Control and data transmission installation and a process for the transmission of safety-related data
AssigneePhoenix Contact GmbH & Co. KG
InventorsThorsten Behr, Karsten Meyer-Gräfe
Life of this patent
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Abstract
A control and data transmission installation and a process for transmission of safety-related data in a control and data transmission installation. In accordance with the invention, safety procedures of existing field bus systems, particularly the interbus, are improved in such a way that there is no need either for additional lines for the transmission of control signals or redundant, safety-related units. In the inventive control and data installation, a master control device and a number of bus subscribers each include respective safety-related devices for carrying out predetermined safety functions. The safety-related devices can communicate with each other by way of a field bus.
Claims10
A control and data transmission installation, including:
- a serial field bus;
- and
- a master control device and a plurality of bus subscribers connected to the serial field bus, wherein
- the master control device includes one of a set of safety-related devices, each of the bus subscribers includes another one of the set of safety-related devices, and the safety-related devices are configured to carry out predetermined safety functions and to communicate with each other via the serial field bus;
- wherein each of the bus subscribers is connected to the serial field bus by a bus connecting device;
- wherein the bus connecting devices transmit safety-related data which are to be exchanged between the safety-related devices and which represent the safety condition of the respective bus subscribers via the serial field bus in useful data fields of predetermined data frames;
- wherein said one of the safety-related devices included in the master control device has a receiving device for receiving the safety-related data of each of the bus subscribers, an evaluation device for evaluating the received safety-related data and a device which, in response to the evaluated data, produces new safety-related data which are intended for the respective bus subscriber and which correspond to a predetermined safety function;
- wherein each of the safety-related devices has at least one input connected to a monitoring device;
- wherein said each of the safety-related devices is configured to negate an output signal of the monitoring device and to produce from the output signal and/or its negated output signal an item of check information representing the safety-related data to be transmitted;
- wherein the receiving device is adapted to receive the safety-related data, the negated data thereof and the check information;
- and
- wherein the producing device is adapted to produce the new safety-related data, the negated data thereof and a new item of check information.
A control and data transmission installation, including:
- a serial field bus;
- and
- master control device and a plurality of bus subscribers connected to the serial field bus, wherein
- the master control device includes one of a set of safety-related devices, each of the bus subscribers includes another one of the set of safety-related devices, and the safety-related devices are configured to carry out predetermined safety functions and to communicate with each other via the serial field bus;
- wherein each of the safety-related devices has at least one input connected to a monitoring device;
- and
- wherein said each of the safety-related devices is configured to negate an output signal of the monitoring device and to produce from the output signal and/or its negated output signal an item of check information representing the safety-related data to be transmitted.
A process for transmission of safety-related data in a control and data transmission installation, wherein the control and data transmission installation includes a serial field bus and bus subscribers and a master control device connected to the serial field bus, wherein the process includes the steps of:
- (a) implementing a data transmission protocol and a safety protocol for carrying out predetermined, installation-specific safety functions in each of the bus subscribers and in the master control device;
- (b) wherein the safety protocol produces, in response to output signals of a monitoring device associated with each of the bus subscribers, safety-related data which reflect the condition of the respective bus subscriber and transmits the same to a bus connecting device configured to implement the data transmission protocol;
- (c) wherein the bus connecting device transmits the safety-related data of the respective bus subscriber, in accordance with the data transmission protocol, in a useful data field of at least one predetermined data frame via the serial field bus to the master control device;
- (d) wherein, in implementing the safety protocol, the master control device receives the safety-related data from the bus subscriber, produces in dependence thereon new safety-related data which correspond to a predetermined safety function, and transmits the new safety-related data in a useful field of a data frame back to the corresponding bus subscriber;
- (e) wherein, in implementing the safety protocol, in response to the new safety-related data, the bus subscriber performs the predetermined safety function;
- and
- (f) wherein, in step b) the safety protocol negates the safety-related data and forms an item of check information from the safety-related data and/or the negated safety-related data and in step d), new safety-related data, new negated safety-related data, and a new item of check information are produced from the received safety-related data, the negated data thereof, and the check information.
Dependencies are inferred from the claim text.