功能强
PLC应用微电子技术和微计算机,简单型式都具有逻辑、定时、计数等顺序控制功能。基本型式再加上模拟I/O、基本算术运算、通信能力等。复杂型式除了具有基本型式的功能外,还具有扩展的计算能力、多级终端机制、智能I/O、PID调节、过程监视、网络通信能力、远程I/O、多处理器和高速数据处理能力。
4、编程方便
PLC适用针对工业控制的梯形图、功能块图、指令表和顺序功能表图(SFC)编程,不需要太多的计算机编程知识。新的编程工作站配有综合的软件工具包,并可在任何兼容的个人计算机上编程。
5、适应工业环境
PLC的技术条件能在一般高温、振动、冲击和粉尘等恶劣环境下工作,能在强电磁干扰环境下可靠工作。这是PLC产品的市场生存价值。
6、安装、维修简单
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。
PLC系统与工业总线计算机和DCS系统相互渗透,互为借鉴,相互竞争而发展。促进了工业的进步。
PLC产品面临现场总线的发展,将再次革新,满足工业与民用控制的更高需要。
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