Abstract: In a position closed-loop controller (31) for a valve control device (1) of a process engineering plant (100), comprising a first signal input (11) for a pilot signal, such as a process control signal (pg) from a process closed-loop controller (120) of the process engineering plant (100), a second signal input for a position actual signal (i) with regard to a control valve (35), wherein the position control-loop controller (31) is designed to generate a more particularly pneumatic control variable (g) for an actuator (33) to actuate the control valve on the basis of the pilot signal and the position actual signal (i) and comprises a more particularly pneumatic control output for the control variable (g).

Abstract: In a method for diagnosing control system of a process engineering plant having a plurality of actuating units for setting a process fluid and a central unit, at least one actuating-unit-specific control raw datum, such as a setpoint value, an actual value, a setpoint-actual difference value, or a control value, is detected; a particularly local diagnosis code is generated by one of the plurality of actuating units based on the at least one detected control raw datum; the diagnosis code is transmitted from the actuating unit to a central unit; a local diagnosis code, is transformed into a global diagnosis codes; a logical condition for a diagnosis deduction logic is defined such that when the logical condition is applied to at least one diagnosis code, the diagnosis deduction logic determines a predetermined deduction result; and a deduction result is determined based on the at least one diagnosis code.

Abstract: A positioner for a process plant, such as a chemical plant, a power plant, or a food processing plant, may include a control valve for controlling a process fluid flow of the process plant, a pneumatic actuator for actuating the control valve, and positioner electronics for determining and providing a pneumatic control signal for the actuator based on a control variable. The positioner electronics may include a signal receiving interface for receiving the control variable. The positioner electronics may include a computing device configured to determine at least one simulation parameter that characterizes a signal response of the positioner to a received control variable. The positioner electronics may include a signal output interface for outputting the at least one simulation parameter.