Motohiko Okabe

Development of processor directly executing IEC 61131-3 language

Language processor of unified controller nv series which is PLC (programmable logic controller), and is the DCS (distributed control system) controller is developed. The controller nv series has the features that is high performance and high reliability. Language processor qualified the features with hardware logic execution and redundant circuit architecture. Controllerpsilas application program for PLC or DCS is described by international standard IEC 61131-3 programming language. Program high operation performance is powered by language processor, which is designed to execute IEC 61131-3 language instructions directly with hardware logic, then the execution time of the sequence instructions can be set 20 ns (1/2 compared with our company late product) and the control cycle time is from 0.5 ms or more. Controller high reliability has been achieved by the card redundant configuration and the ECC (error check and correct) circuit applied to internal memories.