DE102010053911A1 - Transfer system for transmitting and receiving messages in measuring system of e.g. cutting processing machine, for contact-less measurement at rotating tools in machine tool, has antenna receiving messages from transceiver unit - Google Patents

Abstract

The system has a transceiver unit sending messages (24) to another transceiver unit of two different frequencies (20, 22). The latter transceiver unit comprises two transceiver devices, which processes the messages from the former transceiver unit. The latter transceiver unit comprises an antenna, which is connected with the transceiver devices. The antenna receives messages from the former transceiver unit of two different frequencies. The transceiver devices are asynchronously operated independent of each other. An independent claim is also included for a method for transmitting and receiving messages in a measuring-or positioning system of a machine.

Description

background

A transmission system for transmitting and receiving messages in a measuring or positioning system of a machine and a method for transmitting and receiving messages in a measuring or positioning system of a machine, which can also be referred to as a "frequency hopping system", are described. The technique can be used in a measuring system for contactless and non-contact measurement on stationary and rotating tools in a machine tool.

State of the art

Measuring systems for use in cutting or material-removing (for example, milling, turning, grinding, planing, drilling, sinking, rubbing, erosion and the like) processing machines are known.

For determining the position or for determining the longest cutting edge of a rotating tool in machine tools, light barriers, in particular laser light barriers, or for pressing or pulling measurements are used. The measured position data are forwarded to a central controller, which uses this position data to control the tool of the machine tool.

To avoid extensive cabling, it is known to provide a radio link for the data transmission between the measuring system, that is light barrier or probe, and control unit.

The transmitted and received data will hereinafter be referred to as messages or acknowledgment messages.

Known transmission systems work in the transmission of messages with a frequency hopping method. A transmitter and a receiver change the transmission frequencies according to a predetermined sequence. It is necessary here that the transmitter and the receiver change the transmission frequency synchronously. To synchronize the transmitter and the receiver, the sending and receiving of messages takes place at specified time intervals. For example, if an event or a specific value is detected in a probe, that event or value can not be sent immediately. The probe must wait until the next time interval before it can send the event or value. The reaction time of such a system is increased by this kind of transmission.

If reflections or intersymbol interference occur, transmission of messages may fail. In known systems, therefore, the message is sent again in the next time interval. For a secure transmission to be achieved, the message must therefore be sent several times. Furthermore, there is the possibility that a transmission will not be achieved even after several repetitions. The synchronization between sender and receiver can be lost. This also requires resynchronization, which takes up time and battery capacity. These measures also increase the response time of such systems.

This is from the publication WO 2007/028964 A1 a measuring system in which the measured data between a probe and a controller using a radio link to be transmitted. The radio connection is a frequency spreading connection with a frequency hopping method. Also, this measurement system can not always meet real-time requirements required in the machine tool due to measurements and dependent tool control operations. Frequency hopping techniques have a delay time of about 20 ms. Such delay times can cause problems in particular when probing a probe to an object to be measured. In addition, such systems have a certain susceptibility to interference. This can result in particular in a measuring system in a machine tool interference problems, in which a plurality of probes send signals to a control unit. Since no control of the transmission power is provided, the proposed measuring system also has an increased energy requirement, which leads to disadvantages in a battery-powered mobile measuring system.

From the publication WO 2004/057552 A1 is another measuring system with a probe, which communicates via a radio link with a control unit known. In order to establish a first connection between the radio unit of the measuring probe and the control unit, a first message with a normal transmission power is transmitted. If the first transmission is unsuccessful, then the transmission power is increased step by step on subsequent transmissions until a connection is established between the radio unit of the probe and the controller. However, this method has the disadvantage that a connection between the radio unit of the probe and control is built only very slowly. Depending on whether a connection between the radio unit of the probe and Control comes, subsequent messages are sent with a successively increased transmission power until communication is possible. Since it is necessary to wait and see whether a connection between the radio unit of the measuring probe and the control system is established, this measuring system has the disadvantage that real-time prerequisites that are necessary in a measuring system for a machine tool can not be met. In addition, the energy consumption with constantly increased transmission power is permanently too high, since no reduction of the transmission power is provided. This leads to the requirement of a frequent battery change in a mobile measuring system.

task

It is therefore an object to provide a transmission system for transmitting and receiving messages in a measuring or positioning system of a machine, as well as a method for sending and receiving messages in a measuring or positioning system of a machine, with which a low energy consumption a robust and successful Transmission of messages takes place, whereby a successful transmission is achieved at any time despite occurring disturbances and messages can be transmitted redundantly.

solution

The task is solved with a transmission system for sending and receiving messages in a measuring or positioning system.

The transmission system for transmitting and receiving messages in a positioning system of a machine for this purpose has a first transmitting / receiving unit which is connected to a sensor for detecting measurement or position data in the machine, which includes a sensor antenna for sending / receiving messages and confirmation messages on at least two different frequencies, and which is adapted to communicate wirelessly with a second transceiver unit, and to send messages of the sensor to the second transceiver unit. In this case, the first transceiver unit is configured to transmit messages to the second transceiver unit on at least two different frequencies, wherein the second transceiver unit has at least two transceiver devices which are configured to transmit messages from the first transceiver. Receiving unit to process, and wherein the second transmitting / receiving unit has at least one first antenna which is connected to the transmitting / receiving means, and which is further adapted to receive messages from the first transmitting / receiving unit on at least two different frequencies.

The transmission system for transmitting and receiving messages in a measurement or positioning system of a machine further comprises a second transceiver configured to wirelessly communicate with a first transceiver and acknowledgment messages to messages of a sensor from the first transceiver / Receive unit to send. In this case, the second transceiver unit has at least two transceiver devices, which are designed to provide acknowledgment messages for messages from the first transceiver unit to the first transceiver unit on at least two different frequencies. Furthermore, the second transceiver unit has at least one first antenna, which is connected to the transceivers, and which is designed to transmit acknowledgment messages from the transceiver devices on at least two different frequencies.

Since the first transceiver transmits the messages on at least two different frequencies, interferences and reflections occurring on one of the frequencies are bypassed. Similarly, disturbances in one frequency by other systems also transmitting on that one frequency are bypassed by sending messages on the other of the at least two frequencies. In addition, it is possible to transmit messages that include, for example, the probing of a sensor on a workpiece as an event, redundantly on at least two different frequencies.

As a result of the design of the second transceiver unit with at least two transceivers, messages from the sensor, which are transmitted on the at least two different frequencies, are processed by one respective transceiver, depending on which frequency the message was transmitted ,

The second transceiver transmits an acknowledgment message on one of the at least two frequencies to the first transceiver on which it has previously received a message from the first transceiver. The confirmation message is generated by the transmitting / receiving device, which is designed for receiving / processing the message with one of the at least two frequencies.

As a result, no synchronization between the transmitting / receiving devices of second transmitting / receiving unit and the first transmitting / receiving unit.

The transmission system thereby reliably transmits messages and acknowledgment messages without increasing the response time of the system.

In one embodiment, the first transceiver unit and the second transceiver unit can wirelessly communicate bidirectionally with one another, so that both the first transceiver unit and the second transceiver unit can transmit and receive messages or acknowledgment messages.

The second transceiver unit may additionally include a second antenna configured to receive messages on at least one of the at least two different frequencies from the first transceiver unit and to return acknowledgment messages at least at that frequency. Moreover, the second transceiver unit includes means connected to the transceivers and the first and second antennas, the means each selecting one of the first and second antennas for transmitting / receiving messages and acknowledgment messages. This allows messages and acknowledgment messages to be received or sent at any time. In addition, messages can be received regardless of which of the at least two frequencies they were sent.

The second transceiver unit may also include a second antenna configured to receive messages on at least one of the at least two frequencies from the first transceiver unit and to return acknowledgment messages at least at that frequency, the transceiver devices each having one of the first and second antennas are connected. In this case, one of the first and second antennas is configured to receive messages from the first transceiver unit on a first of the at least two frequencies and to transmit acknowledgment messages from the respective transceiver unit on the first of the at least two frequencies. The other of the first and second antennas is configured to receive messages from the first transceiver unit on a second of the at least two frequencies and to transmit acknowledgment messages from the respective transceiver unit on the second of the at least two frequencies. As a result, messages and confirmation messages can also be received or sent at any time, and messages can also be received or transmitted, irrespective of which of the at least two frequencies they were sent. If, for example, the reception of a message from the first transmitting / receiving unit on the first antenna is disturbed by interferences or reflections, an alternative antenna characteristic is selected or a different spatial antenna arrangement of the second transmitting / receiving unit is achieved by selecting the second antenna.

The transceivers can operate asynchronously and independently of each other. It is determined by the first transmitting / receiving unit, at which time and on which frequency is sent. Thus, no synchronization between the first transmitting / receiving unit and the second transmitting / receiving unit is also required.

Each transceiver may further be configured to process messages and acknowledgment messages having one of the at least two different frequencies. In this case, for example, the first transmitting / receiving device is designed or intended to generate or process messages and confirmation messages which are transmitted / received on the first of the at least two frequencies, and the second transmitting / receiving device For example, it is designed or intended to generate or process messages and acknowledgment messages which have been transmitted / received on the second of the at least two frequencies. Thus, a transmission / reception device is available for messages / acknowledgment messages of a specific frequency.

The second transceiver unit may also be configured to monitor communication with the sensor. The second transmitting / receiving unit supplies information to a controller of the machine, which uses this information, for example, regulates processes or monitors the status of processing steps.

The second transceiver unit may further comprise at least one bandpass adapted to suppress out-of-band messages. Thus, messages sent by other systems and therefore not intended for the first and second transceiver units are not transmitted to the first and / or second transceiver means.

The second transceiver unit can additionally have a device which is suitable for this purpose is configured to forward the messages to and / or from the transmitting / receiving devices. The device serves to distribute the messages and confirmation messages depending on the frequency and belonging to transmitting / receiving device or antenna.

The second transceiver unit may further comprise a control unit configured to control the transceivers, the bandpass, the device and the device. The control unit can set the first and the second transmitting / receiving device successively to different frequencies, so that each message or each confirmation message is associated with one of the at least two frequencies, a corresponding transmitting / receiving device.

The first and second antenna and the sensor antenna may further have different antenna characteristics and / or a different spatial orientation. This makes it possible to send / receive messages or confirmation messages on at least two frequencies, which also differ greatly.

The first and second transceiver units can also be arranged within a machine room of the machine.

The messages may further include status information or data telegrams.

The transmission system may further comprise a machine interface connected to the second transmission / reception unit, which is designed to control the communication with the second transmission / reception unit and forms an interface to a machine control of the machine. Thus, the machine control unit is connected to the second transceiver unit and, for example, can also intervene in the communication with the first transceiver unit.

The transceivers may also transmit / receive the messages as radio frequency signals.

The messages may include the state of a battery, and / or the state of a probe tip of the sensor, and / or a touch of the probe tip on a workpiece and / or measurement or position data.

The task is also solved by a method for sending and receiving messages in a measuring or positioning system of a machine. In the method, a first transceiver unit connected to a sensor for acquiring measurement or position data in the machine sends a message to a second transceiver unit having at least two transceivers on a first one of at least two frequencies within one interval with a certain cycle time. The second transceiver transmits an acknowledgment message to the message transmitted by the first transceiver unit on the first of the at least two frequencies when the second transceiver unit receives a message from the first transceiver unit. The first transceiver unit notes the transmission attempt as successful, and sends after the cycle time of the interval another message on the first of the at least two frequencies when the first transceiver unit receives an acknowledgment message from the second transceiver unit. The first transceiver records a transmission attempt on the first of the at least two frequencies as unsuccessful if the first transceiver does not receive an acknowledgment message from the second transceiver, and the first transceiver then retransmits that message within the interval in which no acknowledgment message has been received on the message transmitted on the first of the at least two frequencies, to the second transceiver unit on the second of the at least two frequencies. The first transceiver unit either decreases the cycle time of the interval, and after the cycle time has elapsed, retransmits the message, or changes the transmission power of the message, if at any of the at least two frequencies within the interval, an acknowledgment message about the receipt of the message from the second one Transceiver unit was received.

The method avoids interferences and reflections that occur on one of the at least two frequencies because the first transceiver transmits the messages on at least two different frequencies. Similarly, disturbances in one frequency by other systems also transmitting on that one frequency are bypassed by sending messages on the other of the at least two frequencies. In addition, it is possible to transmit messages that include, for example, the probing of a sensor on a workpiece as an event, redundantly on at least two different frequencies.

The second transceiver transmits an acknowledgment message on one of the at least two frequencies to the first transceiver on which it has previously received a message from the first transceiver. The confirmation message is generated by the transmitting / receiving device, which for the Receiving / processing the message is formed with one of the at least two frequencies.

As a result, no synchronization between the transmitting / receiving devices of the second transmitting / receiving unit and the first transmitting / receiving unit must take place.

This reliably transmits messages and acknowledgment messages without increasing the system's response time.

Furthermore, the method enables reliable transmission of messages, even if no acknowledgment message about the reception of the message was received from the second transceiver unit at any of the at least two frequencies within the interval, by changing the transmission power of the message or decreasing the message Cycle time of the interval and resending the message after the cycle time has elapsed, a transmission of the message is ensured. Furthermore, reducing the cycle time does not or only slightly increases the response time of the system and still achieves transmission of the message.

The transceivers can operate asynchronously and independently of each other. It is determined by the first transmitting / receiving unit, at which time and on which frequency is sent. Thus, a synchronization between the first transmitting / receiving unit and the second transmitting / receiving unit is not required.

Each transceiver may further process messages and acknowledgment messages having one of the at least two different frequencies. For example, the first transceiver generates and processes messages and acknowledgment messages that are transmitted / received on the first of the at least two frequencies, and the second transceiver generates / processes, for example, messages and acknowledgment messages based on the second from the at least two frequencies are sent / received. Thus, messages / acknowledgment messages of a particular frequency are each processed / generated by one of the first and second transceivers.

In the method, further, the cycle time of the interval may be changed each time a message is not sent successfully.

Furthermore, the transmission power can be changed again in every interval in which a message can not be sent successfully.

As a result, the messages are sent successfully without an increase in the response time of the system, whereby the transmission power and / or the cycle time of an interval is / are changed.

In a further method, after a successful transmission of the message to the second transceiver unit, the original cycle time is restored. The transmission of messages / confirmation messages is done so without the cycle time is reduced in each interval so that sending the message is no longer possible.

Furthermore, it is possible in a further method that the transmission power remains constant after a successful transmission of the message to the second transmitting / receiving unit. This prevents that, for example in the case of a permanent malfunction of the measuring or positioning system by other systems, a renewed change in the transmission power must take place at each interval.

Additionally, in other methods, the second transceiver may transmit the acknowledgment message on the same frequency that the message was sent from the first transceiver.

The first and second transceiver units may be located within an engine room of the machine.

The messages may further include status information or data telegrams.

The transmission system may further comprise a machine interface connected to the second transceiver unit which controls communication with the second transceiver unit and interfaces with a machine controller of the machine. Thus, the machine control unit is connected to the second transceiver unit and, for example, can also intervene in the communication with the first transceiver unit.

The transceivers may also transmit / receive the messages as radio frequency signals.

The messages may include the state of a battery, and / or the state of a probe tip of the sensor, and / or a touch of the probe tip on a workpiece and / or measurement or position data.

Short description of the drawing

Other objects, features, advantages and applications will be apparent from the following description of non-limiting embodiments to be understood with reference to the accompanying drawings. All described and / or illustrated features alone or in any combination form the subject matter disclosed herein, also independent of their grouping in the claims or their relationships. The dimensions and proportions of the components shown in the figures are not necessarily to scale; they may differ from illustrated in embodiments to be implemented.

1 schematically shows a structure of the second transmitting / receiving unit.

2 schematically shows an alternative construction of the second transmitting / receiving unit.

3 schematically shows a further alternative construction of the second transmitting / receiving unit.

4 schematically shows transmission of messages and acknowledgment messages at two different frequencies.

Detailed description of the embodiments

In 1 schematically a construction of the second transmitting / receiving unit is shown. It will be in 1 not all components of the second transceiver shown.

The second transmitting / receiving unit points in 1 a first transmitting / receiving device 2 and a second transceiver 4 on. These are with a device 8th connected. The device 8th is also with a bandpass 10 connected, which with a first antenna 6 connected is. About the first antenna 6 become news 24 received from the first transmitting / receiving unit (not shown). Here is the first antenna 6 able to receive news 24 on at least two different frequencies 20 . 22 to recieve. The received messages 24 be in the bandpass 10 filtered so that messages sent from other systems and from the first antenna 6 be received, suppressed and not to the device 8th to get redirected. The device 8th routes the received and filtered messages 24 to the first and second transceiver devices 2 . 4 further. The device 8th is designed to do the news 24 that on the first frequency 20 received to the first transceiver 2 forward and news 24 that on the second frequency 22 received to the second transceiver 4 forward.

It can also be more than a bandpass 10 be arranged in the second transmitting / receiving unit, so that messages which are not intended for the second transmitting / receiving unit and have other frequencies can be suppressed. By means of such an arrangement, at least two specific frequency ranges can be defined for the second transceiver unit.

The first transmitting / receiving device 2 gets over the device 8th news 24 that with the first frequency 20 from the first antenna 6 were received. The first transmitting / receiving device 2 processes the received messages 24 and generates upon receipt of the message 24 a confirmation message 26 , The confirmation message 26 is about the device 8th and over the bandpass 10 from the first antenna 6 with the first frequency 20 sent to the first transceiver. Alternatively, the first transmitting / receiving device 2 directly with the first antenna 6 connected.

The second transmitting / receiving device 4 gets over the device 8th news 24 that with the second frequency 22 from the first antenna 6 were received. The second transmitting / receiving device 4 processes the received messages 24 and generates upon receipt of the message 24 a confirmation message 26 , The confirmation message 26 is about the device 8th and over the bandpass 10 from the first antenna 6 with the second frequency 22 sent to the first transceiver. Alternatively, the second transmitting / receiving device 4 directly with the first antenna 6 connected.

The device 8th However, it can also be configured to forward the confirmation messages 26 to the first antenna 6 and news 24 from the first antenna 6 to the transmitting / receiving devices 2 . 4 , certain confirmation messages 26 and news 24 , for example, which on the second frequency 22 be sent and on the second frequency 22 were received, against news 24 and confirmation messages 26 which is on the first frequency 20 be sent or on the first frequency 20 were received, forward first. This appears useful, for example, if it is known or was determined by the transmission system that on the second frequency 22 less or no interference occurs.

The first and second transceiver devices 2 . 4 Can the over the news 24 received data to a control unit 16 (in 1 not shown), which uses these for further evaluation. In addition, the control unit 16 connected to a machine control of the machine which controls the processes in the machine.

2 schematically shows an alternative construction of the second transmitting / receiving unit. As in 1 already noted, not all components of the second transmitter / receiver unit are shown here.

In the 2 illustrated transmitting / receiving unit differs from the in 1 shown transmitting / receiving unit that they additionally have a second antenna 12 and a facility 14 having. The first and second antenna 6 . 12 are with the device 14 connected. The device 14 always chooses one of the first and second antenna 6 . 12 to send and receive confirmation messages 26 and news 24 out.

The first antenna 6 receives / sends messages 24 / Confirmation messages 26 on the first frequency 20 , and the second antenna 12 receives / sends messages 24 / Confirmation messages 26 on the second frequency 22 , But it can also be news 24 / Confirmation messages 26 on the first and second frequency 20 . 22 from both the first and the second antenna 6 . 12 be received / sent. In this case, the first and second antenna 6 . 12 also have different antenna characteristics or a different spatial orientation. The news 24 can be received on a much wider frequency range.

A control unit 16 (in 2 not shown) controls the device 14 , The control unit 16 can therefore specify on which frequency 20 . 22 is transmitted, or which of the first and second antenna 6 . 12 for receiving messages 24 is selected. In addition, the control unit 16 the cycle time of an interval 30 to send / receive messages 24 and confirmation messages 26 set and change. The control unit 16 monitors the sent acknowledgment messages 26 and received messages 24 , and thus can monitor the transmission between the first transmitting / receiving unit and the second transmitting / receiving unit. In addition, the control unit 16 also the processes of the first and second transmitting / receiving device 2 . 4 and the device 8th control and change.

In 3 schematically another alternative construction of the second transmitting / receiving unit is shown. Like the 1 and 2 not all components of the second transmitter / receiver unit are shown here.

The second transmitting / receiving unit in 3 has a control unit 16 on, with the first and second transceiver 2 . 4 connected is. The first transmitting / receiving device 2 is over a bandpass 10 with a first antenna 6 connected. The second transmitting / receiving device 4 is over a bandpass 10 with the second antenna 12 connected.

In this embodiment, therefore, each transmitting / receiving device 2 . 4 a own bandpass 10 and a separate antenna 6 . 12 on. The second transmitting / receiving unit can thus at any time without switching between two antennas and / or the forwarding of messages 24 or confirmation messages 26 over the device 8th and furnishings 14 , News 24 received from the first transceiver and acknowledgment messages 26 send to the first transceiver.

4 schematically shows a transmission of messages 24 and confirmation messages 26 at two different frequencies 20 . 22 ,

The following is the transmission of messages 24 and confirmation messages 26 regarding 4 explained.

Area a)

If an event is detected by a sensor, the first transmitter / receiver unit sends a message 24 on a first frequency 20 to the second transmitting / receiving unit. When the second transceiver unit receives the message 24 is received from the first or second transceiver 2 . 4 a confirmation message 26 about receiving the message 24 generated and this on the first frequency 20 sent to the first transceiver.

If the first transceiver receives an acknowledgment message 26 to the message she sent 24 within the cycle time of an interval 30 , the first transceiver notes this attempt to send as successful.

After the previous sending attempt from the first transmitting / receiving unit has been noted as successful, the first transmitting / receiving unit transmits in a subsequent interval 30 again a message 24 on the first frequency 20 , On this message 24 The second transceiver also sends a confirmation message 26 to the first transceiver on the first frequency 20 Posted.

As long as the messages sent 24 If the transmission attempt was successfully recorded, the frequency on which the first transmission / reception unit transmits is not changed.

Area b)

Sends the first send / receive unit a message 24 on the first frequency 20 to the second transceiver and receives no acknowledgment message 26 so she notes this attempt to send unsuccessful. The first transceiver then sends the message 24 immediately on the second frequency 22 to the second transmitting / receiving unit. The second transceiver then transmits after the message 24 received, one of the first or second transceiver 2 . 4 generated confirmation message 26 to the first transceiver on the second frequency 22 , This transmission attempt is noted by the first transmitting / receiving unit as successful.

Area c)

After the previous transmission attempt at the second frequency 22 has been noted as successful sends the first transceiver in the following interval 30 a message 24 on the second frequency 22 to the second transmitting / receiving unit. The message 24 is received by the second transmitting / receiving unit, and one of the first or second transmitting / receiving means 2 . 4 generated in response to the message 24 a confirmation message 26 , The confirmation message 26 will be on the second frequency 22 sent to and received from the first transceiver.

Area d)

The first transceiver transmits a message 24 on the second frequency 22 because in the previous interval 30 the sending attempt was noted as successful. Does the first transceiver receive no acknowledgment message 26 from the second transceiver unit, the first transceiver unit notes the transmission attempt on the second frequency 22 as unsuccessful and sends the message 24 immediately on the first frequency 20 to the second transmitting / receiving unit. Receives the first transmitter / receiver unit also on the first frequency 20 no confirmation message 26 , the first transmitting / receiving unit notes the attempt to transmit both on the first frequency 20 as well as on the second frequency 22 as not successful.

Area e)

In the following interval 30 then the transmission power with which the message 24 is sent, changed. The transmit power is either decreased or increased and the message 24 on the second frequency 22 sent to the second transceiver. The second transceiver transmits an acknowledgment message 26 on the second frequency 22 to the first transceiver after the message 24 , with changed transmission power on the second frequency 22 was received from the second transmitting / receiving unit. The first transceiver then notes this attempt to send as successful.

Alternatively, the cycle time of the interval 30 be reduced, and after the cycle time the message 24 be sent again. Will then the message 24 Sent successfully to the second transceiver, the original cycle time of the interval 30 restored. Alternatively, the changed cycle time of the interval 30 also be maintained.

Area f)

In the following interval 30 the first transceiver sends a message 24 with changed transmission power on the second frequency 22 to the second transmitting / receiving unit. The second transceiver transmits an acknowledgment message 26 on the second frequency 22 to the first transceiver after the message 24 was received.

The transmission power with which the first transmission / reception unit receives the message 24 sends to the second transmitting / receiving unit, but may also correspond again to the original transmission power.

In every interval 30 in which a message 24 could not be sent successfully, also the transmission power can be changed.

The repetition of the broadcast of the news 24 For example, in reducing the cycle time of the interval 30 , may be limited to a certain number of repetitions.

The news 24 and the confirmation messages 26 be from the send / receive units 2 . 4 sent as high-frequency signals. This includes the news 24 Status information or data telegrams. The news 24 may indicate the state of a battery of the first transmitting / receiving unit, the state of a probe tip of the sensor, a touch of the probe tip a workpiece and / or measurement or position data include.

The control unit 16 may be a microprocessor or a programmable logic device, such as FPGA or CPLD. In selected embodiments, the control unit 16 and the first and second transceiver devices 2 . 4 connected via a serial data bus. In this case, the first or second transmitting / receiving device reports 2 . 4 the receipt of a message 24 the control unit 16 by means of an interrupt. It is also provided that the control unit 16 both the first and the second transceiver 2 . 4 successively to different frequency ranges, ie the first and second transceiver 2 . 4 to the first or second frequency 20 . 21 , sets.

Furthermore, it is also possible that both the first and the second transceiver unit are designed to receive messages 24 and confirmation messages 26 on more than two frequencies 20 . 21 to send and receive.

It would also be conceivable to provide a plurality of transmitting / receiving devices in the second transmitting / receiving unit. In addition, a communication of the second transmitting / receiving unit with a plurality of first transmitting / receiving units is possible. In this case, one frequency and / or one transmitting / receiving device can each be assigned to a specific first transmitting / receiving unit.

By the embodiments shown and in the 4 shown transmission of messages 24 and confirmation messages 26 These can be transmitted in a measuring or positioning system in a machine in a very short time from the first and second transmitting / receiving unit to the second and first transmitting / receiving unit. This achieves a fast reaction time. In addition, a high repetition accuracy is achieved by the high constancy of the reaction time. This is particularly necessary, for example, for highly accurate measurement results in a machine tool.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2007/028964 A1 [0008]
• WO 2004/057552 A1 [0009]

Claims (29)

Transmission system for sending and receiving messages ( 24 ) in a measuring or positioning system of a machine, having a first transceiver unit connected to a sensor for acquiring measurement or position data in the machine, comprising a sensor antenna for transmitting / receiving messages ( 24 ) and confirmation messages ( 26 ) on at least two different frequencies ( 20 . 22 ), and which is adapted to - communicate wirelessly with a second transceiver unit, and - messages ( 24 ) of the sensor to the second transmitting / receiving unit, wherein the first transmitting / receiving unit is adapted to receive messages ( 24 ) to the second transceiver on at least two different frequencies ( 20 . 22 ), the second transceiver unit having at least two transceivers ( 2 . 4 ), which are adapted to receive messages ( 24 ) from the first transceiver unit, and wherein the second transceiver unit has at least one first antenna ( 6 ) connected to the transceivers ( 2 . 4 ), and which is adapted to receive messages ( 24 ) from the first transceiver on at least two different frequencies ( 20 . 22 ) to recieve. Transmission system for sending and receiving messages ( 24 ) in a measuring or positioning system of a machine, with a second transceiver unit, which is designed to: - communicate with a first transceiver unit wirelessly, and - confirmation messages ( 26 ) on messages ( 24 ) of a sensor from the first transmitting / receiving unit, and wherein the second transmitting / receiving unit has at least two transmitting / receiving devices ( 2 . 4 ), which are adapted to receive confirmation messages ( 26 ) on messages ( 24 ) from the first transmitting / receiving unit to the first transmitting / receiving unit at at least two different frequencies ( 20 . 22 ), and at least one first antenna ( 6 ) connected to the transceivers ( 2 . 4 ), and which is adapted to receive confirmation messages ( 26 ) from the transceiver devices ( 2 . 4 ) on at least two different frequencies ( 20 . 22 ) to send. Transmission system according to claim 1 and 2, wherein the first transmitting / receiving unit and the second transmitting / receiving unit communicate bidirectionally with each other wirelessly. Transmission system according to one of claims 1 to 3, wherein the second transmitting / receiving unit, a second antenna ( 12 ), which is adapted to receive messages ( 24 ) on at least one of the at least two different frequencies ( 20 . 22 ) from the first transceiver and receive acknowledgment messages ( 26 ) on at least that frequency, and a facility ( 14 ) connected to the transceivers ( 2 . 4 ) and the first and second antenna ( 6 . 12 ), the device ( 14 ) one each of the first and second antenna ( 6 . 12 ) for sending / receiving messages ( 24 ) and confirmation messages ( 26 ) selects. Transmission system according to one of claims 1 to 3, wherein the second transmitting / receiving unit, a second antenna ( 12 ), which is adapted to receive messages ( 24 ) on at least one of the at least two frequencies ( 20 . 22 ) from the first transceiver and receive acknowledgment messages ( 26 ) on at least this frequency, the transceiver devices ( 2 . 4 ) each with one of the first and second antenna ( 6 . 12 ), one of the first and second antennas ( 6 ; 12 ) is designed to receive messages ( 24 ) from the first transceiver on a first of the at least two frequencies ( 20 ; 22 ) and receive confirmation messages ( 26 ) from the respective transmitting / receiving device ( 2 . 4 ) on the first of the at least two frequencies ( 20 . 22 ), and the other of the first and second antennas ( 12 ; 6 ) is designed to receive messages ( 24 ) from the first transceiver on a second of the at least two frequencies ( 22 ; 20 ) and receive confirmation messages ( 26 ) from the respective transmitting / receiving device ( 4 . 2 ) on the second of the at least two frequencies ( 22 ; 20 ) to send. Transmission system according to one of the preceding claims, wherein the transmitting / receiving devices ( 2 . 4 ) operate asynchronously and independently of one another, and wherein each transceiver device ( 2 . 4 ) for processing messages ( 24 ) and confirmation messages ( 26 ), one of the at least two different frequencies ( 20 . 22 ) is formed. Transmission system according to one of the preceding claims, wherein the second transmitting / receiving unit is adapted to monitor the communication with the sensor. Transmission system according to one of the preceding claims, wherein the second transceiver unit comprises at least one bandpass ( 10 ) adapted to receive messages located outside the frequency ranges ( 24 ) to suppress. Transmission system according to one of the preceding claims, wherein the second transceiver unit comprises a device ( 8th ) adapted to receive the messages ( 24 ) / Confirmation messages ( 26 ) to and / or from the transceivers ( 24 ) forward. Transmission system according to one of the preceding claims, wherein the second transceiver unit comprises a control unit ( 16 ), which is adapted to the transmitting / receiving devices ( 2 . 4 ), the bandpass ( 10 ), the device ( 8th ) and the facility ( 14 ) to control. Transmission system according to one of the preceding claims, wherein the control unit ( 16 ) is adapted to the transmitting / receiving devices ( 2 . 4 ) successively to different frequencies ( 20 . 22 ) to send and receive. Transmission system according to one of the preceding claims, wherein the first and second antennas ( 6 . 12 ) and the sensor antenna have different antenna characteristics and / or a different spatial orientation. Transmission system according to one of the preceding claims, wherein the first and the second transceiver unit are arranged within a machine room of the machine. Transmission system according to one of the preceding claims, wherein the messages ( 24 ) Comprise status information or data telegrams. Transmission system according to one of the preceding claims, wherein the transmission system comprises a machine interface connected to the second transceiver unit, which is adapted to control the communication with the second transceiver unit, and which interfaces with a machine controller of the machine. Transmission system according to one of the preceding claims, wherein the transceiver units transmit the messages ( 24 ) as high-frequency signals send / receive. Transmission system according to one of the preceding claims, wherein the messages ( 24 ) - the state of a battery, and / or - the state of a probe tip of the sensor, and / or - a touch of the probe tip on a workpiece and / or - measurement or position data include. Method for sending and receiving messages ( 24 ) in a measuring or positioning system of a machine, wherein a first transmitting / receiving unit, which is connected to a sensor for detecting measurement or position data in the machine, receives a message ( 24 ) to a second transceiver unit comprising at least two transceivers ( 2 . 4 ), on a first of at least two frequencies ( 20 ; 22 ) within an interval ( 30 ) transmits with a certain cycle time, the second transceiver unit sends an acknowledgment message ( 26 ) to the message sent by the first transceiver ( 24 ) on the first of the at least two frequencies ( 20 ; 22 ) if the second transceiver unit sends a message ( 24 ) from the first transceiver unit; the first transmitting / receiving unit notes the attempt to send and after the cycle time of the interval ( 30 ) another message ( 24 ) on the first of the at least two frequencies ( 20 ; 22 ) if the first transceiver unit sends an acknowledgment message ( 26 ) from the second transceiver unit; the first transceiver performs a transmission attempt on the first of the at least two frequencies ( 20 ; 22 ) is not successfully noted if the first transceiver does not receive a confirmation message ( 26 ) is received by the second transceiver unit, and the first transceiver unit then receives this message ( 24 ) again within the interval ( 30 ), in which no confirmation message ( 26 ) on the first of the at least two frequencies ( 20 ; 22 ) sent message ( 24 ) to the second transceiver unit on the second of the at least two frequencies ( 22 ; 20 ) sends; and the first transceiver unit when at any of the at least two frequencies ( 20 . 22 ) within the interval ( 30 ) a confirmation message ( 26 ) about the receipt of the message ( 24 ) was obtained from the second transceiver unit, either the cycle time of the interval (FIG. 30 ) and, after the cycle time has elapsed, the message ( 24 ) again, or - the transmission power of the message ( 24 ) changes. The method of claim 18, wherein the transceivers ( 2 . 4 ) operate asynchronously and independently of one another, and wherein each transceiver device ( 2 . 4 ) for processing messages ( 24 ) and Confirmation messages ( 26 ), each one of the at least two different frequencies ( 20 . 22 ) is formed. Method according to claim 18 or 19, wherein the cycle time of the interval ( 30 ) is changed every time a message ( 24 ) was not sent successfully. Method according to one of the preceding claims, wherein the transmission power at each interval ( 30 ), in which a message ( 24 ) can not be sent successfully, is changed. Method according to one of the preceding claims, wherein after a successful transmission of the message ( 24 ) is restored to the second transceiver unit the original cycle time. Method according to one of the preceding claims, wherein the transmission power after a successful transmission of the message ( 24 ) remains constant at the second transmitting / receiving unit. Method according to one of the preceding claims, wherein the second transceiver unit transmits the confirmation message ( 26 ) on the same frequency ( 20 . 22 ), on which the message ( 24 ) was sent from the first transceiver. Method according to one of the preceding claims, wherein the first and second transmitting / receiving unit are arranged within a machine room of the machine. Method according to one of the preceding claims, wherein the messages ( 24 ) Comprise status information or data telegrams. Method according to one of the preceding claims, wherein a machine interface connected to the second transmitting / receiving unit controls the communication with the second transmitting / receiving unit, and forms an interface to a machine control of the machine. Method according to one of the preceding claims, wherein the transceiver units receive the messages ( 24 ) as high-frequency signals send / receive. Method according to one of the preceding claims, wherein the messages ( 24 ) - the state of a battery, and / or - the state of a probe tip of the sensor, and / or - a touch of the probe tip on a workpiece and / or - measurement or position data include.

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