From OpenSCADAWiki
Hard-programmable PLC are typically based on a single-crystal microcomputer or chips of programmable logic. Program of such controllers is flashed one-time, sometime providing the software parametrization, or formed with a specialized environment endowed with functions of binary firmware compilation of the runtime with the user program, such as ISaGRAF and LabView. As an example of such PLC can be MOD of the Advantech company.