| 摘要 |
<p>A circuit board (1) for a programmable controller has a number of plug-in input modules (11) which may be of widely varying type. The board of the invention allows the input signals to be matched to the modules by providing a voltage controlling circuit (40) between each input module station and its associated input terminals (12) on the board. Each voltage controlling circuit comprises potentiometer means (41, 42) and filter means (43).</p> |
