a DSfG interface further devi...

Страница 16: ...ch a way that a special event e g a correction alarm will trigger a call at the center This works as follows Accord ing to the DSfG Specification the entities generate Attention telegrams that are forwarded to all other stations in form of a multi address message in case of special events It is possible to separately define for each station that the center will be informed spontaneously in case of...

Страница 17: ...spontaneously called and informed For this the integrated RDT has to know the center s telephone number Furthermore it is possible to synchronize the internal device time via the inte grated RDT if there is a server reachable by telephone and providing the time via telephone in accordance with a defined protocol Should you be interested please consult Elster Instromet systems to clarify the usabil...

Страница 18: ...T Like in case of the telephone dial up network the connection set up may be initiated by the center or local RDT In addition to the IP addresses of RDT and center the values for the subnet mask and gateway usually used in the IP world and the port to be used for the transmission are special parameters of the TCP connection In case of this operating mode the preferred service for time synchronizat...

Страница 19: ...switch is open cf Chapter 4 1 The DSS data interface for the connection of a PC or laptop for servicing pur poses The following illustration shows as an example the front view of a gas net C1 narrow design with a mounting width of 1 6 Data interface DSS Pushbutton for triggering general pollings User switch Close the user switch by turning it clock wise as far as it will go Status LEDs Master glow...

Страница 20: ...64R TCP IP for integration in a standard network installation for data exchange via Modbus TCP or time synchronization via NTP Additionally the C1 provides a slot for a gas net process board typically a serial process board MSER2 is installed here A gas net C2 device with a mounting width of 1 3 accommodates up to four process boards The illustration below shows a typical rear view of a C2 device ...

Страница 21: ...ontext sensitive online help of GW GNET in case of concrete questions 4 1 Creating and exporting a gas net parameter data record Brief description Should you want to create a completely new gas net parameterisation please proceed as follows 1 Start GW BASE from the Windows environment by double clicking the lantern icon 6 Please refer to the GAS WORKS CD ROM which is part of the delivery scope of ...

Страница 22: ...e settings according to your requirements Tip There is a corresponding topic for every adjustable parameter within the context sensitive online help mark the parameter and press Ctrl F1 5 Go through all modules in this way until all adjustments meet your demands 6 Select File Save as and enter the name under which the parameter data record shall be saved in GAS WORKS Close GW GNET for instance via...

Страница 23: ...n You can read out the current parameterisation of a gas net device via the data interface and edit it afterwards The following description explains how to read the parameterisation into your computer 1 Connect the COM interface of the computer to the DSS interface at the gas net device using a parameterisation cable 2 Start GAS WORKS on your computer if it has not been started already Activate th...

Страница 24: ...ameter data record in the configuration window of GW BASE 2 Select Data Edit from the main or context menu GW GNET starts 3 Edit the parameterisation according to your demands 4 Save the changes you made By clicking Save you save the data record under its old name If you select the Save as menu item you can save the data record under a new name In this case the newly created data record is transfe...

Страница 25: ...OTE via the data interface if installed Facilitates the data access to all devices connected via DSfG for instance for reading out archive data and viewing current data These programs may only be activated via the DSS data interface with the data connection being established Proceed as usual 1 Start GW BASE on your laptop 2 Connect the DSS interface of the gas net device to a COM interface of the ...

Страница 26: ......

Страница 27: ...device is implemented via plug gable screw terminals each of which is located in a cable terminal box The power supply is connected via fixed screw terminals Data lines have to be con nected to the according SUB DB9 connector housings Please consider the relevant installation guidelines when arranging the wiring The lines must be tensile stress free and must be provided with a bend protec tion if ...

Страница 28: ...ion of a host computer via RK512 3964R or MODBUS protocol or the connection of a GPS receiver for the time synchroni zation Notes When RS422 and RS485 are used a terminating resistor of 120 ohms may be required in the receiver between RXB and RXA depending on the cable length In case of RS485 you have to externally connect RXB to TXB and RXA to TXA Please pay attention to the specification of the ...

Страница 29: ...net mask and gateway address must be parameterized for an adequate integration in the existing network infrastructure Please pay attention to the fact that the IP address must be unambiguous in the subnet Please ask the network administrator for the subnet mask and gateway address The use of an STP CAT5 network cable not transposed is mandatory The pin assignment of the RJ45 socket corresponds to ...

Страница 30: ...ror protocol conversion according to MNP4 and V42 respectively In order to be able to select the correct antenna check the data signal qual ity on site for instance check the field strength by means of a normal mobile phone Also check the installation possibilities for the antenna Especially consider the characteristics of the building An external installation is always prefer able Attention is to...

Страница 31: ...ireless Modem Have the PIN number at hand if required After having installed the antenna connect it to the modem using the an tenna cable The antenna must be aligned to the maximum receiving level except for the case that the antenna is an omnidirectional one Note The further commissioning of the integrated RDT with wireless modem is described in Chapter 6 3 It is especially important for the furt...

Страница 32: ...ern plug of the con necting cable in such a way that the locking catch is at the front and pointing upwards Look at the clamped cable There are 6 wires The assignment of the wires from left to right can be seen from the illustration on the right 11 In this way it is also possible to assign the color coding correctly at the open end of the cable and to connect the voltage supply correctly Note Wire...

Страница 33: ...onnector marked DSfG on the back of the gas net device Also pull off the connector that establishes the connection to the host at COM2 If necessary consult the specifications of your DSfG bus installation for the intended position of the end of line resistors A bus termination or open cir cuit generation is not necessary if exclusively gas net devices are con nected to the DSfG bus If you connect ...

Страница 34: ...polling on the front of the gas net DSfG gate way The LEDs Transmission Reception are flashing alternately Even after quite some operating time has elapsed the Polling Fault LED must not glow unless you have changed the number of bus stations for this would indicate that the bus structure is erroneous or some bus stations are unreliable Check possibly by means of a make dependent host programming ...

Страница 35: ...ly after start up If the initialization fails you will regularly receive No modem status mes sages between the individual initialization attempts Check the modem set tings of your parameterization in this case Once the initialization has been successful the status indication will change from Modem initialization to Basic status 4 If there is a local DSfG bus plug in the connector marked DSfG on th...

Страница 36: ...ger an event that induces the RDT to call first for instance a correction module alarm The main menu of the Integrated RDT module indicates the RDT s status change Once a data connection has been established and data has been exchanged the RX and TX LEDs keep blinking irregularly on the back of the device 6 After the connection to the center has been terminated successfully check the telephone con...

Страница 37: ... the initialization fails you will regularly receive No modem status mes sages between the individual initialization attempts Check the modem set tings of your parameterization in this case Once the initialization has been successful the status indication will change from Modem initialization to Basic status If the status indication shows the text RDT not in operation the SIM card could not be rec...

Страница 38: ...G bus exists 2 Remove the network connector from the respective socket at the gas net device Go to the main display of the Integrated RDT module It shows the current status of the RDT The device will try to initialize the integrated network module directly after start up If the initialization fails you will regularly receive Module error status mes sages between the individual initialization attem...

Страница 39: ...the connection 5 After the connection has been successfully established by the center the network connection has possibly to be checked in the other direction af terwards This step has only to be taken if DSfG related events shall spontaneously be signalized to another center via the network This center must be able to receive DSfG calls via network In this case the RDT wants to establish the conn...

Страница 40: ......

Страница 41: ...he distributor Elster Instromet Systems or handed in at special battery take back facilities To exchange the battery you need to open the housing of the gas net device Proceed as described below A battery of the following type is required lithium 3V CR AA Save the device parameterization by reading it out with GAS WORKS to be on the safe side Read out the archives too Disconnect the supply voltage...

Страница 42: ...y pay attention to the correct polarity The positive pole must point downwards A wrong polarity will not be noticed at first but during the next power failure that lasts more than 15 minutes the device data will be lost Re assemble the device and connect the supply voltage ...

Страница 43: ...ameterization Optional DSfG interface for data transmission between gas net devices Optional COM2 interface serial interface to RS232C for connecting the host maximum transmission rate 38400 baud In case of a C2 device the COM2 interface may alternatively be used for con necting a modem with a maximum transmission rate to V 34 bis 33600 baud and data compression to V 42 or NMP5 Integrated RDT func...

Страница 44: ...hnical Data Page 8 2 gas net C1 and C2 Parameterization Commissioning and parameterization via the PC software GAS WORKS Para meter data records can be stored documented and managed in the PC under GAS WORKS ...

Страница 45: ... 256 larger units data blocks each of which may contain up to 256 data words Data blocks and words are numbered consecutively from 0 to 255 with the numbers serving as addresses A single data word is clearly defined by exactly three details the address of the data block 0 255 the address of the data word 0 255 the content of the data word The addresses to be assigned to the host data in the gatewa...

Страница 46: ...lock assignment is carried out via the gateway parameterisation However at least the agreed data blocks and the basic protocol functionality must be defined in the host of course The communication between the host and the gas net DSfG gateway is subject to several basic requirements The following list provides a summary Communication protocol RK512 3964R point to point Interface V24 with PC AT pin...

Страница 47: ...ressed data is longer than the addressed data block 10H Instruction 2 The second instruction letter is wrong Here only D for DB is permitted 11H Access not permitted A telegram with data has been sent but no access rights for its DB DW area exist 16H Instruction 1 The first instruction letter is wrong Only A for SEND and E for FETCH are admissible 34H Telegram length The telegram that arrived was ...

Страница 48: ...f the gas net Gateway too These register details always refer to the MODBUS telegram presentation which may lead to different register numbers in the PLC depending on the host type Communication protocol Based on Modbus RTU Modbus ASCII according to the Modicon Modbus Protocol Specification Jan 1991 MODICON Inc point to point Interface V24 with PC AT pin assignment at the gas net device Transmissi...

Страница 49: ...rmissible i e it is neither of the 03 nor of the 16 telegram type Only Modbus telegram types with the functional numbers 03 read holding registers or 16 preset multiple registers are needed in the gateway this why only these are supported 02 illegal data address The indicated data address is not permissible 04 failure in associated device Other ...

Страница 50: ......

Страница 51: ...rmany May 2000 Sold by Wirtschafts und Verlagsgesellschaft Gas und Wasser mbH Postfach 140151 D 53056 Bonn Germany Technische Regeln Arbeitsblatt G485 Digitale Schnittstelle für Gasmessgeräte DSfG Technical regulations Code of Practice G485 Digital Interface for Gas Meters DSfG only available in German Order no ISSN 0176 3490 Publisher DVGW Postfach 140362 D 53058 Bonn Germany September 1997 Sold ...

Страница 52: ......

Страница 53: ...Data blocks 9 1 Data exchange module 2 2 Data interface DSS 5 2 Data word 9 1 DSfG Job list 2 2 DSfG bus access 4 5 DSfG Gateway Principle 2 1 DSfG Gateway Tasks 1 2 DSfG module 2 2 DSS 5 2 G Gas quality entity Simulating 2 3 gas net Introduction 1 1 GQ simulation module 2 3 GSM wireless modem Antenna 5 5 GW GNET 4 1 Service programs 4 5 H Host Job list 2 2 Host protocol RK 512 6964R 9 1 I Import ...

Страница 54: ...P Parameterisation 4 1 Creating 4 1 Import 4 3 Pin assignment COM2 5 3 R RDT Null modem 2 9 RK512 3964R protocol 9 1 S Safety and warning notes v Serial process board MSER2 5 2 T TCP IP interface 5 3 Totalizing counter 2 6 W Wireless modem M20 TC35 Connection to 24 V 5 6 ...

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