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Another loop may contain two passive chart recorders, a passive pressure transmitter, and a 24 V battery (the battery is the active device). Note that a 4-wire instrument has a power-supply input separate from the current loop. Panel mount displays and chart recorders are commonly termed "indicator devices" or "process monitors".
The HART Communication Protocol (Highway Addressable Remote Transducer) is a hybrid analog+digital industrial automation open protocol. Its most notable advantage is that it can communicate over legacy 4–20 mA analog instrumentation current loops, sharing the pair of wires used by the analog-only host systems.
A digital current loop uses the absence of current for high (space or break), and the presence of current in the loop for low (mark). [1] This is done to ensure that on normal conditions there is always current flowing and in the event of a line being cut the flow stops indefinitely, immediately raising the alarm of the event usually as the heavy noise of the teleprinter not being synchronized ...
This would be the equivalent of the currently used 4–20 mA communication scheme which requires that each device have its own communication point at the controller level, while the fieldbus is the equivalent of the current LAN-type connections, which require only one communication point at the controller level and allow multiple (hundreds) of ...
Macy’s on Monday said an employee responsible for managing accounting for small package deliveries concealed up to $154 million in expenses over the course of nearly three years.
Current loop; Retrieved from "https: ... Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
French police officers made two arrests after a brief fan-fight at a Nations League soccer game between France and Israel, Paris police chief Laurent Nunez said Friday. Stewards “immediately ...
Francis, leader of the 1.4-billion-member Catholic Church, is usually careful not to take sides in international conflicts, and to stress de-escalation. But he has stepped up his criticism of ...