AIO216
AIO216
AIO216
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提升机是石灰炉的重要设备，它的安全稳定运行直接关系到石灰炉的运转率。提升机曾经使用过接触式行程开关，但现场粉尘比较大，触点经常接触不好，经常造成提升机料斗提升过高，引发生产事故。后来又改为接近开关，现场高温的恶劣环境经常损害接近开关。而且石灰炉顶有毒气体较浓，容易造成维修电工窒息，引发工亡事故，于是客户考虑选择旋转编码器和S2-200型PLC进行控制，旋转编码器可以装在炉底，便于检修，同时旋转编码器的使用寿命比较长，运行可靠。 位置控制需要选用绝对值多圈旋转编码器。目前多圈旋转编码器信号很多，开关量并行输出，采用格雷码。 优点：适合现场恶劣的环境，PLC只需要开关量输入模块，成本低； 缺点：编程复杂，并行输出位有限，不适合高精度，超过最大圈数时就会失去其经济型，且控制系统要求的编码器数量比较多时，布线成本高。提升机行程30米，卷筒直径0.8米，卷筒转动范围在12圈左右，控制精度要求小于25毫米，根据此数据GMX60 R12/6E10 PB可选,用每圈4096线，可转64圈，并行格雷码输出，集电极开路正逻辑输出的宽电压编码器。
客户选用西门子S7-200型PLC是因为其数学运算功能强大，适合格雷码转换成二进制的运算需要。格雷码是无权码，单独某一位不具备任何含义，不能直接用于计算，必须编译成二进制数，才能在PLC进行运算。 绝对值旋转编码器由于具备不可替代的优势，在需要精密定位的场合有着十分广阔的应用前景。 PIC TURBO PROCESSOR
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