Fuji Electric is providing “SPS” as a software PLC (programmable controller) for the “MICREX-SX” series of integrated controllers. The SPS is a PLC operated on Windows NT*1, a general-purpose OS (operating system) for the PC (personal computer), and is well received because it shares the same programming language and development environment as the hardware PLC for the MICREX-SX. Realization of ...

With the discovery of the Stuxnet attack, increasing attention is being paid to the potential for malware to target Programmable Logic Controllers (PLCs). Despite much speculation about threats from PLC malware, the popular opinion is that automated attacks against PLCs are not practical without having a priori knowledge of the target physical process. In this paper, we explore the problem of d...

Programmable logic controller is still the main device used for control of productive systems, which can be approached as discrete event dynamic systems. For programming these controllers, five languages were standardized by IEC 61131, and the LD (ladder diagram) language is distinguished among the others, i.e., it has been widely applied in productive systems, even with studies that confirm th...

This paper presents a preliminary study of an approach that models programmable logic controllers (PLCs) for their effective deployment in industrial control processes. A working model is developed for automatic allocation of PLCs and also a formal verification of Ladder Diagram representations of control processes using the Symbolic Model Verifier (SMV) tool. Automatic resource allocation is a...

Programmable Logic Controllers are industrial digital computers used as automation controllers in manufacturing processes. The Ladder language is a programming to develop software for such controllers. In this work, we consider the description of expected behaviour program under form timing chart, describing scenario execution. Our aim prove that given conforms temporal by chart. approach amoun...

The Allen-Bradley ControlLogix [1] line of programmable logic controllers (PLCs) offers several interfaces: Ethernet, ControlNet, DeviceNet, RS-232 and others. The ControlLogix Ethernet interface module 1756-ENET uses EtherNet/IP, the ControlNet protocol [2], encapsulated in Ethernet packages, with specific service codes [3]. A driver for the Experimental Physics and Industrial Control System (...

In control engineering models of the controlled systems are the basis for controller synthesis as well as for analytical or simulative examination of open or closed-loop behaviour. This model-based methodology is being transferred into automation engineering by means of a development environment for the programming of logical controllers. Petri net models of the controlled system allow an autom...

With the rising cost of SoC development and the shorter time-to-market, the demand for postsilicon programmability has been increasing. Recently, programmable accelerators have attracted more attention as an enabling solution for post-silicon engineering change. However, programmable accelerators suffer from low energy efficiency mainly due to their extensive use of memories. This paper first p...

The implementation of a low-cost FATEK PLC-based three-floor lift system is described in this study. Elevator systems are critical for vertical mobility buildings, and their control methods have been revolutionized by the use programmable logic controllers (PLCs). To motion lift, we DC geared motor. In example, push buttons used to direct elevator desired floor. scenario, ladder diagram program...

new types of sophisticated field-programmable devices (FPDs) has dramatically changed the process of designing digital hardware. Unlike previous generations of hardware technology in which board level designs included large numbers of SSI (small-scale integration) chips containing basic gates, virtually every digital design produced today consists mostly of high-density devices. This is true no...