IEC 61504:2017是对IEC 61559-1的补充，包括IEC 61559-1范围之外的对安全重要的辐射监测功能。它适用于在核设施中实现或维护辐射防护方面具有直接作用的集中系统。这些系统执行以下功能: -工厂排放物的辐射防护；控制功能的联锁，以防止或减轻放射性物质的意外释放； -辐射和环境监测职能，以支持对事故的监测和反应； -向过程控制或安全系统提供用于控制或联锁功能的信息。与上一版相比，此新版本包括以下重大技术变更: -它补充了IEC 61559-1并集成了IEC 61559-2； -它描述了功能的集成，包括其他IEC标准涵盖的设备。

IEC 61504:2017 supplements IEC 61559-1 and includes radiation monitoring functions important to safety that are outside the scope of IEC 61559-1. It applies to centralized systems having a direct role in the achievement or maintenance of radiation protection in nuclear facilities. These systems perform functions such as:
- radiation protection of plant discharge; interlock of control functions to prevent or to mitigate accidental release of radioactive material;
- radiation and environmental monitoring functions to support monitoring of and response to accidents;
- provide information to process control or safety systems for use in control or interlock functions. This new edition includes the following significant technical changes with respect to the previous edition:
- it supplements IEC 61559-1 and integrates IEC 61559-2;
- it describes integration of functions including equipment covered by other IEC standards.