IEC 61784-5-21:20 18（E）规定了CPF 21（FL-net）的安装配置文件。 本文包含许多相关文件，涵盖了与IEC 61918一起使用的通信配置文件。 此处包含的安装配置文件通过说明IEC 61918的哪些要求完全适用，并在必要时通过补充、修改或替换其他要求来提供特定通信配置文件系列（CPF）的通信配置文件（CP）的安装配置文件。附件A中规定了安装配置文件。本附件应与IEC 61918一起阅读。

IEC 61784-5-21:2018(E) specifies the installation profiles for CPF 21 (FL-net).
This contribution contains a number of related files covering the communication profiles to be used with IEC 61918.
This installation profile documents contained herewith provide the installation profiles of the communication profiles (CP) of a specific communication profile family (CPF) by stating which requirements of IEC 61918 fully apply and, where necessary, by supplementing, modifying, or replacing the other requirements. The installation profiles are specified in Annex A. This annex is read in conjunction with IEC 61918.