A programmable (logic) controller especially suited for automation applications of highest safety criticality, i.e., on Safety Integrity Level 4, is presented. Its main characteristics are input conditioning by low resolution analogue-to-digital converters and inference by look-up in cause/effect tables or rule set tables. This programmable electronic system consists of a few industry standard components, only. Thus, it is reliable, safe, verifiable, cheap and small. Owing to the simplicity of both its hardware and software, safety licensing of the controller is facilitated. With regard to software, this can easily be carried out by inspection of the table content. As a result, the approach is particularly cost effective with respect to software development. The controller is very fast, with its speed mainly determined by the table access time, and works almost jitter free. Operating in a strictly cyclic fashion, the controller exhibits fully predictable real time behaviour. Its hardware operation is supervised by a fail safe logic immediately initiating an emergency shut-down in case of a malfunction. Copyright (C) 2001 IFAC.
