| 摘要 |
PURPOSE:To make cost low by providing the first - the second A/D conversion measures and a selective means of the output. CONSTITUTION:An analogue speed command VO is inputted to the first A/D conversion measure through an amplifier A1, and the digital output D1 of only positive voltage input is made. Negative input is only converted into positive output through an amplifier A2, and it is inputted to the third A/D conversion measure. In the neighborhood of zero point, a bias is added to an amplifier measure A3 by a bias means 1. Those converted digital values are outputted through matching measures K1-2 and through a change-over circuit 2 of a selective means. |
