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PLC

​What is a PLC?

What is a PLC? A PLC, or Programmable Logic Controller, is a computer built to function reliably under the tough conditions of industrial environments like extreme temperatures or dusty areas. It automates processes in industries, including manufacturing and wastewater treatment.

PLCs share many features of the personal computer you have at home. They both have a power supply, a CPU (Central Processing Unit), inputs and outputs (I/O), memory, and operating software (although it’s a different operating software).

The biggest differences are that a PLC can perform discrete and continuous functions that a PC cannot do, and a PLC is much better suited to rough industrial environments. A PLC can be thought of as a ‘ruggedized’ digital computer that manages the electromechanical processes of an industrial environment.

PLCs play a crucial role in the automation field, forming part of a larger SCADA system. A PLC can be programmed according to the operational requirements of the process. In the manufacturing industry, reprogramming will be needed due to the change in the nature of production. To overcome this difficulty, PLC-based control systems were introduced. We’ll first discuss PLC basics before looking at the various applications of PLCs.

If you want to learn how to programme PLCs, you should check out some of the different online PLC training courses. These courses can help jump-start your career in control engineering.

​Grenoside is a suburb of Sheffield, South Yorkshire, England. The suburb falls within the West Ecclesfield ward of the city.

History

The Angel, Main Street, Grenoside

The name Grenoside is derived from the language of the Anglo-Saxons. The name Grenoside, which was first recorded in the thirteenth century as Gravenhou, is made up of the different elements. Gren from the Old English (Anglo-Saxon) graefan meaning a quarry. ‘o’ from the Old Norse haugr meaning hill and the modern word side, altogether meaning a quarried hillside.[1]

In Norman and later documents, it is named as Gravenho (1199) and Gravenhowe (1332). This name is made from the Saxon word elements of Grave meaning "to dig" and How meaning Hollow. In this sense the meaning of Gravenhowe would be "Quarried Hollows" or "Quarried Hills"[citation needed] and indicates that stone has been quarried in Grenoside from the ninth century[citation needed] up to 1938 when the last quarry on Norfolk Hill closed. Other spellings of the name are Granenhou (1267), Granow (1450), Graynau (1534), Grenoside (1759), Greenaside (1772) and Grinaside (1831).

Stone quarrying was a major industry in Grenoside from a very early date until it ceased in 1939. The stone quarried in Grenoside varied in quality and was put to several uses. The finer grained, hard stones were much in demand as grindstones for the cutlery trade and for fine fettling and finishing in iron foundries. Coarse grained stone was used for furnace lining and from these were hewn the stone boxes used in the cementation process of steelmaking. In 1860, the following are named as quarry owners in Grenoside – Thomas Beever, George Broadhead, George Firth, Thomas Lint, Joseph Swift and Charles Uttley.

By the beginning of the seventeenth century, several village people were named in connection with the making of cutlery. William Smith, a yeoman of Grenoside, who died "of great age" in 1627 had taken out a cutlers mark in 1614. His son, Henry, was a member of the Cutler's Company in 1629. The manufacture of cutlery was restricted to those who had served an apprenticeship in the trade; an apprentice served seven or ten years without pay. The restriction was closely controlled by the Company of Cutlers in Hallamshire from 1624. As a result, many small nailmaking businesses were set up which was not so tightly controlled. As late as 1860, three nailmakers are listed as living and working in Grenoside.

Grenoside Sword Dance

The Grenoside Sword Dance forms an important mid-winter ritual for the village and can be traced back to the 1750s.[2] It is traditionally performed on Boxing Day morning in Main Street.

There is an Anglican church situated on Main Street, St Mark's Church, Grenoside, a Methodist church on Norfolk Hill and St Thomas More Catholic Primary School, on Creswick Lane. The Primary School, originally on the north side of Norfolk Hill, relocated to a new building to the south of the road in 2006. The former infant building on the north side of the road is now semi-derelict. Grenoside's new crematorium, built in 1999 on Skew Hill Lane, was formerly a munitions scrap yard.

Part of Greno Woods is a nature reserve managed by The Wildlife Trust for Sheffield and Rotherham.[3]

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