Method for checking the operation of a process engineering field device and process engineering field device

摘要

In a method for checking the operation of a process-technical field device, in particular positioner (1), for controlling a powered by an auxiliary power, such as pneumatics, actuator (3) of a process plant, which field device, a current / auxiliary power converter, such as a I / P-converter (13), which can deliver a predetermined auxiliary power security signal to bring the actuator (3) in a predetermined safety position; an electrical safety circuit (37) which is connected upstream of the current / auxiliary energy converter and which can be brought from a passive switching state into an active switching state as a function of an electrical control and / or regulating control signal (i) arriving at the field device, in which the electrical safety circuit ( 37) causes the power / auxiliary power converter to deliver the auxiliary power security signal, wherein the safety circuit (37) then automatically enters the active switching state, when the electrical control and / or control signal (i) a for the safety circuit (37) specific Stromstärken- and / or voltage threshold below or exceeds, it is provided that an input current strength and / or voltage of the electrical control and / or control control signal (i) field device is individually changed such that a safety circuit individual electrical test signal is generated, and the test signal the safety circuit (37) a is given to these on ...