US 11,728,637 B2
Device for communication between a controller and a field device
Benjamin Klimmek, Aerzen (DE); and Felix Schulte, Geseke (DE)
Filed by Phoenix Contact GmbH & Co. KG, Blomberg (DE)
Filed on Oct. 22, 2021, as Appl. No. 17/508,509.
Claims priority of application No. 102020127777.6 (DE), filed on Oct. 22, 2020.
Prior Publication US 2022/0131360 A1, Apr. 28, 2022
Int. Cl. H02H 3/02 (2006.01); H02H 9/00 (2006.01); H02H 1/00 (2006.01)
CPC H02H 3/025 (2013.01) [H02H 1/0007 (2013.01); H02H 9/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device for communication between a controller and a field device, comprising:
contacts, wherein a first subset of the contacts is electrically connected or connectable to the controller, and a second subset of the contacts is electrically connected or connectable to the field device; and
a circuit, an input of which is electrically conductively connected to the first subset of the contacts and an output of which is electrically conductively connected to the second subset of the contacts, the circuit comprising a voltage-limiting unit configured to limit a voltage at the output, and a current-limiting unit configured to limit a current between the input and the output and to interrupt the current upon response of the voltage-limiting unit, wherein the current-limiting unit further comprises a measuring resistor and a detecting resistor, wherein an input of a switching element is electrically conductively connected to the input of the current-limiting unit, an output of the switching element is electrically conductively connected to the output of the current-limiting unit via the measuring resistor, and a signal input of the switching element for detecting the current is electrically conductively connected to the output of the current-limiting unit via the detecting resistor.