In many cases, the DCS was merely a digital replacement of the same functionality provided by analog controllers and a panelboard display. 很多情况下,直接数字控制仅仅是一种数字式替代,它的功能同多个模拟控制器和一个面板显示器所提供的功能一样。
A distribution board (also known as panelboard or breaker panel) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits, while providing a protective fuse or circuit breaker for each circuit in a common enclosure. Normally, a main switch, and in recent boards, one or more residual-current devices (RCD) or residual current breakers with overcurrent protection (RCBO), are also incorporated.