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Communication Page
Description 4/3
Function overview 4/3
Typical applications 4/5
Integration into substation control systems 4/7
Integration into the SICAM PAS power automation system 4/9
Integration into the substation automation system 4/10
Integration into the SICAM PAS power automation system 4/11
Solution without substation control system 4/12
Function overview
Description
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Description
• Remote communicationwith DIGSI
• Remote communication withSIPROTEC 4 units
• Remote communication withSIPROTEC 3 units andSIPROTEC ‘600 units
Typical applications
• SIPROTEC 4 units on an RS485 bus
• SIPROTEC 4 units with FO/RS485
• Mixed system SIPROTEC 4,SIPROTEC 3 units,SIPROTEC ‘600 units
• Configuration with active star-coupler
Integration into substation control systems
Integration into the SICAM powerautomation system
Integration into other systems
Communication
Communication interfaces on protectionrelays are becoming increasingly importantfor the efficient and economical operationof substations and networks. The interfacescan be used for:
• Accessing the protection relays from a PCusing the DIGSI operating program. Re-mote access via modem, Ethernet modemis possible with a serial service port at therelay. This allows remote access to all dataof the protection relay.
• Integrating the relays into control systemswith IEC 60870-5-103 protocol,PROFIBUS-FMS protocol,PROFIBUS-DP protocol, DNP 3.0 proto-col and MODBUS protocol.The standardized IEC 61850 protocol isavailable since Oct. 2004 and with itsSIPROTEC units Siemens has providedthis standard as the first manufacturerworldwide.
• Peer-to-peer communication of differen-tial relays and distance relays to exchangereal-time protection data via fiber-opticcables, communication network, tele-phone networks or analog pilot wires.
Fig. 4/1
Remote communication with DIGSI
By using the remote communication func-tions of DIGSI it is possible to access relaysfrom your office via the telephone net-work. So you do not have to drive to thesubstation at all and, if you need to carryout a quick fault analysis, for example, youcan transfer the fault data into your officein just a few minutes so that you can useDIGSI to evaluate it.
Another alternative is the ability to accessall the units of a substation from a centralpoint within that station. This saves youhaving to connect your PC individually toall the relays in the station.
In both cases you need a few simple com-munication units and a PC with DIGSI anda remote communication componentinstalled. The data traffic with DIGSI uses asecure protocol based on the IEC stand-ard similar to IEC 60870-5-103 so that,amongst other things, the relays haveunique addresses for accessing purposes.A high level of data integrity is achievedthrough the check sum incorporated in thetelegram. Any telegrams that might be-come distorted during transmission arerepeated. A comparison of parameters be-tween relay and PC to ensure that theymatch also improves the integrity. Thereare other security functions too such aspasswords and a substation modem call-back function which can also be triggeredfrom events.
Remote communication with SIPROTEC 4units
SIPROTEC 4 units are well equipped forremote communication. A separate serialservice interface for the protectionengineer, independent of the system inter-face, allows the units to be easily integratedinto any communication configuration.The front interface then remains free forlocal operation. Together with a flexibilityin the choice of interface, i.e. optical withan ST connector for multi-mode FO cablesor electrical for RS232 or RS485 hard-wired connections, it is easy to create theoptimum solution for any particular appli-cation.
With SIPROTEC 4 units you can also usePROFIBUS-FMS to provide a central linkwith DIGSI via the control system inter-face. For this you will need a PC with aspecial PROFIBUS card that must be con-nected to the PROFIBUS system. This so-lution is intended exclusively forSIPROTEC 4 units with PROFIBUS-FMS.
Since Oct. 2004, a relay can be accessed re-motely with DIGSI via an Ethernet inter-face in the relay and with the IEC 61850protocol. This allows access to the relaysvia an Ethernet network. Some relays in-clude a Web server, so an Internet browsercan also be used for remote access viaEthernet.
Remote communication with SIPROTEC 3and series ‘600 relays
These relays are ideal for applications in-volving remote communication. Whenconfiguring the actual communication sys-tem, however, it is important to take intoaccount the smaller number of relay inter-faces compared with SIPROTEC 4 units.
In the case of SIPROTEC 3 units, commu-nication is normally effected via the systeminterface at the back of the unit. If this in-terface is already being used for communi-cation with the substation control system,the front interface can be used for theDIGSI communication instead. A suitableconnector module is available to convertfrom electrical to optical interface.
Series ‘600 relays normally have one RS485interface which can be used for communi-cation either with the substation controlsystem or with DIGSI.
SIPROTEC series ‘80 relays offer the samefeatures regarding communication possi-bilities as SIPROTEC 4 devices.
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Description
Fig. 4/2 Remote relay communication
An extensive range of communicationcomponents, such as modems, star cou-plers, optoelectric converters, prefabricatedFO connection cables and electric connec-tion cables (see part 12 of this catalog) al-lows you to create a variety of differentsolutions: FO connections immune tointerference or cost-effective solutionsusing the two-wire RS485 electric bus.
The following examples give some indica-tion of what configurations are possible,which items are needed for the purposeand what baud rates are possible.
Example 1: SIPROTEC 4 unitson an RS485 bus
Remote communication is effected via aprivate or public telephone network withboth analog or digital telephone linesbeing possible. An Ethernet network canalso be used together with Ethernet mo-dems. The 8N1 data format and an analogbaud rate of 57.6/64 kbit/s have become es-tablished as the standard for serial modemlinks. The connection between modem andunits is initially optical. An FO/RS485 con-verter 7XV5650 that can be installed closeto the units then converts the signals forthe RS485 bus. Up to 31 relays can be con-nected to the RS485 bus. Particularly in thecase of modems, we recommend the use ofthe types of units listed in part 12. Otheraccessories can be found in the same part(see Fig. 4/3).
Example 2: SIPROTEC 4 units with FO/RS485
In the case of larger substations with longerdistances we recommend the use of FOconnection cables. The following exampleshows a mixed system of optical and elec-trical connections. Typically, all relays in acubicle can be linked together via RS485and the cubicles themselves can be con-nected to the star coupler via FO cables(see Fig. 4/4).
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Fig. 4/3 SIPROTEC 4 units on an RS485 bus (Example 1)
Fig. 4/4 Two groups of SIPROTEC 4 units on an RS485 bus (Example 2)
Typical applications
Example 3: Mixed system – SIPROTEC 4,SIPROTEC 3, series ‘600
Relays from different families can be inte-grated into a remote communication sys-tem, as illustrated in Example 3 (seeFig. 4/5). This example also shows howrelays can be integrated by means of FOlinks and star couplers. With this kind ofarrangement the baud rate for all linksmust be set at 19.2 kbaud because theSIPROTEC 3 units and the series ‘600relays cannot support a higher baud rate.In this case we recommend to use the7XV5550 active mini star-coupler (seeFig. 4/6).Communication will then generally be at57.6/64 kbit/s on the modem link. For anyunits that cannot operate at this baud ratethe active star-coupler will convert the rateaccordingly.
Example 4: Configuration with active star-coupler
With this configuration it is also possibleto integrate relays that can only beconnected via the front interface andwhose maximum baud rates are lessthan 19.2 kbaud (see Fig. 4/6).
The following points must be noted withthis type of configuration:
• One output of the active mini star-coupler is used to service severalSIPROTEC 4 units through further starcouplers or RS485 converters. On thatoutput, a mixed system containingSIPROTEC 3 and series ‘600 relays shouldbe avoided so that 57600 baud operationis possible for SIPROTEC 4 relays.
• Several SIPROTEC 3 units and series ‘600relays can also be connected to anotheroutput of the active mini star-coupler (viamini star-couplers or RS485 converters).The baud rate for this output must be setless or equal to 19200 baud.
• Relays that are not available with commu-nication functions according toIEC 60870-5-103 protocol (e.g. 7VE51,7VK51, 7SV51 and older firmware ver-sions of some relays) can also be con-nected via the active star-coupler asillustrated in Fig. 4/6. In this case one out-put must be assigned to each relay. Thebaud rate must be set according to theunit.
The solutions for central and/or remotecommunication with SIPROTEC unitshave easy upgrade compatibility. Differentversions of relays can be integrated into aremote communication concept. This issupported by the substation and devicemanagement in the DIGSI software. Asubstation can be retrofitted with add-onremote communication componentsprovided it has the communication con-nection available. And changing of the tele-phone line from, say, analog to digital doesnot necessitate the replacement of all com-ponents. Also, Ethernet networks can beused. The telephone modem is then re-placed by an Ethernet modem. The infra-structure in the substation remainsunchanged.
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Typical applications
Fig. 4/5 Mixed system, FO/RS485 with units from different families (Example 3)
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Typical applications
Fig. 4/6 Mixed system with relays from different families, with active star-coupler (Example 4)
Integration into substation control systems
Relay type Substation control telegram
IEC 61850 IEC 60870-5-103 PROFIBUS-DP MODBUS DNP 3.0
6MD61 V4.0 V4.0 V4.0
6MD63 V4.6 V4.0 V4.2 V4.2 V4.2
6MD663/4 V4.6 V4.2 V4.2
7SA522 V4.6 V4.0 V4.2 V4.2
7SA6.. V4.6 V4.0 V4.2 V4.2
7SD52. V4.6 V4.0 V4.21 V4.21
7SD61 V4.6 V4.0 V4.2 V4.2
7SJ600 V1.0
7SJ602 V1.0 / V3.5 V3.5 V3.5
7SJ61/62/63 V4.6 V4.0 V4.2 V4.2 V4.2
7SJ64 V4.6 V4.0 V4.4 V4.4 V4.4
7S*80 V4.0 V4.0 V4.0 V4.0 V4.0
7UM61 V4.0 V4.0 V4.1 V4.1
7UM62 V4.6 V4.0 V4.0 V4.0 V4.1
7UT6. V4.61) V4.0 V4.0 V4.0 V4.0
7VE6 V4.6 V4.0 V4.0 V4.0 V4.0
7VK61 V4.6 V4.0 V4.0 V4.0
Almost all SIPROTEC units can be inte-grated into substation control systems viacommunication interfaces.
The relays can be supplied as part of an in-tegrated Siemens system offering all substa-tion control and protection. In addition,the relays can also be integrated into othercontrol systems via standard protocols. Anintegrated system offers type-tested func-tions, consistent configuration and opti-mally coordinated communicationprotocols. SICAM PAS and SICAM 1703are two proven systems available fromSiemens. These systems, also offer Ethernetcommunication with IEC 61850.
For situations where you would like tointegrate SIPROTEC units into othercontrol systems we can offer open com-munication interfaces. In addition to theIEC 60870-5-103 protocol that is availablein almost all relays we can also offer othercommunication protocols for SIPROTEC 4units like PROFIBUS-DP, MODBUS orDNP 3.0. IEC 61850 is availablesince Oct. 2004.
1) Not 7UT612
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Integration into substation control systems
Substation control port B Port C
IEC 61850 IEC 60870-5-103 PROFIBUS-DP MODBUS DNP 3.0 DIGSI
Alarms(relay � central unit)
F withtime stamp
F withtime stamp
F withtime stamp
F withtime stamp
F withtime stamp
F withtime stamp
Commands(BC/central unit � relay)
F F F F F F
Measured values F F F F F F
Timesynchronization
F F F F F 1)
Fault records(sampled values)
F F Separate port(with DIGSI)2)
Separate port(with DIGSI)2)
Separate port(with DIGSI)2)
Protection settings F(with DIGSI)
Separate port(with DIGSI)3)
Separate port(with DIGSI)3)
Separate port(with DIGSI)3)
Separate port(with DIGSI)3)
F
Parameter groupswitchover
F F F F F F
1) There is no time synchronization via this proto-col. For time synchronization purposes it is pos-sible to use a separate time synchronizationinterface (Port A in SIPROTEC 4 relays).
2) The transmission of fault records is not part ofthe protocol. They can be read out with DIGSIvia the service interface Port C or the front oper-ating interface.
3) This protocol does not support the transmissionof protection settings. Only setting groups canbe changed. For this purpose you should use theservice interface or the front operating interfacetogether with DIGSI.
The table on page 4/7 shows which com-munication protocols are available in thevarious SIPROTEC relays starting with thefirmware version. The latest version can befound on the Internet atwww. siprotec.com.
IEC 61850 protocol
Since Oct. 2004, the Ethernet-basedIEC 61850 protocol is the worldwidestandard for protection and control sys-tems used by power supply corporations,Siemens was the first manufacturer tosupport the protocol in its devices. Bymeans of this protocol, information canalso be exchanged directly between bayunits so as to enable the creation of simplemasterless systems for bay and system in-terlocking. Access to the units via theEthernet bus is also possible with DIGSI.
It will also be possible to retrieve operatingand fault messages and fault recordings viaa browser. This Web monitor will alsoprovide a few items of unit specific infor-mation in browser windows.
IEC 60870-5-103 protocol
The IEC 60870-5-103 protocol is an inter-national standard for the transmission ofprotective data and fault recordings. Allmessages from the unit (and also controlcommands) can be transferred via pub-lished, Siemens-specific extensions.
PROFIBUS-DP protocol
PROFIBUS-DP is the most widespreadprotocol in industrial automation. ViaPROFIBUS-DP, SIPROTEC units maketheir information available to a SIMATICcontroller or, in the control direction, re-ceive commands from a central SIMATIC.Measured values can also be transferred.The information is assignable to a map-ping file with DIGSI.
MODBUS RTU protocol
This uncomplicated, serial protocol ismainly used in industry and by power sup-ply corporations, and is supported by anumber of unit vendors. SIPROTEC unitsbehave as MODBUS slaves, making theirinformation available to a master or re-ceiving information from it. Informationis assignable to a mapping file with DIGSI.
DNP 3.0 protocol
Power supply corporations overseas usethe serial DNP 3.0 (Distributed NetworkProtocol) for the station and network con-trol levels, SIPROTEC units behave asDNP slaves, supplying their information toa master system or receiving informationfrom it. Information is assignable to amapping file with DIGSI.
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Integration into the SICAM power automation system
SIPROTEC 4 is tailor-made for use withthe SIMATIC-based SICAM power auto-mation system. The SICAM family com-prises the following components:
• SICAM 1703, the modern telecontrol sys-tem with automation and programmablelogic functions
• SICAM PAS, the substation automationsystem based on dedicated hardware
Data management and communication isone of the strong points of the SICAM /SIPROTEC 4 system. Powerful engineeringtools make working with SICAM conve-nient and easy. SIPROTEC 4 units are opti-mally matched for use in SICAM PAS. WithSICAM and SIPROTEC 4 continuity existsat three crucial points:
• Data management
• Software architecture
• Communication
The ability to link SICAM/ SIPROTEC toother substation control, protection andautomation components is assured, thanksto open interfaces such as IEC 60870-5-103protocol and the Ethernet-based IEC61850 protocol. Other protocols likePROFIBUS-DP, DNP 3.0 and MODBUSare also supported.
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Integration into substation automation system
SIPROTEC 4 is tailor-made for use withthe SICAM substation automation system.Over the low-cost electrical RS485 bus,the units exchange information withthe control system. Units featuringIEC 60870-5-103 interfaces can be con-nected to SICAM interference free andradially by fiber-optic link. Through thisinterface, the system is open for the con-nection of units of other manufacturers.
Fig. 4/7 Communication structure with substation automation system
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SIPROTEC 4 is tailor-made for use withthe SICAM power automation system to-gether with IEC 61850 protocol. Via the100 Mbit/s Ethernet bus, the units arelinked electrically or optically to the stationPC with PAS. Connection may be simpleor redundant. The interface is standard-ized, thus also enabling direct connectionof units of other manufacturers to theEthernet bus. Units featuring anIEC 60870-5-103 interface or other serialprotocols are connected via the Ethernetstation bus to SICAM PAS by means ofserial/Ethernet converters (see Fig. 4/8).DIGSI and the Web monitor can also beused over the same station bus.
Together with Ethernet/IEC 61850, an in-terference-free optical solution is also pro-vided (see Fig. 4/9). The Ethernet interfacein the relay includes an Ethernet switch.Thus, the installation of expensive externalEthernet switches can be avoided. The re-lays are linked in an optical ring structure.
Integrated SNMP (Simple NetworkManagement Protocol) facility allows thesupervision of the network from the sta-tion controller.
Integration into the SICAM PAS power automation system
Fig. 4/8 Ethernet-based system with SICAM PASwith electrical Ethernet interface
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Thanks to the standardized interfaces,IEC 61850, IEC 60870-5-103, DNP3.0,MODBUS, PROFIBUS-DP, SIPROTEC unitscan also be integrated into non-Siemens sys-tems or in SIMATIC S5/S7. Electrical RS485or optical interfaces are available. The opti-mum physical data transfer medium can bechosen thanks to opto-electrical converters.Thus, the RS485 bus allows low-cost wiringin the cubicles and an interference-free opti-cal connection to the master can be estab-lished.
Integration into a substation automation system of other makes
Fig. 4/9 Ethernet-based system with SICAM PASwith optical Ethernet interface
Solution without substation control system
Fig. 4/10 Ethernet-based system with optical Ethernet interfaceand migration of relays with serial protocol
Ethernet-based communication with opti-cal Ethernet interface between SIPROTECprotection relays without substation con-trol offers many advantages:
• Fast remote access via DIGSI 4
• High-speed setting and parameterizationwith DIGSI 4
• Interlocking between different field de-vices and exchange of binary signals viaGOOSE messages of IEC 61850
• Common time synchronization of all re-lays from central time synchronizationserver (eg. SICLOCK)
For automation of new substations (orplants) and modernization of existingsubstations you get future investment se-curity, without additional investment.
