New Conception of Safety Logic Microcontroller

2012 ◽  
Vol 58 (4) ◽  
pp. 419-424
Author(s):  
Marek Sałamaj
Keyword(s):  
Control Systems ◽  
Systems Development ◽  
Critical Systems ◽  
New Approach ◽  
Decision Control ◽  
Hardware Realization ◽  
Safety And Reliability ◽  
Safety Critical Systems ◽  
Safety Systems ◽  
Technical Solutions

Abstract In this paper a new conception of safety logic microcontroller (BML) is described, together with its physical hardware realization. The unit has various mechanisms which increase its safety and reliability, so that it can satisfy rigorous requirements of safety-critical systems. Thus, the BML unit uses some untypical and innovative technical solutions. The new approach to safety systems development allowed to propose a new conception. The paper describes also physical realization of small multiprocessor BML unit for management of decision-control systems adopted to critical usage.

scholarly journals Hidden Security Breaches in Automatic Control of Technological Processes

2021 ◽  
Vol 25 (2) ◽  
pp. 31-39
Author(s):  
Marcin Szuster ◽  
Bartłomiej Kozioł
Keyword(s):  
Control Systems ◽  
Machine Tools ◽  
Functional Safety ◽  
Validation Process ◽  
New Approach ◽  
Industrial Plants ◽  
Security Breaches ◽  
Twin Model ◽  
Sequence Of Events ◽  
Safety Systems

The progressing automation and robotization in the industrial plants as well as the increasing complexity of the control systems of integrated machines make it necessary to constantly improve the functional safety of machines through the correct validation of safety systems. Despite the validation process carried out, the potential software errors may reveal during the usage of the machine as hidden security breaches. The article presents examples of security breaches of real machine tools and attempts to implement solutions of automated mechanisms for detecting security problems. Another aspect of the article is the new approach for detecting hidden security breaches. Using the „digital twin” model of the machine, a program that generates a sequence of events for testing control systems, and the use of a virtual reality (visual verification of the safety programs), it is possible to maximize the functional safety functions of the machine.

Reliability Assessment of Control Systems

2011 ◽  
Vol 467-469 ◽  
pp. 174-180
Author(s):  
Salvatore Distefano
Keyword(s):  
Control System ◽  
Control Systems ◽  
Reliability Assessment ◽  
Critical Systems ◽  
Monitoring And Control ◽  
Dynamic Reliability ◽  
Reliability Block Diagrams ◽  
Safety Critical Systems ◽  
The Right ◽  
And Control

Actually modern systems have to ensure higher and higher operating standards, thus including monitoring and control subsystems for their achievement. In safety critical systems control is a crucial task in order to satisfy strict reliability requirements. But it is also necessary that the control system is itself reliable. As a consequence, adequate techniques are necessary in order to perform reliability evaluation of both the controlled and the control systems. Techniques that therefore should avoid over-simplistic assumptions and/or approximations that, for example, are usually introduced when dependencies, interferences and other dynamic reliability aspects are not taken into the right consideration. In this paper, a technique for carefully evaluating the reliability of such systems, also considering dynamic aspects and behaviors, is proposed. Firstly the technique is detailed through the specification of the dynamic reliability block diagrams notation, and therefore in order to demonstrate its effectiveness, it is applied to an example of a computing-based control system taken from literature, thus providing guidelines for the reliability representation and evaluation through DRBD.

Sign in / Sign up

Export Citation Format

Share Document