Abstract
This chapter discusses devices. Open architecture computers, which allow independent manufacturers to design add-on products, are proving to be a real boon to both industrial control system OEMs and end users. They have resulted in a bewildering array of computer level, plug-in I/O products that offer a variety of complete solutions to control problems. One of the advantages to using smart I/O modules, single or multichannel, on distributed I/O systems is that one digital data link running from the host computer can replace hundreds of costly dedicated wires associated with older analog systems. Using a digital data link, the host computer can economically communicate with widely distributed I/O devices scattered around the plant over long distances. RS-232C is the most widely used communication standard for the interconnection of digital devices. It is intended for connection of a single device to a host computer at distances up to 200 feet without modems.
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