与计算机系统相比,PLC安装不需要特殊机房和严格的屏蔽。使用时只要各种器件连接无误,系统便可工作,各个模件上设有运行和故障指示装置,便于查找故障,大多数模件可以带电插拔,模件可更换,使用户可以在短的时间内查出故障,并排除,大限度地压缩故障停机时间,使生产迅速恢复。然后再对故障模件进行修复,这对大规模生产场合尤为适宜。
一些PLC外壳由可在不良工作环境下工作的合金组成,结构简单,上面带有散热槽,在高温下,该外壳不像塑料制品那样变形,还可抗无线电频率(RF高频)电磁干扰、防火等。
7、运行速度快
随着微处理器的应用,使PLC的运行速度增快,使它更符合处理高速度复杂的控制任务,它与微型计算机之间的差别不是很明显。
8、总价格低
PLC的重量、体积、功耗和硬件价格一直在降低,虽然软件价格占的比重有所增加,但是各厂商为了竞争也相应地降低了价格。另外,采用PLC还可以大大缩短设计、编程和投产周期,使总价格进一步降低。
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