| 摘要 |
<p>PURPOSE:To reduce a space for providing a transducer, by adding a meter relay function, which obtains outputs when input values exceed specified ranges, and making it possible to clear the upper and lower limit values by specified operations. CONSTITUTION:Input signals 1a and 1b of physical quantities such as current, voltage, temperature and pressure in specified ranges are converted into signals at specified levels through an A/D converter 3. Meanwhile, the upper and lower limit values of the input signals are set in a memory device 4 beforehand. When the input signals 1a and 1b exceed the upper and lower limit values, outputs 13 and 14 are sent out. Such a function of a meter relay is assembled as a unitary body. In correspondence with the state of mode switches SL, the upper and lower limit values are cleared when a power source part 19 is reset. When the input signals exceed the ranges of the upper and lower limit values, the outputs are obtained. When the already stored upper and lower limit values are to be cleared, the values are cleared only by turning ON and OFF the power source as a set mode.</p> |
