US 11,456,777 B2Granted

Data recording device with a HART multiplexer

AssigneeSiemens Aktiengesellschaft

InventorsEric Chemisky, Siva Prasad Katru

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Abstract

A data recorder contains a HART multiplexer with channels that are provided with coupling members for capacitive coupling to multiple HART field devices supplied via current loops, wherein a HART modem is arranged downstream of the HART multiplexer, and downstream of the HART modem is a processor with an interface that controls HART communication of the data recorder, where to automatically and quickly identify changes in the connection configuration of field devices capacitively connected to the HART multiplexer, a pulse discriminator is connected at each channel that detects signal pulses induced by the loop current on the channel being interrupted and/or switched on and which differ from HART signals and upon detection generates an interrupt signal for the processor, and in response to the interrupt signal, the processor terminates HART communications on the channel and generates a HART command for requesting identification of a HART field device on the channel.

Claims8

Dependent claims

A data recording device comprising:

a multichannel Highway Addressable Remote Transducer (HART) multiplexer, each respective channel of the multichannel HART multiplexer having coupling members for capacitive coupling to multiple HART field devices supplied via current loops;
a HART modem downstream of the HART multiplexer;
and
a processor arranged downstream of the HART modem and between said HART modem and a field bus interface, said processor controlling HART communication of the data recording device;
wherein a respective pulse discriminator connected at each respective channel which detects signal pulses induced by the loop current on the respective channel being interrupted and/or switched on and which are different from HART signals and upon detection of said signal pulses generates an interrupt signal for the processor;
and
wherein the processor is configured to, in response to an interrupt signal, terminate HART communication running on the respective channel and to generate a HART command for requesting an identification of a HART field device on the respective channel.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/466,049Filed 3 Sep 2021
Priority: DE 102020211217.77 Sep 2020
Published: US 2022/0077892 A110 Mar 2022
Granted: 27 Sep 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04L 67/12
Protocols: specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in…
H04Q 9/00
Arrangements in telecontrol or telemetry systems for selectively calling a substation from
H04B 5/22
Characterised by the transmission technique; characterised by the transmission medium: capacitive coupling
H04L
Digital communication