| 摘要 |
<p>PURPOSE:To improve the work efficiency of a test by providing a contact to interrupt a signal to a plant at the inside of an input output terminal beforehand and shorting a signal output part and a signal input part in a device. CONSTITUTION:For a process control device 3, a pair of input terminals 4a-4b, to which a signal line 10a of a process quantity signal (a) from a plant 1 is connected, is connected through first contacts 21a-21b to interlock respectively to an A/D converting part 5 as a signal input part. A resistance 23 for converting a current and a voltage is connected through a switch 22 between the A/D converting part side terminals of the first contacts 21a-21b, and a pair of output terminals 8a-8b, to which a signal line 10b of an operation quantity signal (b) to transmit to the plant 1 is connected, is connected through second contacts 24a-24b respectively to a current output part 7. Further, simulation contacts 25 and 26 are inserted between the input terminal of the A/D converting part 5 and the output terminal of the current output part 7.</p> |
