![]() ![]() This means when the need does arise to understand how the automation system functions, technicians must often dive through undocumented program code and out-of-date drawings. For many end users, PLCs are mysterious boxes that run so well they may not even have the latest backup programs stored in their possession, or the ability to upload, download or troubleshoot the code. Maintaining, let alone specifying, PLC programming standards poses challenges. ![]() Smarter coding practices accounted for handling each instrument or process element uniformly from the standpoint of controls, interlocks and alarms. Newer coding methodologies eased scalability and consistency in coding efforts. Tag-based programming evolved into smarter structures such as user-defined data and program blocks. Address-based programming evolved into tag-based programming. PLC coding practices have evolved throughout the years with the development of the IEC 61131 standards for PLC languages. ![]()
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