Method and system for testing safety automation logic of a manufacturing cell

• US 8,949,480 B2
• Filed: 05/11/2009
• Issued: 02/03/2015
• Est. Priority Date: 05/11/2009
• Status: Expired due to Fees

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Liu, Jing, Yuan, Chengyin, Gu, Fangming, Biller, Stephan R., Wood, Demet C., Aufderheide, Daniel B.
• Primary Examiner(s): Tsai, Henry
• Assistant Examiner(s): Hassan, Aurangzeb
• Application Number:
  US12/463,579
• Publication Number:
  US 20100286797A1
• Time in Patent Office: 2,094 Days
• US Class Current: 710/15
• CPC Class Codes: G05B 9/02 electric
• CPC Class Codes: G06F 11/261 by simulating additional hardware, e.g. fault simulation

Abstract

A method for testing the safety automation logic used in a manufacturing cell includes recording control signals of a safety-related component such as an E-Stop, light curtain, gate lock, or a safety mat using a host machine, and then disconnecting the component from the host machine. The recorded test signals are transmitted to an automation controller in accordance with a test scenario from a test scenario generator module (TSGM) to emulate operation of the component. The automation logic may be certified using the playback of the recorded test signals. A system for testing the safety automation logic includes the controller, host machine, and TSGM. The host machine records the control signals and plays back the test signals on the controller to emulate operation of the component. The automation control logic may be certified using the test signals, e.g., by comparing these to the test specification or standard.

Claims

1. A method for testing the performance of automation logic used in a manufacturing cell, the method comprising:

connecting a first automation component to a host machine through an input/output (I/O) card;

transmitting a predetermined test scenario from a test scenario generator module (TSGM) to the host machine;

generating a set of input control signals using the host machine in response to the test scenario, wherein the input control signals are adapted to control a function of the component based on the test scenario;

transmitting the generated set of input control signals to the first automation component via the I/O card;

recording the behavior of the first automation component as input control signals and a corresponding set of output control signals in a memory location, as a set of recorded test signals;

disconnecting the first automation component from the I/O card;

connecting the I/O card to an automation controller through an I/O block;

automatically transmitting the test scenario and the recorded test signals to the automation controller through the I/O card and the I/O block for playback on the automation controller, thereby emulating an operation of the first automation component; and

testing the performance of the automation logic using the recorded test signals.

2. The method of claim 1, further comprising:

connecting a second automation component to the automation controller;

wherein testing the performance of the automation logic using the recorded test signals from the first automation component further comprises simultaneously testing the performance of the second automation component.

3. The method of claim 2, wherein the second automation component is one of a physical component and a virtual component.

4. The method of claim 1, including a safety logic certifier module (SLCM), the method further comprising:

comparing the test signals to a set of expected values, and then certifying the performance of the safety-related automation logic based on the results of the comparison.

5. The method of claim 1, wherein the test scenario includes at least one of a functionality scenario and a hardware failure scenario.

6. The method of claim 1, wherein recording the input control signals and the output control signals includes recording the input control signals and the output control signals in a memory location that is resident in at least one of:

the host machine and a data logger.

7. The method of claim 1, further comprising:

automatically mixing the predetermined test scenario with the recorded test signals to create different test scenarios.

8. The method of claim 1, including a report generator module (RGM) in communication with the host machine, the method further comprising one of printing a certification report and displaying the certification report on a display screen using the RGM.

9. A method for testing the performance of safety-related automation logic used in a manufacturing cell, the method comprising:

connecting a safety-related component to a host machine through an input/output (I/O) card;

transmitting a set of input control signals to the connected safety-related component via the I/O card;

recording the set of input control signals into, and a corresponding set of feedback or output control signals out of, the connected safety-related component using the host machine, wherein the recorded signals collectively define a set of recorded test signals;

disconnecting the safety-related component from the I/O card;

connecting an automation controller to the host machine through the I/O device and an I/O block;

generating a predetermined test scenario using a test scenario generator module (TSGM); and

transmitting the recorded test signals from the host machine to the automation controller in response to the predetermined test scenario to thereby test the performance of safety-related automation logic using the recorded test signals.

10. The method of claim 9, further comprising:

connecting at least one additional component to the automation controller; and

testing the performance of the automation logic using the recorded test signals while simultaneously testing the performance of the at least one additional component;

wherein the additional component is one of a physical component and a virtual component.

11. The method of claim 9, further comprising transmitting a record of the tested performance to a safety logic certifier module (SLCM), and certifying the performance using the SLCM.

12. The method of claim 9, including a report generator module (RGM) operable for displaying a certification report on a display screen and printing the certification report, wherein certifying the performance includes one of displaying and printing the certification report using the RGM.

13. The method of claim 9, wherein connecting a safety-related component includes connecting at least one of an E-Stop, a light beam, a light curtain, a gate lock, and a safety mat.

14. The method of claim 9, wherein the predetermined test scenario includes a required activation sequence of the recorded test signals.

15. A system for testing safety automation logic used in a manufacturing cell, the system comprising:

an automation controller for controlling the execution of the safety automation logic;

a host machine connected to the automation controller via an input/output (I/O) card and an I/O block; and

a testing scenario generator module (TSGM) in communication with the host machine, and adapted for generating a predetermined test scenario;

wherein the host machine is operable for generating a set of input control signals and transmitting the generated set of input control signals to a safety-related component via the I/O card, recording the set of input control signals and a corresponding output control signals from the connected safety-related component as a set of recorded test signals, and for automatically transmitting the recorded test signals and the predetermined test scenario to the automation controller to thereby test the safety automation logic when the safety-related component is disconnected from the I/O card.

16. The system of claim 15, further comprising a safety logic certifier module (SLCM) in communication with the host machine and adapted for certifying the performance of the safety automation logic.

17. The system of claim 15, further comprising at least one additional component connected to the automation controller, wherein the additional component is one of a physical component and a virtual component.

18. The system of claim 15, wherein the safety-related component is one of:

an E-Stop device, a light beam, a light curtain, a gate lock, and a safety mat.