What is PD IEC TR 61131-4 - User guidelines on programmable controllers about?
PD IEC TR 61131-4 is the fourth part of the multiple series that introduce the end-users of Programmable Controller (PLC) to the IEC 61131 series and assists the end-users in their selection and specification of their PLC equipment according to the IEC 61131 series. PD IEC/TR 61908 user guideline has as its main audience PLC end-users.
Who is PD IEC TR 61131-4 - User guidelines on programmable controllers for?
PD IEC TR 61131-4 on user guidelines on programmable controllers  is useful for:
- Software programmers/engineers  
- The IT industries 
- Users of programmable controller systems 
- Implementers of programming and debugging tools 
- Programming language implementers 
Why should you use PD IEC TR 61131-4 - User guidelines on programmable controllers?
A programmable controller is a digitally operating electronic system, designed for use in an industrial environment, which uses a programmable memory for the internal storage of user-oriented instructions to implement specific functions (such as logic, sequencing, timing, counting, and arithmetic) to control, through digital or analogue inputs and outputs, various types of machines or processes.
To avoid and restrict dangerous failures of the functional-safety-related system, PD IEC TR 61131-4 aids you with the standards on programmable controllers and associated peripherals, as well as the PLC application analysis and specification to perform safety functions. The ability of an SRS to carry out the duties required to achieve or maintain a safe state for the Equipment Under Control (EUC) is also specified in PD IEC TR 61131-4.
Overall, PD IEC TR 61131-4 gives guidance to assist you in facilitating communication in accordance with the IEC 61131 series of specifications.
What’s changed since the last update?
PD IEC TR 61131-4:2004 cancels and replaces the first edition published in 1995. It constitutes a technical revision.
This second edition of IEC 61131-4 differs extensively from the first edition. The first edition, IEC 61131-4:1995, initiated some twenty years ago, was mainly a tutorial in nature. The present revision aims to provide an engineering overview of the IEC 61131 series for the end-user of PLC equipment who may not be expected to delve into the details of the extensive product standard that is IEC 61131.
