EP1469440B1 - Method for transmission of security information. - Google Patents

Description

The invention relates to a method for data transmission between a mobile radio transmitter and a radio receiver of a machine or plant. Furthermore, a radio transmitter and a radio receiver are to be offered for carrying out the method.

Mobile radio transmitters usually have a transmitter / receiver unit, so they work with a physical channel. If safety-relevant information is transmitted together with non-safety-related information via this channel, there is a risk that safety-relevant information will be blocked by non-safety-relevant information and thus transmitted with a delay. Radio links also provide less favorable conditions than cable for the transmission of time-critical information, since the information requires a much longer period of time for transmission.

If a radio connection is used to transmit safety-related information, it must be ensured that it is not blocked by non-safety-related information, that it requires the shortest possible time for transmission and that no outdated information is transmitted.

In the GB 2297667 A a portable control device is described, which is particularly intended for use by a disabled person. In this case, the person with the control device can send first control signals over a radio transmission path with a long range and second control signals over an infrared transmission path with a short range to an object used by it, for example a vehicle. In order to avoid accidents, control signals, In the execution of which safety requirements must be met, are triggered only on the infrared transmission link. For this, the person must have approached the object to be controlled up to visual contact. Only then, because of the short range of the infrared transmission path, functions can be triggered before the execution of which the person was able to convince himself that no accidents could occur during their execution.

In the DE 102 21 189 A1 An industrial controller is described in which peripheral units with sensor / actuator elements for data traffic are connected to a central control unit via radio interfaces. In this case, each peripheral unit has a peripheral transceiver unit. The central control unit is assigned at least two functional units whose antennas have a different spatial arrangement or orientation. For at least one peripheral unit, a radio link with at least two radio units is possible. The peripheral units can be classified according to time-critical requirements. For higher rated peripherals radio links are provided with two physically separate radio paths, for lower rated peripheral units a radio path with a radio unit. This classification is stored in a memory list of the central control unit and can be modified in changed circumstances, eg. B. when converting a production line.

From the DE 38 13 590 A1 are known a machine tool and an associated control for driving the drive means for performing machine operations. These are designed so that working with the protective housing open, especially setting up the machine, is facilitated and meets all safety requirements. For this purpose, the controller has a removable remote control part with an input field and transmitting means for transmitting the commands and data for machine control. Accordingly, the machine has at least one coupling part connected to the control Receiving the commands and data transmitted by the remote control part and data lines for transmitting the received commands and data to the controller. The remote control section has an additional emergency stop button in addition to a field of selection buttons for activating machine operations. This is connected to a separate transmitter via an emergency stop transmitter module. This provides, in addition to the wireless data transmission between remote control and control, a separate channel for an emergency shutdown.

The invention has for its object to offer a particularly reliable method for data transmission between a mobile control unit radio transmitter and a radio receiver of a machine or system. Furthermore, a radio transmitter and a radio receiver for carrying out such a method are to be offered.

The object is achieved for the method by the features of patent claim 1. Advantageous process variants are described in the dependent claims 2-10. For the radio transmitter, the object is achieved by claim 11 and for the radio receiver by claim 12.

The method according to the invention for data transmission provides that security-relevant information about the SCO connection of a first radio connection and non-security-relevant information about the ACL connection of a second radio connection of a radio system according to Bluetooth standard between the mobile radio transmitter and the radio receiver of the machine or system transmit become.

The use of two separate wireless connections ensures that security-relevant information can be transmitted and that no blockade or impairment of a transmission channel, eg due to non-safety-relevant information, can take place. By using a separate wireless connection for transmitting security-relevant Information improves the reliability of data transmission.

Advantageously, the first and second radio link are constructed simultaneously and operated in parallel next to each other.

According to a further advantageous variant of the method, the first radio link for transmitting security-relevant information is operated independently of the second radio link with a maximum packet life.

In a further advantageous variant of the method, the first radio link for transmitting security-relevant information is operated synchronously to the second radio link.

If the first radio connection offers a larger number of data fields ("slots") than is necessary for the security-relevant information to be transmitted, duplicates of the security-relevant information can be sent via the first radio connection, thereby further increasing the reliability of the data transmission. To limit the duration of the transmission, the number of duplicates to be transmitted can be specified and limited.

According to a further variant of the method, duplicates of security-relevant information can be transmitted until new security-relevant information is available and / or until the transmitted information has been received correctly. As a result, the transmission reliability is further improved.

Duplicates of safety-relevant information received without error in the radio receiver are only passed on once and processed further. Corresponding further duplicates received without errors will be destroyed.

According to a further variant of the method, the first and second radio connection can be established via a single radio system, whereby a cost-saving and compact design is achieved.

According to a further variant of the method, two separate radio systems can be provided, whereby even in case of failure of a radio system, e.g. of the radio system for the transmission of non-safety-relevant information, a radio transmission of the safety-relevant information is ensured. Advantageously, in case of failure of a radio system, the respective still functioning radio system can take over the transmission of safety-related information.

According to the invention, security-relevant information is transmitted via a first radio connection in accordance with the Bluetooth standard in SCO mode and the non-security-relevant information is transmitted via the second radio connection in accordance with the Bluetooth standard in ACL mode.

The first and the second radio connection can be established via a single radio system according to the Bluetooth standard, which is operated in parallel in SCO mode and in ACL mode.

FIG 1

eine schematische Darstellung einer Datenübertragung zwischen einem Funksender und einem Funkempfänger, der mit einer Maschine/Anlage in Verbindung steht,

FIG 2

eine Datenübertragung über ein einziges Funksystem,

FIG 3

eine Datenübertragung über zwei separate Funksysteme sowie

FIG 4

eine Datenübertragung von Duplikaten von sicherheitsrelevanten Informationen.

The invention is explained in more detail with reference to embodiments in the drawing figures. Show it:

FIG. 1

a schematic representation of a data transmission between a radio transmitter and a radio receiver, which is in communication with a machine / plant,

FIG. 2

a data transmission via a single radio system,

FIG. 3

a data transmission via two separate radio systems as well

FIG. 4

a data transfer of duplicates of security-relevant information.

FIG. 1 shows a radio transmitter 1 for data transmission over a radio link 2 with a radio receiver 3, which communicates with a machine / plant 4. According to the described method for data transmission, a first and a second radio connection are established via the radio link 2.

In general, each radio transmitter 1 can also be designed as a receiver and each radio receiver 3 as a transmitter to allow bidirectional communication (not shown in detail).

To FIG. 2 the first and second radio connection via a single radio transmitter 1 and a single radio receiver 3 (ie a single radio system) can be constructed and can over the radio link 2 security information of the radio transmitter 1 via the first radio link 6 and non-safety-related information via the second radio link. 7 be transmitted.

FIG. 3 shows a data transmission with separate radio transmitters 1a and 1b and separate radio receivers 3a and 3b (ie two separate radio systems), via radio transmitter 1a and radio receiver 3a safety-related information of the radio transmitter 1 and radio transmitter 1b and radio receiver 3b non-safety-relevant information in each case via radio links 10 and 11 are transmitted.

FIG. 4 shows safety-related information 1 _x generated over time on axis 12 (time axis). These are sent as duplicates l 'on the axis 13 in the radio transmitter 1 and received by the radio receiver 3 on the axis 14. Duplicates l received without errors are deleted in the radio receiver 3 and the non-deleted duplicates l are forwarded to the machine / system 4 on axis 15.

Claims (12)

1. Method for data transmission between a mobile radio transmitter and a radio receiver of a machine or system, wherein
   safety-related information is transmitted via the SCO connection of a first radio link and safety-unrelated information is transmitted via the ACL connection of a second radio link of a radio system in accordance with the Bluetooth standard between the mobile radio transmitter and the radio receiver of the machine or system.
2. Method according to claim 1, wherein the first and second radio links are established simultaneously and operated in parallel.
3. Method according to claim 1 or 2, wherein the first radio link is operated with a maximum packet lifespan.
4. Method according to claim 1 or 2, wherein the first radio link is operated synchronously with the second radio link.
5. Method according to one of the preceding claims, wherein duplicates of safety-related information are transmitted via the first data link.
6. Method according to claim 5, wherein a predefinable number of duplicates are transmitted.
7. Method according to claim 5 or 6, wherein duplicates of safety-related information are transmitted until such time as new safety-related information is available.
8. Method according to one of claims 5 to 7, wherein duplicates of safety-related information are transmitted until such time as the transmitted safety-related information is correctly received.
9. Method according to one of the preceding claims, wherein the first and the second radio link are established over a single radio system.
10. Method according to one of the preceding claims, wherein safety-related and safety-unrelated information are transmitted over a single radio system in accordance with the Bluetooth standard which is operated in parallel in SCO and ACL connection mode.
11. Radio transmitter for performing the method for data transmission according to one of claims 1 to 10.
12. Radio receiver for performing the method for data transmission according to one of claims 1 to 10.

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