EP1198736A1 - Method for configuring a field bus node - Google Patents

Method for configuring a field bus node

Info

Publication number
EP1198736A1
EP1198736A1 EP20000947953 EP00947953A EP1198736A1 EP 1198736 A1 EP1198736 A1 EP 1198736A1 EP 20000947953 EP20000947953 EP 20000947953 EP 00947953 A EP00947953 A EP 00947953A EP 1198736 A1 EP1198736 A1 EP 1198736A1
Authority
EP
European Patent Office
Prior art keywords
bus
address
characterized
node
logical address
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20000947953
Other languages
German (de)
French (fr)
Inventor
Andreas Heckel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pilz GmbH and Co
Original Assignee
Pilz GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE19934514 priority Critical
Priority to DE1999134514 priority patent/DE19934514C5/en
Application filed by Pilz GmbH and Co filed Critical Pilz GmbH and Co
Priority to PCT/EP2000/006485 priority patent/WO2001007974A1/en
Publication of EP1198736A1 publication Critical patent/EP1198736A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements or network protocols for addressing or naming
    • H04L61/20Address allocation
    • H04L61/2038Address allocation for local use, e.g. on local area networks [LAN] or on universal serial bus [USB] networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/40Bus networks
    • H04L12/40006Architecture of a communication node
    • H04L12/40019Details regarding a bus master
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/40Bus networks
    • H04L12/40169Flexible bus arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/12Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00 characterised by the data terminal
    • H04L29/12009Arrangements for addressing and naming in data networks
    • H04L29/12018Mapping of addresses of different types; address resolution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/12Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00 characterised by the data terminal
    • H04L29/12009Arrangements for addressing and naming in data networks
    • H04L29/12207Address allocation
    • H04L29/12254Address allocation for local use, e.g. on Local Area Networks [LAN] or on Universal Serial Bus [USB] networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/12Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00 characterised by the data terminal
    • H04L29/12009Arrangements for addressing and naming in data networks
    • H04L29/12792Details
    • H04L29/12801Details about the structures and formats of addresses
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/12Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00 characterised by the data terminal
    • H04L29/12009Arrangements for addressing and naming in data networks
    • H04L29/12792Details
    • H04L29/1283Details about address types
    • H04L29/12839Layer 2 addresses, e.g. Medium Access Control [MAC] addresses
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements or network protocols for addressing or naming
    • H04L61/10Mapping of addresses of different types; Address resolution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements or network protocols for addressing or naming
    • H04L61/60Details
    • H04L61/6004Structures or formats of addresses
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements or network protocols for addressing or naming
    • H04L61/60Details
    • H04L61/6018Address types
    • H04L61/6022Layer 2 addresses, e.g. medium access control [MAC] addresses
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/40Bus networks
    • H04L2012/40208Bus networks characterized by the use of a particular bus standard
    • H04L2012/40221Profibus
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S370/00Multiplex communications
    • Y10S370/908Local area network
    • Y10S370/909Token ring

Abstract

The invention relates to a method for configuring a node (16, 18, 19) connected to a field bus (10), according to which a logical address (44) is allocated to the node (18). According to the invention, said method comprises transmitting the logical address (44) of an address-allocating unit (28) to the node (18); transmitting the physical address (42) of the address-allocating unit (28) to the node (18) whereby the physical address (42) corresponds to a physical position of said node (18) in relation to the bus field (10); checking the physical address (42) transmitted to the node (18), on the basis of an actual physical position of the node (18) in relation to the field bus (10); and storing the transmitted logical address (44) in a memory of the node (18) according to the result of the verification step relating to the physical address (42). The invention also relates to a node (18) in which the inventive method can be implemented.

Description

METHOD FOR CONFIGURING A FIELD BUS OPERATOR

The present invention relates to a method for configuring a bus subscriber connected to a fieldbus, wherein the bus node is assigned a logical address.

The invention further relates to a bus user for connection to a field bus, means for receiving and evaluating a bus telegram and with a memory for storing a logical address assigned to the bus. A method of the aforementioned type and a corresponding bus devices are known because of their use in practice used fieldbuses.

A fieldbus is a communication system which is used in particular in industrial automation technology to connect spatially distributed sensors and actuators with master controllers and computers. Characteristic of a fieldbus is that the individual connected to the field units are connected via a manifold, which at least in principle allowing arbitrary units via fieldbus can communicate with each other without being wired together individually. The units are connected to the field below generally referred to as a bus subscriber.

The actual data transmission occurs at a fieldbus based on established rules, called protocols. With respect to these protocols are two basic types of field buses can be distinguished, on the one hand so-called field buses with a message-oriented transmission methods and field bus on the other hand th with a so called I / O orienting transmission method. In the former transfer process each bus is assigned a unique address. For data transfer from one bus to another, the sending bus user completes the data telegram with the message to be transmitted to the selected protocol in accordance with the address of the receiving bus subscriber. Then, the provided with the address data telegram is sent via the bus and the receiving bus user can recognize that the message is intended for it based its associated address. It is understood that in these message-oriented transmission method each bus user must know the address assigned to it. The assignment of the address to the bus device is usually carried out with the help of DIP switches that each bus must have and where assigned to the bus subscriber address is set. An example of a bus with a message-oriented transmission method is the so-called CAN bus.

In contrast, there is no need for an I / O-oriented transmission procedure itself, assign the individual bus an individual address. The communication between the bus stations is carried out here rather by the fact that only a parent bus subscriber, the so-called bus master is able to initiate a data traffic. The bus master is accurately known, the structure of the bus, and in particular the order of the bus devices connected to the bus. The bus master sends a precisely specified data frame having as many data fields, such as bus subscribers are connected to the fieldbus. The data fields of the data frame is forwarded to all round from a bus station to the next and finally back to the bus master. As soon as the bus master is seen that the start word of the data frame is initiated by him once completely circulated in the ring structure of the bus subscribers, it generates a signal that all bus devices associates the message at the time of the signal contained in them. The distribution of the data to be sent to the individual bus takes place here so the mere fact that the bus master "filled" due to the known him bus structure the data fields of the data frame initiated by him suitable. An example of egg NEN fieldbus with such a transmission method is the so-called Interbus.

A more detailed description of the Interbus found for example in the book "Interbus - Principles and Practice" by Baginski et. al., published in Hüthig-Verlag, 1998. In this book, the fact that no individual addresses are required for the Interbus is found to be particularly advantageous because as a result, eliminates the need to equip the individual network devices with DIP switches or the like.

In safety-critical processes, such as the monitoring of emergency off switch of a hydraulic press, does not have a field bus systems were used in the past, since due to their open-access structure an ideally 100% fail-safety could not be guaranteed. Only in recent years has tried to use serving by additional security measures such as particular additional error security protocols, fieldbus systems for safety-critical applications. These safety protocols are also at an Interbus at least the bus stations, which are involved in safety-critical processes, assigned addresses may check with the help of bus devices, whether a message transmitted to him is actually intended for him. Errors could, for example, arise if a change in the order or in the type of active devices connected to the Interbus bus users, which is not known to the bus master quickly enough. This can happen, for example, by an oversight in the exchange of a bus station. To implement a fail-safe Interbus it is therefore necessary to allocate at least the failsafe bus devices in a failsafe way addresses. For this purpose, the bus users are previously provided with a coding switch, is assigned by the appropriate adjustment of the bus subscriber the individual address. This address will be referred to as a logical address because it fundamentally from the physical structure of the field bus, ie in particular the order of the connected bus stations, can be independent.

However, the use of DIP switches for mapping logical addresses has drawbacks. A disadvantage is that always require coding mechanically adjustable elements in any form. However, mechanical components are comparatively complicated and thus expensive to manufacture in mass production in comparison with purely electronic components. In addition, mechanical components generally are subject to wear, which prevents especially in safety-critical applications to use simple components. Another disadvantage of the use of DIP switches that these must be arranged in each case in the region of each bus subscriber. For complex process control systems in the industrial sector, however, the individual connected to the field can be separated up to several hundred meters, bus nodes. Since when using DIP switches in this case, the allocation of the logical address is at the site of the bus station, large walkways are required under circumstances that make setting up and configuring consuming and cumbersome. Finally, it is in remote configuration measures in such stretches easily possible to lose track of which can lead to errors in the address assignment especially when replacing a defective bus subscriber.

It is therefore an object of the present invention to provide a method of the type mentioned, which can be associated with a bus device in a failsafe manner, a logical address, without mechanically operable coding switches are required. It is further object of the invention to provide a bus device of the type mentioned, which is configurable by the method according to the invention.

This object is achieved by a method of the type mentioned, comprising the steps of:

Transmitting the logical address of a Adreßvergabe- unit to the bus node,

Transmitting a physical address of the automatic address output unit to the bus subscribers, wherein the physical address corresponding to an assumed relative physical position of the bus station to the field bus,

Verify the documents before the bus user physical address based on an actual physical location of the bus station in relation to the fieldbus, and

Storing the transmitted logical address in a memory of the bus node, depending on the verification of the physical address. The problem is solved further by a bus device of the type mentioned, having means for verifying a transmitted him physical address, wherein said means act on the memory for storing the logical address.

In the inventive method, the logical address is transmitted to the bus user as a data value. This can be done via a connected specially for this purpose on the bus subscriber communication link. However, it is also possible is carried out in more detail below, to send the bus users the logical address as data via the fieldbus itself. In any case, thus the need to use mechanically adjustable coding unnecessary. The logical address rather can be defined in a simple and known manner by software in the Adreßvergabeeinheit. The Adreßvergabeeinheit includes the simplest case, a commercially available computer, which can be accessed on the bus participants via a suitable software. For the Interbus such software, for example, the so-called CMD tool (Configuration Management Diagnosis) of Phoenix acquatic GmbH & Co. in Blomberg, Germany. However, the Adreßvergabeeinheit purposes of the present invention may in addition to the standard computer also include an adapter unit, with which the computer-defined logical address is converted into a transmittable via the fieldbus data word. The Interbus CMD tool, for example, connected to the bus master via a V.24 interface so that the Adreßvergabeeinheit any one includes in this case, in addition to said computer and the bus master and its related control unit. With a direct connection such as a regular computer to a bus devices, the bus master is not necessarily included in the Adreßvergabeeinheit.

Due to the fact that a physical address is transmitted to the bus user in addition to the logical address related to the actual physical position of the bus device to the fieldbus corresponds to (for example, position "2" in the field bus), is an incorrect assignment of the logical address (holds the example, the position "3") to an incorrect bus users excluded. In this way the fault safety is achieved for safety-critical processes.

Storing the transmitted logical address in response to the verification of the physical address may for example be in a so-called EEPROM, among which an electronically rewritable nonvolatile memory is to be understood. According to the inventive method, the bus subscriber according to the invention thus has such a memory which can be written in response to a verification result.

The measures mentioned have the advantage of being able to dispense with the use of mechanical coding. This eliminates the disadvantages described at the outset, involved. The bus subscriber invention can be produced cost-effectively, therefore, to accept without sacrificing terms of fault tolerance.

The stated object is thus completely achieved. In a particularly preferred embodiment of the method, the logical and the physical address are sent to the bus users via the fieldbus.

This measure has the advantage that the configuration of the bus subscriber can be performed from a central location, even if the corresponding bus device is remotely located spatially far from the central office, which is often the case in particular with field busses in the industrial field. Therefore, pursuant to the said measure, the configuration of the bus user much easier. Moreover, no additional wiring of the bus station is needed for carrying out the process. This also contributes to simplify the configuration. The transfer of the two addresses given via the fieldbus can be included in a special configuration mode is basically both message-oriented as well as in I / O-oriented bus systems. However, it is particularly easy to implement in the latter bus systems, as these need to transfer data no addresses have already been defined. To this extent the measure referred to is particularly advantageous in buses with the I / O-oriented transmission methods.

In a further preferred embodiment of the method according to the invention, the logical address and the physical address are transmitted to the bus users in a common data telegram.

This measure has the advantage that due to the nearly simultaneously transfer the error security is further increased. lead a known Prüfverf when used to ensure the verification of a data message is thus possible that a corrupted logical address is transferred to the bus device in combination with a correct physical address without the bus users can determine this. Furthermore, thereby excluded that changes be made to the bus system between the transmission of the logical address and the transfer of the physical address, which in turn can have an impact in an incorrect assignment of addresses.

In a further preferred embodiment of the method of the bus subscriber determines its actual physical position based on the field bus by means of a position determining unit to date. A corresponding bus device is characterized in that said means include a position determining unit for determining an actual physical position of the bus device based on the field bus.

This measure has the advantage that the error protection is improved in the assignment of an address once again by a current determination of the physical position of the bus device. it would be possible alternatively, the bus users the time allotted for him physical position relative to the field bus in a different way to communicate. However, a current determination means of a position determining unit ensures that even unwanted changes in the structure of the field bus are determined so that errors in the assignment of addresses are recognized unambiguously.

In another embodiment of the aforementioned measures, the fieldbus has a circulating telegram traffic and the bus device determines its actual physical position by counting of cyclic events of circulating telegram traffic. Accordingly, the position detecting unit of the bus device includes in this embodiment a counter for count of cyclic events of circulating telegram traffic.

The described feature provides the advantage that the determination of the actual physical position in this way is very simple and yet reliably. The reason is that the individual data packets are successively passed by a bus device after the next in a circulating telegram traffic. This has the consequence that in this case, the waiting time which elapses until a bus device receives the start word of the message traffic, corresponding to its position in the order of bus devices. The waiting time can be technically very simply by counting the cyclical events cause. As cyclic events in particular clock pulses come here in question with which the traffic is synchronized to the fieldbus.

In a further embodiment of the aforementioned measure the field bus is an Interbus and the bus subscribers is one cyclic events during a so-called ID-cycle of the Inter- bus until a start word of the circulating telegram traffic reaches him.

This measure has the advantage that the so-called ID-cycle at an Interbus is precisely defined and can be also initiated by each bus at any time by an error message. The described is thus particularly advantageous in a Interbus, since the determination of the actual loan position of the bus station with the exception of a counter in the bus user requires no expensive hardware or software measures. In addition, the measure referred moved completely within the approved for Interbus specifications, so that individual, selected bus subscribers can be assigned on the basis of the invention, an address, without interfering with the operation of the entire bus traffic and without interfering with the basic specifications of the inter-bus ,

In a further advantageous embodiment of the aforementioned measures of bus devices used for position determination of an ID-cycle which is initiated by another bus, particularly a bus master.

This measure has the advantage that the bus subscriber can determine its actual physical location without even to influence events on Interbus. The verification can be carried out, therefore, without the other connected to the bus participants are affected. It is particularly advantageous if the bus device determines its position during each occurring ID cycle, as changes on the bus can be quickly realized in this way is. By default, is an ID-cycle instead of at least after the commissioning of the bus.

In a further advantageous embodiment of the bus devices used for positioning an ID cycle he triggers after receiving the physical address itself.

This measure has the advantage that the bus subscriber can verify the physical address obtained immediately after reception, whereby errors are avoided due to a temporary change in the bus structure. Thus, the described feature provides the advantage that the error protection is improved.

In another mode of the invention, the physical address is selected as the logical address.

This measure has the advantage that for performing the method according to the invention only a single data value must be transmitted to the bus users can verify the basis of its actual physical location and then he can use as logical address. The data width of the bus station can be selected accordingly small.

In an alternative embodiment of the aforementioned measure, the logical address is selected independently of the physical address.

This measure has the advantage that the logical address can be selected according to user-defined criteria, so that overall a much greater range of variation is available. Furthermore, there is no need to assign addresses within the fieldbus system again if new bus devices are connected to the fieldbus or be separated from it by virtue of such measure.

It is understood that the features mentioned above and useful features to be explained not only in the respectively specified combination but also in other combinations or even alone, without departing from the scope of the present invention. In particular, the invention is not limited to use with I / O-oriented field buses, but can be used for all bus, where an address is to be assigned.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:

Fig. 1 shows a field bus system in which the inventive method is carried out for configuring a bus node and

Fig. 2 is a schematic representation of a bus device according to the invention on the example of the inter-bus.

In FIG. 1, a bus with bus users connected to it in its entirety is designated by reference numeral 10. The field bus 10 is an Interbus here.

are exemplary of a control unit 12 having a bus master device 14 and three bus subscribers 16, 18 and 19 connected to the Interbus 10th Moreover, here, the control unit 12 includes means, not shown, with which they can monitor and control processes. For this purpose, the control unit 12 receives data from the bus nodes 16, 18, 19, which are in turn connected to sensors and actuators not shown here. Such a system is known per se and therefore not shown here in more detail. As an alternative to this embodiment, the bus master can block 14, however, also be connected separately from the fail-safe control unit 12 to the Interbus 10th

The bus master module 14 is in this case a so-called USC / 4, which has been widely used in the field of Interbus applications. The bus master module 14 is connected via an annular hinlaufende data line 20 and a returning data line 22 with the bus subscribers 16, 18, 19th In this case, the data on the data lines 22, each passed 22 from a bus user to the next.

It is assumed in the present embodiment, the control unit 12 serves, inter alia, for controlling safety-critical processes, such as the monitoring of an emergency stop switch. A monitor signal of the emergency stop switch (not shown) the bus subscriber 18 is accordingly supplied. Since it is in this process to a safety-critical process, both the controller 12 and the bus nodes 18 with safety-antigenic means 24, provided 26 with which it is possible, using the non-fail-safe per se Interbus a fail-safe data communication allow. Such safety-related devices 24, 26 are known in the monitoring and control safety-critical processes and include, for example, diverse, redundant systems which check each other in the processing of data.

The reference numeral 28 is a standard personal computer is designated, which is connected via a data line 30 to the control unit 12th The connection is implemented here using a standard V.24 interface. With the computer 28 via a known Interbus-management software (eg CMD tool of Phoenix), a data telegram 32 is produced, the content here essentially involves instruction in the process of the invention, the node with the physical address "2", the assign logical address "xy". The physical address "2" corresponds with the position of the addressed bus subscriber within the ring structure of the inter-bus 10. In the present case this is the bus subscriber 18, which results when the devices connected to the interbus 10 units starting from the control unit 12 from zero by one.

The reference numeral 34 a data message is designated, which is transmitted from the bus master module 14 in the direction of arrow 36 through the data line 20 to the bus nodes sixteenth The data message 34 is part of a signal generated by the bus master module 14 data frame includes all circulating at a time in the Interbus 10 data telegrams.

The reference numeral 38 a further data telegram is designated, which is transmitted by the bus subscriber 16 to the bus subscriber 18 in the direction of arrow 40th The data telegram 38 transported thereby a physical address 42, and a logical address 44, transmitted to the method according to the invention accordingly from the computer 28 via the safety-related device 24 for bus subscribers 18th

The circulating in the Interbus 10 data frame further includes data frames 46, which are transmitted in the direction of arrows 40, 48 in the Interbus 10 circumferentially. Another belonging to said data frame data telegram is designated by the reference numeral 50th The data message 50 includes a fixed definition for the Interbus start word, commonly referred to as the "Loop Back Word" (LBW). The data message 50 is transmitted in the position shown in Fig. 1 with in the direction of arrow 52 from the bus subscribers 16 back to the bus master package 14.

It is known that 14 generates the bus master module a signal as soon as it receives back the originally generated by it data message 50 to the start word. This is the sign that the entire data frame is once circulated fully Interbus 10 for him. On the basis of the generated signal (not shown here) recognize the devices connected to the bus subscriber 10 Interbus 16, 18, 19, that the last received each data message is intended for them. Thus, the bus subscriber 18 is in this case, the message with the physical address 42 and the logical address 44th

In FIG. 2, the bus node 18 with its essential components the invention is shown schematically.

The bus subscriber 18 has a known protocol chip 60, which realizes the actual connection to the Interbus 10 in the present embodiment. The protocol chip 60 is a standard module, which is well known for the realization of Interbus applications. He realized largely independently what is necessary for data communication protocol in accordance with the specifications for the Interbus and is therefore connected to the data lines 20, 22 in a conventional manner. The protocol chip 60 has essentially a shift register by which the individual data messages are long pushed therethrough until the bus master module 14 receives back the data message 50 to the start word. The data contained in this moment, in the shift register are provided due to the structure of the inter-bus 10 for the bus 18th

The reference numeral 62 is a position determining unit is designated based its actual physical location with the help of bus devices 18 may determine the Interbus 10th refer to the position determining unit 62 has a counter 64 which is controlled by a logic unit 66th The logic unit 66 in turn, receives clock pulses 68 which are generated from the default protocol chip 60 and used to synchronize the data traffic in the Interbus 10th Further receives the logic unit 66, the signals at the output of the ToExRl protocol chip 60, to detect when the data message has arrived 50 with the start word LBW in the protocol chip 60th

By the reference numerals 70, 72 and 74 are designated memory in which the currently determined physical location of the bus subscriber 18, the received logical address 44 and the received physical address can be stored 42nd

The reference numeral 76 finally, a comparison unit is designated with the bus subscribers 18, the received physical address 42 with the currently determined position of the memory 70 can be compared. According to the invention, the received logical address is only stored in the memory 44 determines 72 if the physical address 42 in the memory 74, and the currently determined position of the bus subscriber 18 from the memory 70 match. To carry out the inventive method, the logical address is selected 44 for the bus subscriber 18 in the computer 28 by the management software. As a logical address 44 while the physical address 42 of the bus station can be selected 18th In the present embodiment, however, the logical address is 44 chosen, independently of the physical address 42, which is indicated in Fig. 1 by the letter combination "xy". The allocation of the logical address "xy" for the bus 18 is then transferred via the data line 30 to the control unit 12th The bus master module 14 embeds the logical address 44 and the physical address 42 in the data telegram 38 and initiates the peripheral bus traffic of the Inter 10. In this way, the two addresses 42, 44 to the bus node 18 are transmitted. This verified the physical address 42 then by the following procedure, and optionally stores the logical address 44 and the address assigned to it from.

In order to determine its actual physical position of the bus subscribers 18 forces here after receipt of the data message 38 has a so-called ID-cycle, which triggers a precisely defined sequence. In this procedure, the bus master module 14 generates a data frame, a data telegram with a width of 16 bits is provided in the prior art for each bus 16, 18, 19th The data frame begins here, as usual, with the start word LBW. is the transfer method of the inter-bus 10 corresponding to the start word LBW of a bus subscriber 16, 18, 19 passed to the next. Due to the pre-defined data width of 16 bits per subsequent data telegram is the number of clock pulses 68 that pass up to the time at which the bus node 18 receives the start word LBW, a measure of how many bus users 16 between the bus master module 14 and the bus device 18 are connected to the Interbus 10th The logic unit 66 in the bus subscriber 18 counts this case only those clock pulses 68 that are required to transmit the 16-bit wide data telegrams. Upon receiving the start word LBW in the bus subscriber 18 thus satisfies a division by 16 to 18 based on the Interbus 10 to determine the position of the bus subscriber currently. This position is then stored in memory 70 and compared with the received physical address 42 in the memory 74th

Alternatively or additionally, the bus subscriber can use any other ID cycle 18 to determine its actual position which is triggered in the Interbus. For example, in particular the bus master module 14 initiates an ID-cycle after each time the Inter bus 10th Also be carried out ID cycles when another bus subscriber 16, 19 reports an error.

Claims

claims
1. A method for configuring a to a field bus (10) connected to the bus subscriber (18), wherein the bus device (18), a logical address (44) is assigned, characterized by the steps of:
Transmitting the logical address (44) from a Adreßvergabeeinheit (28) to the bus subscriber (18),
Transmitting a physical address (42) from the Adreßvergabeeinheit (28) to the bus subscriber (18), wherein the physical address (42) with an assumed physical position of the bus node (18) based on the field bus (10) corresponds,
Verifying the bus subscriber (18) transmitted physical address (42) based on the basis of an actual physical position of the bus node (18) to the fieldbus (10) and
Storing the transmitted logical address (44) in a memory (72) of the bus node (18) in response to the verification of the physical address (42).
2. The method according to claim 1, characterized in that the logic (42) and the physical address (44) the bus subscriber (18) via the fieldbus (10) to be transmitted.
3. The method according to claim 1 or 2, characterized in that the logical address (42) and the physical address (44) the bus subscriber (18) are transmitted in a common data telegram (38).
4. The method according to any one of claims 1 to 3, characterized in that the bus node (18) based its actual physical position currently determined on the field bus (10) by means of a position determining unit (62).
5. The method according to claim 4, characterized in that the fieldbus (10) comprises a circulating telegram traffic (34, 38, 46) and in that the bus subscribers (18), its actual physical location by counting of cyclic events (68) of the circulating telegram traffic ( 34, 38, 46) is determined.
6. A method according to claim 5, characterized in that the fieldbus (10) is an Interbus, and that the bus node (18) cyclic events (68) during an ID-cycle of the Interbus long as counts until a start word (50) of the circulating telegram traffic (34, 38, 46) reaches it.
7. A method according to claim 6, characterized in that the bus node (18) uses a ID-cycle for determining the position, which is of another bus subscriber (14, 16, 19), in particular a bus master (14) initiated.
8. The method according to claim 6 or 7, characterized in that the bus node (18) uses a ID-cycle for determining the position, he triggers after receipt of the physical address (42) itself.
9. A method according to any one of claims 1 to 8, characterized in that the physical address (42) is selected as a logical address (44).
10. A method according to any one of claims 1 to 8, characterized in that the logical address (44) is selected independently of the physical address (42).
11. bus user for connection to a field bus (10), means (60) for receiving and evaluating a bus telegram (34, 38, 46) as well as with a memory (72) for storing a the bus subscriber (18) associated with the logical address (44 ), characterized in that the bus node (18) means (62, 64, 66) for verifying a transmitted him physical address (42) and that said means (62, 64, 66) to the memory (72) for storing act of the logical address (44).
12, bus device according to claim 11, characterized in that said means (62, 64, 66) include a position determining unit (62) for determining an actual physical position of the bus node (18) based on the field bus (10).
13, bus device according to 12, characterized in that the fieldbus (10) comprises a circulating telegram traffic (34, 38, 46) and in that the position determining unit (62) comprises a counter (64) for count of cyclic events (68) of the circulating telegram traffic ( 34, 38, 46).
EP20000947953 1999-07-22 2000-07-07 Method for configuring a field bus node Withdrawn EP1198736A1 (en)

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DE19934514 1999-07-22
DE1999134514 DE19934514C5 (en) 1999-07-22 1999-07-22 Method for configuring a bus device connected to a fieldbus
PCT/EP2000/006485 WO2001007974A1 (en) 1999-07-22 2000-07-07 Method for configuring a field bus node

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US20020138668A1 (en) 2002-09-26
AU6156800A (en) 2001-02-13
DE19934514C1 (en) 2001-02-08
WO2001007974A1 (en) 2001-02-01
US6754721B2 (en) 2004-06-22
DE19934514C5 (en) 2013-03-14
JP2003505984A (en) 2003-02-12

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