... controller. A modulating controller does not receive an actuator retransmission signal and must always assu-me a linear actuator action. If the actuator has a non-linearity, or play is present in the actuator ... transferfrom automatic to manual mode, where the manipulating variable remains at its current value, andcan then be changed manually.In case of a broken probe, caused, for example, by a cable ... regulating valve. The actuating controller operates the ac-tuator via two switching outputs, and receives an actuator retransmission signal (usually a stan-dard signal 0/4 — 20mA, 0/2 — 10V...