Patent ID: 9689722
Date: 2017-06-27
CPC Classifications: G01D,G05B,G06F,H04B

Claim:
1. A method for monitoring a transmitter having a measurement unit, a transmission unit, a connecting line, and a signal transmission element that is part of a field bus, the measurement unit and the transmission unit being interconnected at least for transmission of signals and being connected by the connecting line for supplying power from the transmission unit to the measurement unit, comprising the steps of: using the measurement unit to determine a measurement quantity and to produce a measurement signal which is dependent on the determined measurement quantity, using the transmission unit to receive the measurement signal from the measurement unit and to transfer an output signal in converted form to the signal transmission element based on the measurement signal, tapping signal from the signal transmission element and supplying the signal that has been tapped back to the transmission unit for transmission back to the measurement unit as a comparison signal, inducing from the transmission unit, a determination of the measurement quantity by the measurement unit, transferring the comparison signal, which corresponds to the signal tapped from the transmission element and input to the transmission unit from the transmission element, to the measurement unit, comparing the comparison signal with a stored signal and producing a comparison result, and depending on the comparison result, either the measurement signal which has been generated following the determination of the measurement quantity is transferred from the measurement unit to the transmission unit if a positive comparison result is produced or an error signal is transferred from the measurement unit to the transmission unit by acting on the connecting line if a negative comparison result is produced.