DEVICE AND METHOD FOR ADDRESSING, AND CONVERTER

Abstract

It is provided to implement a different number of logical slaves in a field device for use in an AS interface network as a function of the assigned address, which slaves may be addressed using the assigned address in the standard or in the expanded addressing mode. Thus, in a field device, it is possible to provide slaves having different profiles, via which different data types may be exchanged. Furthermore, a method is provided, with which a field device having different slaves is able to be addressed in a simple manner while avoiding double addressing.

Claims

1-41. (canceled)

42. A system, comprising: a device adapted to connect to a bus; wherein the device is adapted to implement a single logical slave as a bus participant in a first mode and at least two logical slaves as bus participants in a second mode; wherein the first mode is a standard addressing mode, and the second mode is an expanded address mode; wherein the device includes a reversing logic adapted to shift the device from the first mode to the second mode to switch the device from a standard address to an expanded address to implement the at least two logical slaves in a single addressing process, the at least two logical slaves being made available as bus participants immediately after the addressing; wherein the at least two logical slaves are operable in the second mode in the expanded address mode in respective cycles by an address assigned by a standard addressing signal; and wherein the at least two logical slaves have profiles that differ from each other.

43. The system according to claim 42, wherein the bus includes a field bus, a CAN, a CAN-Open, a DeviceNet, a Profibus, an INTERBUS, an AS interface, an Ethernet, a Wireless-LAN, an EIB, and/or an LCN.

44. The system according to claim 42, wherein the first mode is implemented when an address 0 is assigned, and the second mode is implemented when an address other than 0 is assigned.

45. A method of addressing a device connectable to a bus, the device being provided with a standard address before the addressing and operating in a first mode, comprising: performing a single assigning of another address to the device; and implementing, in the device, at least two logical slaves in a second mode in response to the single assigning of the other address, the second mode being an expanded addressing mode, the second mode being made available immediately after assigning the other address to the device, the at least two logical slaves being addressed by the assigned address in alternation in sequential cycles; wherein the at least two logical slaves have profiles that differ from each other.

46. The method according to claim 45, wherein the bus includes a field bus, a CAN, a CAN-Open, a DeviceNet, a Profibus, an INTERBUS, an AS interface, an Ethernet, a Wireless-LAN, an EIB, and/or an LCN.

47. The method according to claim 45, wherein the first mode is implemented when an address 0 is assigned, and the second mode is implemented when an address other than 0 is assigned.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0069] FIG. 1 is a function diagram of a field device after assignment of the address 0.

[0070] FIG. 2 is a function diagram of a field device according to an example embodiment of the present invention after assignment of an address other than 0.

[0071] FIG. 3 is a schematic view of a field device according to an example embodiment of the present invention,

[0072] FIG. 4 illustrates the state machine of a microprocessor according to an example embodiment of the present invention.

[0073] FIG. 5 illustrates a converter having a motor as a field device according to an example embodiment of the present invention.

DETAILED DESCRIPTION

[0074] FIG. 1 shows the function diagram of a field device 1 according to an example embodiment of the present invention if it has been assigned the address 0. This is the case, for example, if field device 1 is newly installed in the delivery state or is re-installed in the AS interface network after a servicing.

[0075] Field device 1 is connected to an AS interface line 2 via a connection line 4 and a connection 8 at a connection point. It participates in the AS interface network via this connection line 4 as though connection lines 4 were connected via inner lines 5 to a slave 3 having a standard profile, for example, the profile S-7.F.F. Here, slave 3 and inner lines 5 are virtual, that is, field device 1 simulates the function illustrated.

[0076] With the aid of the address 0, a master that is also connected to the AS interface line may now detect field device 1 as a new participant and assign a free address to it, in the manner typical of AS interfaces, as is described in DE 197 43 981, for example. Alternatively, this address assignment may be carried out with a conventional addressing device.

[0077] FIG. 2 shows the function diagram of a field device 1 according to an example embodiment of the present invention if this has been assigned an address other than 0. This may be the case, for example, if field device 1 was detected by a master as a new participant and occupied with a free address.

[0078] Field device 1 is connected to an AS interface line 2 via a connection line 4 at a connection 8 in a connection point. In contrast to the case illustrated in FIG. 1, it participates in the AS interface network via this connection line as a bus participant of the bus system as though connection lines 4 were connected via inner lines 7 and an inner branching 6 to two slaves 3A and 3B. Advantageously, these slaves have different profiles, for example, slave 3A the profile S-7.A.7 for a quick binary and thus bit-oriented input and output, and slave 3B profile S-7.A.5 for additional digital and thus byte-oriented input and output.

[0079] The AS interface network is now operated in the expanded addressing mode, and slave 3A responds to the address of field device 1 in the A cycle, while slave 3B responds to the address of field device 1 in the B cycle.

[0080] Field device 1 thus simulates the connection of two slaves 3A and 3B to the AS interface network, slave 3A using the address of field device 1 as A address, while slave 3B uses this address as B address. Thus, a logical slave at address 0 becomes two or more logical slaves having profiles that may be predefined arbitrarily if the address is not 0.

[0081] In an exemplary embodiment according to the present invention, field device 1 simulates the connection of three, four or more slaves via connection line 4 if the address 0 was not assigned to it. For the simulation of more than two slaves, more than one address is assigned to the field device, which are able to be used in the expanded addressing method analogously to the example from FIG. 2, or an addressing mode is used, which has three, four, or more different cycles according to the type of the expanded addressing mode.

[0082] FIG. 3 shows an exemplary embodiment of a field device according to the present invention. A field device 1 is connected via connection lines 4 to an AS interface line 2 and includes a conventional slave IC 10, that is, an integrated circuit, and a microprocessor 11. Slave IC 10 is operated in the transparent mode and thus relays the data obtained from AS interface line 2 via connection lines 4 to microprocessor 11 via an internal data line 12 and relays data received from microprocessor 11 via an additional internal data line 14 to AS interface line 2. Additionally, this microprocessor 11 obtains from slave IC 10 the clock signal via an additional internal data line 13. The state machine of at least one AS interface slave is represented in the firmware of microprocessor 11, that is, the finite machine, which models all possible states of the AS interface slaves and the permitted transitions between these states. Such state machines are described in A. Hunt and D. Thomas: State Machines, IEEE Software November/December 2002, p 10-12. Thus, two or more logical slaves are able to be implemented in microprocessor 11, and microprocessor 11 may simulate a predefined number of logical slaves depending on the assigned address, which is transmitted from an addressing device or the master via slave IC 10.

[0083] FIG. 4 illustrates schematically the state machine of a microprocessor 11 as it may be implemented in FIG. 3. After a RESET signal 31 or in the delivery state, microprocessor 11 is in a first mode 30, in which it is assigned an address via standard addressing signals 32 from the AS interface bus and enters a state 33 of a second mode. This transition may be brought about by a reversing logic. The second mode includes this state 33 and additional states 34, which at least include the possible states of two logical slaves 3A, 3B. In particular, state 33 therefore describes two logical slaves that may be operated in the expanded addressing mode, an each one in one of the two cycles and using the address assigned by standard addressing signal 32. Between these states 33, 34 transitions 35 are brought about through bus commands, data from sensors or actuators connected to the microprocessor, or through sending commands to actuators, as necessary and typical for the implementation of the at least two logical slaves 3A, 3B.

[0084] FIG. 5 shows a use of a field device from FIG. 1 through 4. The field device is a converter 50, which is connected to an electromotor 52 and which controls or regulates it. Converter 50 is furthermore connected to a field bus 54, an AS interface bus, for example, more exactly one connection line 55 connecting a slave 58 included by converter 50 to field bus 54 via a connecting point 53. Slave 58 is thus integrated in converter 50; it is operated in the transparent mode. A microprocessor, which is designed as control 56 of converter 50, takes on the data forwarded by the slave according to the array in FIG. 3 and processes it with the aid of a state machine stored in it as shown in FIG. 4. Control 56 is simultaneously used for the control or regulation of motor 52, which is functionally typical for a converter, to wit, through the control of a power electronics 60 connected to the latter. Microprocessor 11 from FIG. 3 is thus advantageously integrated into control 56 of converter 50, which is necessary anyway and which is therefore present. Actuators 62 and sensors 64, 66 are connected to control 56 directly or via an additional bus 68 and are possibly integrated in motor 52, as shown exemplarily for sensor 66. Converter 50 is thus designed as a field device, as is advantageous for applications of the decentralized technology.

[0085] In particular, device(s) are integrated in converter 50 that allow for a use of converter 50 as a bus participant. The provision according of two logical slaves by a corresponding state machine in control 56 particularly advantageously makes it possible on the one hand for binary data for the control of actuators 62 or sensors 64, 66 to be exchanged between field bus 54 and converter 50, and on the other hand for byte-oriented data, for example, in the form of parameters for converter 50 or of commands for operating motor 52 or in the form of information about the state of converter 50 or motor 52, to be transferred.

[0086] In an exemplary embodiment according to the present invention, instead of the AS interface bus, another field bus, in particular CAN, CAN-Open, DeviceNet, Profibus, INTERBUS, Ethernet, Wireless-LAN, EIB, LCN may be provided.