可精确控制，聚焦光电点小，可高精度定位，易实现自动化。
Accurate control, small focus electro-optical point, high precision orientation, realize automation easily.
采用光电编码器、高速计数模板、PLC程序控制方案实现钢板的定位剪切，提高了中板成材率。
By using encoder, high speed counter module and PLC sequencing control in steel plate positioning shearing, medium plate yield have been increased.
提出在卷筒包装纸进退式光电定位系统中，采用无触点（全电子式）比较判别及控制电路，替代目前常用的触．点式同类电路。
It is suggested in this paper that a kind of contact-free circuit for comparison and control should substitute for the conventional contact one in the back-forth wrapper web position control system.
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