NBN EN 61131-1 : 2004

INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Functional characteristics
  4.1 Basic functional structure of a programmable controller
      system
  4.2 Characteristics of the CPU function
  4.3 Characteristics of the interface function to sensors
      and actuators
  4.4 Characteristics of the communication function
  4.5 Characteristics of the human-machine interface (HMI)
      function
  4.6 Characteristics of the programming, debugging, monitoring,
      testing and documentation functions
  4.7 Characteristics of the power-supply functions
5 Availability and reliability
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications
Bibliography

Applies to programmable controllers (PLC) and their associated peripherals such as programming and debugging tools (PADTs), human-machine interfaces (HMIs), etc. which have as their intended use the control and command of machines and industrial processes.