UNS0868B-P ABB

The overall size of the application is often an important distinguishing feature.Many small PLCs indeed have the function of extending the initial boundary of the control system by adding a main bus controller module.Whether utilizing multiple racks or using dedicated remote I/O,both can expand the I/O count to 100,000 or more.This can greatly reduce the man-hours required for system configuration and development.Newer PLC-based PACs generally have a smaller footprint and,therefore,are in many cases much smaller than PACs,allowing more external I/O to be added.

应用的整体规模，经常是一个用于区分的重要特性。很多小型的PLC，确实也具有通过增加一个总线控制器主模块，来扩展控制系统的初始边界的功能。无论是利用多个机架，还是使用专用的远程I/O，两者都可以将I/O点数扩展到10万甚至更多。这可以大幅度降低系统组态和开发所需要的人工时。更新一些的基于PLC的PAC，一般具有较小的体积，因此，在很多情况下要比PAC小很多，这就允许增加更多的外部I/O。