設(shè)計要點(diǎn)
該系統(tǒng)軟件設(shè)計的重點(diǎn)為:1)準(zhǔn)確配置高速計數(shù)器;2)位置控制器的允差設(shè)計,允差的選擇應(yīng)盡量小以提高伺服系統(tǒng)的控制精度,在滿足系統(tǒng)定位精度的前提下,允差的設(shè)計上還需要考慮于機(jī)械結(jié)構(gòu)定位的分辨率,以免設(shè)置值過小機(jī)械結(jié)構(gòu)控制不到位而引起驅(qū)動電機(jī)反復(fù)轉(zhuǎn)動調(diào)節(jié),往往需要現(xiàn)場標(biāo)定;3)初始位置的精確標(biāo)定,需要注意的是初次標(biāo)定各檔位位置時應(yīng)使用手動控制方式,并且要將機(jī)械限位開關(guān)狀態(tài)接入PLC。由于采用增量式光電編碼器,計數(shù)器當(dāng)前值要存在PLC的掉電可保存寄存器MDl4中。
程序設(shè)計
在程序中首先需要將高速計數(shù)器配置為A/B相正交輸入,4倍計數(shù)速率,增計數(shù),并使能高速計數(shù)器,然后將標(biāo)定好的各檔位位置填入相應(yīng)的地址中,并且設(shè)置允差為兩個脈沖,也就是說各檔位的脈沖數(shù)加減2即為相應(yīng)的到位。伺服系統(tǒng)傳動裝置的間隙是多樣性的,并且對伺服控制的性能有影響,設(shè)置允差的目的是為了消除由于伺服傳動間隙引起的系統(tǒng)不穩(wěn)定,從而準(zhǔn)確定位。
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