IEC 62138:2018 RLV包含国际标准及其红线版本。红线版本只有英文版本。Redline版本为您提供了一种快速简单的方法来比较该标准与其前一版本之间的所有变化。红线版本不是IEC官方标准，只有标准的当前版本才被视为官方文件。 IEC 62138:2018规定了执行IEC 61226定义的安全类别B或C功能的基于计算机的仪表和控制(I&C)系统的软件要求。它补充了IEC 60880，IEC 60880规定了执行A类安全功能的基于计算机的I&C系统的软件要求。它与IEC 61513一致并互补。非特定于软件的要求推迟到IEC 61513。与上一版相比，此新版本包括以下重大技术变更: -使标准与自第一版以来发布或修订的标准一致，特别是IEC 61513、IEC 60880、IEC 62645和IEC 62671； -合并两个条款，以避免案文重复； -引入符合IEC 61513的可追溯性要求； -引入新的附件。

IEC 62138:2018 RLV contains the International Standard and its Redline version. The Redline version is available in English only. The Redline version provides you with a quick and easy way to compare all the changes between this standard and its previous edition. The Redline version is not an official IEC Standard, only the current version of the standard is to be considered the official document.

IEC 62138:2018 specifies requirements for the software of computer-based instrumentation and control (I&C) systems performing functions of safety category B or C as defined by IEC 61226. It complements IEC 60880 which provides requirements for the software of computer-based I&C systems performing functions of safety category A. It is consistent with, and complementary to, IEC 61513. Requirements that are not specific to software are deferred to IEC 61513. This new edition includes the following significant technical changes with respect to the previous edition:
- align the standard with standards published or revised since the first edition, in particular IEC 61513, IEC 60880, IEC 62645 and IEC 62671;
- merge two clauses in order to avoid repetitions of text;
- introduce requirements on traceability in consistency with IEC 61513;
- introduce new annexes.