摘要
介绍了几种实用的PLCI/O点数扩展方法,运用这些扩展方法可以提高I/O的利用率,实现小容量PLC控制较大或多个系统。
Some applied methods of expanding I/O ports in PLC were introduced. By aid of these methods, the utilization ratio of I/O ports can he increased, and therefore, a small scale PLC can be used to control a larger system or several systems.
出处
《铝加工》
CAS
2009年第5期57-59,共3页
Aluminium Fabrication
