Firstly, bugs are cheaper and easier to fix during development rather than once the software has been deployed, thus it is worth taking the time at this point. Using static analysis as a preventative measure at the development stage can save money down the line. Static analysis is especially useful for these regulated industries not just for confirming that the code is secure, but also because other information from the analysis can be used to support compliance documentation that will be created for the certification bodies. In these environments, the systems need to be as robust as possible to prevent any potentially dangerous issues.įurthermore, many of the standards regarding the development of secure code, such as GAMP® 5 for pharmaceutical and IEC 61508 for electronic devices, recommend or require static analysis as a safety measure. This is particularly important for PLC programs since they are often used in safety critical environments. The more complex the code, the less it is secure, therefore it is necessary to make sure that your code is not too complex. Static code analysis can be used to verify the complexity and structure of the code. Furthermore, PLCs have a long useful life, therefore it is important that the quality is good from the beginning to avoid the need for constant maintenance. To check for and fix bugs from an early stage creates a better quality code from the outset, as well as being quicker and cheaper to do at this stage. The use of static analysis during the development process can greatly improve the quality of PLC programs. But what is especially important for industry is the fact that poor quality code could lead to financial losses and time wasted during maintenance or due to the need to make modifications. There are also some IEC standards which cover software quality, such as IEC 25010, which require that programs encompass the properties mentioned above. To put it simply, a high-quality program is easier to maintain, more efficient, more reliable, and easier to read all essential characteristics of software. One of the most important aspects of a PLC program is its quality, since it is a starting point for many other properties, including: maintainability, efficiency, reliability, and readability. So, what are the advantages of static analysis for PLC programming? 1) PLC Programming Quality This white-box testing should take place during the development stage to check for any errors and to ensure that the program is of quality before deployment. ![]() This type of analysis looks at details such as the conformity with a coding standard or set of rules, the syntax of the code and code optimization. Static analysis, or verification testing, is the assessment of the source code in a non-runtime environment. ![]() If static analysis is essential in other domains, then there must be a reason for this. In other domains, such as embedded systems and computer science, static analysis tools are more common and used more intensively. ![]() Yet, the availability and use of static analysis tools in industry for PLC code is limited. Static analysis is just as important as functional analysis when it comes to your PLC programs.
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