ICS 25.040.40; 35.240.50                         ETD 18

Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 2) (Second Revision) which is identical with IEC 61131-2 : 2017 ‘Industrialprocess measurement and control - Programmable controllers - Part 2: Equipment requirements and tests’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on recommendation of the Industrial Process Measurement and Control Sectional Committee and approval of the Electrotechnical Division Council.

This Indian Standard was first published in 1992 which was identical to IEC Publication 1131-2 (1992). IS/IEC 1131 (Part 2) : 1992 was revised as IS 14254 (Part 2) to bring it in line with IEC 61131-2 : 2003.

The second revision of this standard has been undertaken to align it with the latest version of IEC 61131-2 : 2017.

The major changes in this revision are as follows:

a) removal of safety requirements and instead pointing to IEC 61010-2-201;

b) addition of negative logic digital inputs and outputs;

c) addition of Type 3-d digital input;

d) addition of 2,7 GHz to 6 GHz requirement for Radio-frequency electro-magnetic amplitude modulated immunity;

e) clarification of temperature testing;

f) clarification of type testing;

g) deprecation of certain technologies;

h) general update of multiple aspects of functionality and EMC; and

j) reorganization of clauses to associate requirements and verifications more closely.