Apparatus and method for monitoring a safety function of a machine or technical installation

Patent metadata

Field	Value
Publication number	US-11005360-B2
Application number	US-201916692557-A
Country	US
Kind code	B2
Filing date	Nov 22, 2019
Priority date	Nov 26, 2018
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

Apparatus for voltage monitoring of a dual-channel device which implements or monitors a safety function of a machine or technical installation. The apparatus comprises an input for receiving an input voltage, a voltage regulator for generating a defined output voltage, and an output for providing the defined output voltage for the operation of the device. A voltage monitor compares a voltage present at the output with the defined output voltage and switches off the output in case the present voltage at the output deviates from the defined output voltage. A first interface and a second interface connect the voltage regulator to the dual-channels of the device, wherein the first interface and the second interface connect to a first processing channel and a second processing channel of the device separately so that the first processing channel and the second processing channel of the device can detune the voltage regulator independently.

First claim

What is claimed is:

1. An apparatus for voltage monitoring of a device that implements or monitors a safety function of a machine or technical installation and has at least two processing channels, comprising:
an input for receiving an input voltage,
a voltage regulator for generating a defined output voltage from the input voltage,
an output for providing the defined output voltage for operation of the device,
a voltage monitor configured to compare a voltage present at the output with the defined output voltage and to switch off the output in the event that the present voltage deviates from the defined output voltage, and
a first interface and a second interface for connecting the voltage regulator to the at least two processing channels of the device;
wherein the first interface and the second interface are configured to connect to a first processing channel and a second processing channel of the at least two processing channels of the device separately so that the first processing channel and the second processing channel can detune the voltage regulator independently.

2. The apparatus according to claim 1 , wherein switching off the output by the voltage monitor results in execution of the safety function.

3. The apparatus according to claim 1 , wherein the voltage regulator is connected to a resistor network and detuning the voltage regulator includes adjusting the defined output voltage of the voltage regulator via the resistor network.

4. The apparatus according to claim 1 , wherein the apparatus further comprises a first switching element and a second switching element each operable in response to a signal present at the first interface or at the second interface, and wherein detuning of the voltage regulator is achieved by actuation of the first switching element or the second switching element.

5. The apparatus according to claim 4 , wherein actuation of the first switching element and the second switching element changes the voltage present at the output by a defined amount, in particular reduces it.

6. The apparatus according to claim 4 , wherein, when the first switching element is actuated and the second switching element is not actuated, the voltage regulator provides the defined output voltage, when the first switching element and the second switching element are actuated, the voltage regulator provides a defined undervoltage less than the defined output voltage, and, when the first switching element is not actuated and the second switching element is actuated, the voltage regulator provides a defined overvoltage greater than the defined output voltage.

7. The apparatus according to claim 1 , wherein the apparatus further comprises a capacitor disposed at the output and configured to hold the defined output voltage for a defined period of time when the voltage monitor switches off the output.

8. The apparatus according to claim 1 , wherein the apparatus further comprises a third interface and a fourth interface that are separately connectable to the first processing channel and the second processing channel and at which the voltage present at the output is accessible.

9. A device for implementing or monitoring a safety function of a machine or technical installation, in particular a safety switching device, comprising:
a first microcontroller defining a first processing channel,
a second microcontroller defining a second processing channel, and
the apparatus according to claim 1 .

10. The device according to claim 9 , wherein the device further comprises a communication interface, in particular a USB interface, that provides an operating voltage as input voltage.

11. The device according to claim 10 , wherein the implementation or monitoring of the safety function is carried out via the communication interface.

12. The device according to claim 9 , wherein the device is designed as a dongle, in particular as a USB stick, and comprises a housing in which the first microcontroller and the second microcontroller are enclosed.

13. The device according to claim 9 , wherein the device is a monitoring device configured to safeguard the execution of a safety function implemented by user programs on a platform, the monitoring device being connectable to the platform via a first communication interface and executing at least one fail-safe service independently of the platform, via which the monitoring device cooperates with a fail-safe peripheral module, so that the fail-safe peripheral module puts the machine or technical installation into a safe state based on the implemented safety function on the platform and the fail-safe service.

14. A method for monitoring voltage of a device that implements or monitors a safety function of a machine or technical installation and has at least two processing channels, the method comprising the steps:
receiving an input voltage at an input;
generating, by a voltage regulator, a defined output voltage from the input voltage;
providing the defined output voltage at an output for the operation of the device;
comparing a voltage present at the output with the defined output voltage by means of a voltage monitor;
switching off the output if the voltage present at the output deviates from the defined output voltage; and
connecting the voltage regulator to the at least two processing channels of the device via a first interface and a second interface;

wherein the first interface and the second interface connect to a first processing channel and a second processing channel of the at least two processing channels of the device separately so that the first processing channel and the second processing channel can detune the voltage regulator independently.

15. A non-transitory computer readable storage medium encoded with a computer program that, when executed by a computer processor in a device having at least two processing channels for monitoring a safety function of a machine or technical installation, causes the computer processor to execute the steps of the method according to claim 14 .

Assignees

• Pilz Gmbh & Co Kg

Inventors

• Bakovic Daniel
• Schweiker Matthias
• Schoch Uwe
• Pullmann Juergen

Classifications

• H02H1/06

  Arrangements for supplying operative power {(power supply arrangements in general G05F, H02M)} · CPC title

• G05B23/0256 Primary

  injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system · CPC title

• G06F1/28

  Supervision thereof, e.g. detecting power-supply failure by out of limits supervision · CPC title

• H02M1/36 Primary

  Means for starting or stopping converters · CPC title

• G01R19/16528 Primary

  using digital techniques or performing arithmetic operations (using digital techniques to measure a voltage or a current, see G01R19/25) · CPC title