Safety module for an automation system, automation system and method for operating a safety module in an automation system

Patent metadata

Field	Value
Publication number	US-10761493-B2
Application number	US-201715816320-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Nov 21, 2016
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A safety module for an automation system includes a communication interface designed for a signal-transmitting connection to a communication system, an output interface designed for a signal-transmitting connection to at least one user which can be fitted downstream and a processing device connected to the communication interface and the output interface and designed to process communication signals from the communication interface and to provide output signals to the output interface wherein the processing device is designed for a detection of an actual component behaviour, using a control command contained in a communication signal and a component measured value contained in a communication signal, and for a comparison of a presettable component behaviour to the actual component behaviour as well as for a provision of a safety-oriented output signal to the output interface at a presettable divergence between the presettable component behaviour and the actual component behaviour.

First claim

What is claimed is:

1. An automation system for operating at least one actuator, the automation system comprising:
a higher-order control unit, to which are assigned a communication system and a safety control unit;
a lower-order control unit, which is connected to the communication system and comprises a bus node, at least one input module, at least one safety module for a provision of operating energy to an actuator and an internal communication system connecting the bus node, the at least one input module and the at least one safety module;
at least one actuator connected to the safety module; and
at least one sensor device connected to the input module and designed for a detection of an actuator movement,
wherein the bus node is designed for a conversion of communication signals of the higher-order control unit and of internal communication signals of the safety module and for a reception of component measured values from the sensor device connected to the input module and for transferring the component measured values to the safety module as a communication signal via the internal communication system of the lower-order control unit.

2. The automation system according to claim 1 , wherein the at least one safety module comprises:
a communication interface designed for a signal-transmitting connection to a communication system;
an output interface designed for a signal-transmitting connection to at least one user which can be fitted downstream to the safety module; and
a processing device connected to the communication interface and the output interface and designed to process communication signals from the communication interface and to provide output signals to the output interface, wherein the processing device is designed for a detection of an actual component behavior, using a control command contained in a communication signal and a component measured value contained in a communication signal, and for a comparison of a presettable component behavior to the actual component behavior as well as for a provision of a safety-oriented output signal to the output interface at a presettable divergence between the presettable component behavior and the actual component behavior.

3. The automation system according to claim 2 , wherein the processing device is designed for a provision of a communication signal to the communication interface in presence of a presettable divergence between the presettable component behavior and the actual component behavior.

4. The automation system according to claim 2 , wherein the processing device is designed for assigning the control command contained in the communication signal to the component measured value contained in the communication signal, using a parameter from a communication signal.

5. A method for operating a safety module in an automation system, the method comprising:
providing a communication signal from a higher-order control unit to a bus node, wherein the communication signal comprises at least one parameter describing a link between an input of an input module and an actuator, the link determining a signal flow;
reading-out and storage of the at least one parameter in the bus node, whereby the bus node receives the information which sensor signal received from an input module or input/output module is to be transferred to the safety module as the communication signal;
transferring of the at least one parameter to a safety module assigned to the bus node which is capable of providing output signals for activating the actuator, whereby the safety module receives the information which link is required between a control signal arriving in the subsequent normal operation of the automation system and a component measured value provided as the communication signal; and
processing of the parameter in a processing device of the safety module in order to establish a communication link between an input of an input module, the bus node, the safety module and the actuator which is connected to the safety module.

6. The method according to claim 5 wherein an input signal arriving at the input of the input module is made available to the bus node and wherein the input signal is made available by the bus node to the safety module as a communication signal.

7. The method according to claim 6 wherein the higher-order control unit provides at least one control command to the bus node which is transferred by the bus node to the safety module as a communication signal and which is converted by the processing device of the safety module into an output signal for the activation of at least one actuator, wherein the processing device performs a determination of an actual component behaviour using the control command and a signal course of the input signal made available by the input module via the bus node, and further performs a comparison between a presettable component behaviour and the actual component behaviour, and provides a safety-oriented output signal to the output interface if there is a divergence between the presettable component behaviour and the actual component behaviour.

8. The method according to claim 7 , wherein the processing device provides a safety-oriented communication signal to the communication interface for transfer to the safety control unit.

9. The method according to claim 7 , wherein the presettable component behaviour is determined by a safety time interval and wherein the actual component behaviour is determined using a time interval which is measured from the provision of the output signal by the processing device to the output interface for activating the safety-oriented actuator controller to an arrival of a presettable input signal at the processing device.

10. The method according to claim 7 , wherein the safety module makes available a diagnostic signal to the communication interface if there is a divergence between the actual component behaviour and a presettable component behaviour.

Assignees

• Festo Se & Co Kg

Inventors

• Gehrke Martin
• Kalberer Roland
• Forcht Ralf

Classifications

• F15B20/00

  Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems · CPC title

• F15B13/085

  Electrical controllers · CPC title

• F15B2211/8755

  Emergency shut-down · CPC title

• F15B13/0867

  Data bus systems · CPC title

• F15B2211/6336

  representing a state of the output member, e.g. position, speed or acceleration · CPC title