The paper presents a review of methods of implementing timers in programmable logic controllers, along with a discussion of the timer properties. The authors focus on software implementations, as this approach has dom...
详细信息
Like in other industry sectors, in the process industry tasks are performed in a fully or partially automated manner. In the market there are many programmable logic controllers (SPS), sensors and components of differ...
详细信息
Like in other industry sectors, in the process industry tasks are performed in a fully or partially automated manner. In the market there are many programmable logic controllers (SPS), sensors and components of different manufacturers, which are used in production plants. With the O-PAS Standard, a non-proprietary reference architecture is available, which enables the design of scalable, interoperable and safe process automation systems.
Induction motors are widely used in industries as well as some home appliances. It is therefore necessary to provide protection from likely sources of faults such as overcurrent, overvoltage, under voltage and high te...
详细信息
In this paper, an automated Lab-scaled Valve control system for Water Distribution System (WDS) that mimics real-world conditions is presented. The system utilises ThingsBoard software as the Supervisory Control and D...
详细信息
Reactor Control Division of BARC has developed a programmablelogic Controller (known as TPLC-32) for development of safety C&I applications in nuclear reactors. It uses an indigenously developed software tool &qu...
详细信息
ISBN:
(纸本)9789819730865
Reactor Control Division of BARC has developed a programmablelogic Controller (known as TPLC-32) for development of safety C&I applications in nuclear reactors. It uses an indigenously developed software tool "Application Development Environment (ADE)" that facilitates graphical programming of application logic using Function Block Diagram (FBD) language. The application developed using ADE undergo rigorous syntax and semantic checks. This is required in order to ensure that there is no ambiguity in the logic during run time execution. Few of the important checks incorporated in ADE are analysing the application for proper initialization, single static assignment and causality analysis. In this paper we focus on the technique used for ensuring the causality of application. An application is said to be causal if any output at a given cycle can be computed purely based on the present and past inputs only. Causality check requires analysing the dependency between the output variables in the application, such that no output depends directly or indirectly on itself. Application logic in ADE consist of network of various function blocks. The basic approach to find whether the application is causal is to check that no loop exists (no self-dependency) in the application. This can be achieved by applying suitable loop detection algorithm. However, naively applying such an algorithm on each block may take inordinately longer time, especially when there are very large number of function blocks present in the application. In order to reduce the analysis time a new methodology was devised in which the list of blocks undergoing loop detection was shortened. This shortened list was derived by subtracting blocks which are not part of any loop, from the total blocks present in the application. If the shortened list is empty, then application is declared as causal and no further analysis is required to be carried out. If shorted list is non-empty, then loop detection algorithm is ap
Load shedding occurs when electricity generation cannot keep up with the expanding demand and power shortages. With the surge in power needs, power loads have been continuously rising both during off-peak hours and ov...
详细信息
programmable logic controllers have the difficult task of interfacing with dozens of input and output devices spread out across an industrial or manufacturing facility. The modularity of PLCs and the hazardous nature ...
详细信息
The article presents results of the research on design of novel, low-cost and wide-applicable solution to support testing and simulation of the industrial automation and control systems, implemented on the platform of...
详细信息
In this paper, a comparison of communication solutions between a programmable controller and industrial controller devices is presented. The study was conducted through a project in which is investigated and developed...
详细信息
The increasing reliance on solar power systems as a sustainable and renewable energy source necessitates maintaining optimal performance, which can be hindered by dust and debris accumulation on solar panels. This res...
详细信息
暂无评论