| 摘要 |
The present invention relates to a device for adaptation of analog input signals (AI) or output signals (AO) and which, per se, exhibits the functions selection between utilization as analog input or output unit, selection between function as current or voltage input unit, in the latter case with an optional voltage range, as well as selection between function as current or voltage output unit. In addition, the device is provided with overcurrent protection and overvoltage protection as well as circuits for supervision of current and voltage values at the output. The latter supervision is realized by feeding back the current and voltage values and comparing them with expected values. The protection function of the device allows unlimited faulty connection under current and voltage conditions within the field of application. All of these enumerated functions are accommodated within one and the same electronic unit, which is achieved by a far-reaching integration of the components used in few integrated circuits. The selection of function mode is achieved by a simple programming. |
