Field device
AssigneeAzbil Corporation
InventorKentaro Ohya
Life of this patent
Estimating the term…
Abstract
Disclosed is a field device which determines whether or not an abnormality which was detected is the type of abnormality which may not allow the output of a burn-out H signal, and sets a signal output for the abnormality to a burn-out L signal when the type of abnormality was one which may not allow the output of a burn-out H signal. For example, an abnormality in the D/A converter or the power supply. Therefore, a burn-out L signal is always output for an abnormality judged likely not to be able to output a burn-out H signal, and the certainty of reporting an abnormality when burn-out H is set is enhanced.
Claims4
A field device comprising:
- electric current regulator regulating the value of an electric current that flows in a two-wire transmission circuit in accordance with a measured value, with a specific electric current range as a normal regulating range;
- fault detector detecting various types of faults that occur within the device itself;
- burnout direction setting device able to set whether to output to the transmission circuit a first burnout signal of a level higher than an upper limit value of the normal regulating level or to output to the transmission circuit a second burnout signal that is less than a lower limit value for the normal regulating range, when a fault has been detected by the fault detector;
- and burnout direction changing device evaluating whether or not it is possible to output the first burnout signal in relation to a fault that has been detected by the fault detector, and causing the signal that is outputted in response to the fault to be the second burnout signal if it is determined that it is not possible to output the first burnout signal.
Dependencies are inferred from the claim text.