| 摘要 |
<p>In order to monitor motion, such as rotation of a shaft (10), the rotary movement of the shaft (10) is sampled and the position information is passed to a up/down counter which produces counter values which are stored in a cyclic buffer (16). A programmable logic controller (14) then reads the values in that cyclic buffer (16) and controls the rotation of the shaft (10) accordingly. The use of the cyclic buffer (16) separates sampling and storage of the motion data, and this avoids the problems that occur when the motion data is stored by the programmable logic controller itself. <IMAGE></p> |
