3HAC025841-006

3HAC025841-006

3HAC025841-006

3HAC025841-006

单片机本来抗干扰能力较低，从现在所要求的I/O总数来看，不
论是MCS51系列还是MCS96系列单片机，都必须进行大规模的扩展，这样系统电路更加复杂，进一步降低了系统的可靠性。
· 开发成本高
单片机的售价并不贵，以目前市场价，较有名气的ATMEL也不
过十几元钱一片而已，但简单从这表面上看这个问题是不妥的，以本人几年来单片机开发经验可知，要购入单片机开发装置（如仿真器、烧录器、电源）和还要开模制版等，这都是一笔不小的费用。加上开发周期长所投入的人力物力，其价钱已远远地超过应用PLC开发的费用。
另外由于设备是专用特殊设备，其控制系统专用性较强，通用性较差，为其投入过多的开发费用不值得。
· 开发周期更长
单片机的开发周期较长，从电路设计、开模制版、编程、仿真、调
试等经历非常长的周期，工程师往往要花大部分的时间在硬件设计和编程调试处理上，对最为重要的工艺过程往往没有更多的时间考虑。
· 不便于修改和维护
利用单片机开发的设备往往是专用的特殊设备，在市场上往往不能
找到可替代的备件，所以不便于维护，这是用户最不愿看到的。
基于以上（不限于）的原因，本人认为此方案不适用
2 工控机（IPC）控制
无疑，从可靠性来说，IPC要比单片机要好得多，但其价格昂贵，
不计其整机价格，单就要满足I/O点数据的板卡量（32通道，约10块）费用就不少，其价格要远远高于采用PLC控制的价格。
更为重要的是工控机更新换代较快，不但硬件如此，而且最根本的操作系统也不断地更新换代，换句话说，如果设备控制系统出现故障，更换硬件，可能意味着更新操作系统，进而导致整个系统的应用软件（包括界面）都要重新设计（或开发），这对太多数用户来说是不能接受的。

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