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12 电子设备12.1 概述 本章适用于所有型式的电子设备,包括可编程序电子设备、组件、印刷电路板、器件和元件。12.2 基本要求12.2.1 输入和输出 应提供数字输入和输出的状态指示。12.2.2电子控制设备 电子控制设备(如数控和可编程序控制器)应接受机械的电源供电。电源应由专用或公用变压器引出。进一步的要求见9.1.1。12.2.3等电位连接
12 Electronic equipment 12.1 General This clause applies to all types of electronic equipment, including programmable electronic equipment, components, printed circuit boards, devices and components. 12.2 Basic requirements 12.2.1 Inputs and outputs Status indications of digital inputs and outputs shall be provided. 12.2.2 Electronic control equipment Electronic control equipment (such as NC and PLC) shall be mechanically powered. Power should be led by special or utility transformers. See 9.1.1.12.2.3 Equipotential bonding for further requirements