AS-B827-032
AS-B827-032
AS-B827-032
1、系统规模首先应确定系统用PLC单机控制，还是用PLC形成网络，由此计算PLC输入、输出点。数，并且在选购PLC时要在实际需要点数的基础上留有一定余量（10%）。
2、确定负载类型根据PLC输出端所带的负载是直流型还是交流型，是大电流还是小电流，以及PLC输出点动作的频率等，从而确定输出端采用继电器输出，还是晶体管输出，或品闸管输出。不同的负载选用不同的输出方式，对系统的稳定运行是很重要的。
3、存储容量与速度尽管国外各厂家的PLC产品大体相同，但也有一定的区别。目前还未发现各公司之间完全兼容的产品。各个公司的开发软件都不相同，而用户 程序的存储容量和指令的执行速度是两个重要指标。一般存储容量越大、速度越快的PLC价格就越高，但应该根据系统的大小合理选用PLC产品。
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