Matching Discrete Signals for Hardware-in-the-Loop-Testing of PLCs

Thönnessen, David; Rakel, Stefan; Reinker, Niklas; Kowalewski, Stefan

doi:10.1016/j.ifacol.2018.06.267

Cited by 2 publications

(3 citation statements)

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“…We use the HiL testing framework as presented in [5], [9], [10] to apply test cases to a SUT. HiL testing allows incorporating the control hardware into the testing process, which is beneficial for safety testing as it incorporates more components of the control system than other approaches like Model-in-the-Loop or Software-in-the-Loop.…”

Section: Test Case Executionmentioning

confidence: 99%

“…We realized this constraint by using a signal change tolerance of 800 ms of the HiL testing framework as defined in [9]. In simple terms, this tolerance means that a signal must change to the value of the reference signal within 800 ms.…”

Section: This Means That Pressing the Emergency Button On The Rightmentioning

confidence: 99%

“…Test results are evaluated using the framework previously described in [5]. In this framework, test cases are evaluated using an oracle, which carries out the evaluation following an Input-Output Conformance (IOCO)-based approach [8], that is, having acceptance criteria that calculate reference signals for a SUT and a so-called supervisor that compares these signals with the actual signals of the SUT [9], [10]. In related work, we apply our approach to on-thefly IOCO testing of Safety PLC code [11] using Supervisory Control Theory [12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Testing Safety PLCs Using QuickCheck

Thönnessen

Smallbone

Fabian

et al. 2019

2019 IEEE 15th International Conference on Automation Science and Engineering (CASE)

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The testing of safety-related industrial systems is usually carried out by means of checklists. A tester has a list of scenarios that he or she manually applies to the system to check whether the system behaves according to its specification. However, operators behave unpredictably. Their behavior may not be covered by the set of scenarios tested and may lead to dangerous situations. To avoid this, randomized test case generation can be useful as it allows for unanticipated scenarios. The presented framework uses a tool for randomized test case generation, QuickCheck, to trigger event sequences that are then applied to a Safety Programmable Logic Controller (Safety PLC). Experiments show that this concept is capable of finding errors in safety code or increasing the tester's confidence in the correctness of the code by exhibiting a large number of passing test cases. While this concept proves to be powerful, it does not require much effort from the tester as the execution of test cases is done without user interaction.

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Section: Test Case Executionmentioning

confidence: 99%

Section: This Means That Pressing the Emergency Button On The Rightmentioning

confidence: 99%