Electropneumatic positioner and a field device having an electro-pneumatic positioner

An electropneumatic positioner for a pneumatic actuator to operate a control device of a processing plant, comprising:

• two modular pneumatic slots configured to engage with a respective modular pneumatic component, the two pneumatic slots and the pneumatic components being modularly matched to one another such that their respective pneumatic interfaces merge into one another when a pneumatic slot is engaged, and
• a pneumatic control output configured to output a pneumatic control pressure signal to the pneumatic actuator, the two modular pneumatic slots and the pneumatic control output forming a pneumatic series connection, wherein a downstream pneumatic slot of the two pneumatic slots is engaged with a pneumatic switching device that is configured to operate in either a release state, in which the pneumatic switching device provides a pneumatic connection to transmit the pneumatic control pressure signal between at least one upstream pneumatic slot of the two pneumatic slots and the pneumatic control output, and a locked state in which the pneumatic switching device is configured to seal off the pneumatic connection.