State machines date back many years, but only more recently have been applied to industrial programming. State machines are a very powerful method for expressing a system whose behavior depends on past history, such as any logic with:
Practitioner-oriented but formally correct professional book written by computer experts for industrial engineers Describes the standard IEC 1131-3 for programming systems, which made PLC the most powerful technology in contemporary production automation
Perfect for the industrial field, CoDeSys is the software for programming according to the IEC 61131-3 standard. In fact, it allows you to choose among five programming languages to develop your applications. Specifically: IL (Istruction list), LD (Ladder Diagram, linguaggio a contatti), ST (Structured Text), FBD (Function Block Diagram) and SFC (Sequential Functional Chart).
The aim is to define a set of rules and to provide PLCopen proposals on how these rules can be used. Nowadays large automation companies have their own rules but many mid-size companies or IEC 61131-3 beginners are very interested in using PLCopen guidelines. Such guidelines will have a great impact in expanding IEC 61131-3 further in the world.
These rules will be very useful to train users and can be a good basis for universities to help them teach IEC 61131-3 programming more efficiently. Read more on PLCopen Software Construction Guidelines
CODESYSÂ is an independent development environment for programming controller applications according to the IEC 61131-3 industrial programming standard. It is the basis of a comprehensive suite that covers the entire software side of automation. Modern editors, debugging functions, and integrated compilers allow for an easy handling of all engineering tasks. The CODESYS Development System can easily be extended to suit individual requirements. In order to be able to execute automation applications, the CODESYS Control runtime system must be ported to the target device by the means of toolkits. With the integrated visualization, users can create and animate professional user interfaces for testing, commissioning, and servicing machines and plants. Different visualization runtime clients are available.
However, we take for granted the healthy and prospering market for PLC programming talent. Why are the controls engineers that run PLCs and keep every industrial plant in the world running able to freely transfer their skills from say, a Rockwell Micrologix 1400 to a Siemens S7-1200? It is all thanks to one manufacturing standard.
National Instruments (NI) seems to be edging closer to compliance with the IEC 61131-3 programming standard by incorporating what it describes as ÂNew LabView function blocks for familiar functions based on IEC 61131-3Â into LabView 8.6, the latest version of the graphical programming software released to coincide with this monthÂs NI Week annual user conference in Austin, Texas. Although LabView has always had its adherents in the industrial automation world, until recently NI has not seen compliance with IEC 61131-3 as necessary or even desirable. That position now seems to be under review however. As U.K. and Ireland marketing manager Ian Bell explained at the London preview of the new release in late July, ÂAdoption of our package has got to the level where 61131 compliance has become important.Â
Did that imply that LabView actually was being excluded from some industrial applications simply because of an inability to tick the IEC 61131-3 compliance box? ÂI wouldnÂt say excluded, but . . . was the enigmatic response.
NI still appears to be holding itself aloof from the general run of industrial applications. However, SCADA and soft logic vendors who may have taken their eye off the ball while they grapple with the implications of MES need to be aware of the potential threat posed by an eventually fully IEC 61131-compliant LabView, particularly in applications lying at the interface between development and production and between scientific data acquisition and industrial automation. Recent LabView successes range from its inclusion in the newly introduced LEGO Education ÂWeDo product targeting seven to eleven year olds to the CERN Large Hadron Collider, described as Âthe most powerful instrument on earth.Â
NI already claims that LabView is Âthe worldÂs most popular data acquisition platform. Its very flexibility and, not least, its name perhaps make it less easy to classify as an industrial automation solution, but its rapidly expanding capabilities, and arguably NIÂs belated recognition of the importance to industrial users of complying with industry-recognized standards, is likely to see OEMs and integrators increasingly turning to LabView to solve complex automation challenges.
The PLCopen (PLCopen.org) organization was founded in 1992 as a not-for-profit industry association of member companies committed to developing open industrial automation software standards to increase functionality while reducing engineering, training, operations, and maintenance costs. PLCopen has a vendor certification program, and certified products are listed on the organization website. PLCopen is headquartered in The Netherlands, with regional representatives in North America (www.plcopen-na.org), Japan (www.plcopen-japan.jp), and China (www.plcopen.org.cn). The website describes certifications of IEC 61131-3 compliant programming systems.
Internet of Things (IoT) concepts are driving computing into edge devices, such as sensors and powerful single-chip computers, and IEC 61131-3 is suited for these embedded applications. It provides the programming standard to support implementations of IoT technology for industrial controls in automation.
Ladder Diagram (LD) has its roots in the U.S. and is based on the graphical presentation of Relay Ladder Logic. Relay Ladder Logic is acknowledged to be the first graphical industrial automation programming method that significantly improved productivity.
IEC 61131-3 and PLCopen standards lower the life-cycle cost of automation and control implementations with a design philosophy enabled by the standards. Engineers that leverage the standards have a great advantage when programming applications that make all aspects of the control and automation life cycle more efficient.
Ladder logic is favored by manufacturers in discrete industries, but as technology and automation evolve, its usefulness compared to other IEC 61131-3 programming languages and PC programming depends on application complexity and other factors.
Ladder logic, the primary programmable logic controller (PLC) programming language, is simple and represented graphically as relay contacts and coils. The question is, though: How well can ladder logic serve the complex automation needs of the present and future compared to other programming languages? The answer is more complicated than just contacts and coils.
When PLCs arrived, they promised a lot of benefits to automation, but nobody knew how to program them. Then someone got the idea to program the PLCs with the ladder diagram, which allowed the industry to repurpose existing skill sets for programming. Engineers and electricians could read and understand the programming, and automation design could largely follow the same patterns it had with relays.
Today, the processor chip inside a PLC can do more than relays at a much lower cost of space, money, and implementation time. In turn, the programming languages used in PLCs have grown to reflect the increased capabilities. Ladder logic does a lot more today than it used to. PLCs commonly are used for analog control, tracking part data (barcodes, test results, calibration), controlling motion, and a plethora of other tasks-and ladder logic is still the dominant language. As the language has evolved and automation has become more complex, programming PLCs has become a more specialized occupation. Ladder logic is no longer such a convenient language for electricians to read and maintain, nor is it a broadly existing skill in the incoming workforce.
Industrial programming is influenced by two communities: the standard IEC 61131-3, the industrial control programming standard from the International Electrotechnical Commission; and PC programming. These languages usually are seen as complementary to ladder logic, rather than directly opposed.
To take advantage of this new programming option, current groov EPIC owners can simply install a free upgrade. As with all quarterly upgrades to groov EPIC since its introduction in February2018, this upgrade requires only a software download. Unlike all other industrial automation products and platforms, groov EPIC is improved quarterly based on user feedback, with no needto replace existing hardware. These software upgrades provide significant performance improvements and protect user hardware investments, all at little or no cost. The groov EPIC systemcan change with you as your application grows or changes.
Opto 22 designs and manufactures industrial control products and Internet of Things platforms that bridge the gap between information technology (IT) and operations technology (OT). Based on a core design philosophy of leveraging open, standards-based technology, Opto 22 products are deployed worldwide in industrial automation, process control, building automation,industrial refrigeration, remote monitoring, and data acquisition applications. Designed and manufactured in the U.S.A., Opto 22 products have a worldwide reputation for ease-of-use, innovation, quality, and reliability. For over 40 years OEMs, machine builders, automation end-users, and information technology and operations personnel have and continue to trust Opto 22 to deliver high-quality products with superior reliability. The company was founded in 1974 and is privately held in Temecula, California, U.S.A. Opto 22 products are available through a global network of distributors and system integrators. For more information, contact Opto 22 headquarters at +1-951-695-3000 or visit www.opto22.com. Follow us on Twitter, Facebook, LinkedIn, YouTube.
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