US 2024/0267241 A1 · Secondary Means for De-Energizing Safety Field Devices on Fully Digital Protocols

Abstract

A two-wire routing device includes an upstream communication interface for communication with a controller, a two-wire communication and power interface configured to convey communication and power to a field device over a two-wire link, and a router electronic controller. The router electronic controller is coupled to the upstream communication interface and the two-wire communication and power interface. The router electronic controller receives, via the upstream communication interface, a safe state command from the controller, and transmits, via the two-wire communication and power interface, the safe state command to a field device over the two-wire link. The router electronic controller further executes a secondary de-energization scheme for the field device to control a power switch to cut power over the two-wire link to the field device.

Claims20

Dependent claims

A two-wire routing device, the device comprising:

an upstream communication interface for communication with a controller;
a two-wire communication and power interface configured to convey communication and power to a field device over a two-wire link;
and
a router electronic controller coupled to the upstream communication interface and the two-wire communication and power interface, the router electronic controller configured to:
receive, via the upstream communication interface, a safe state command from the controller, the safe state command including a field device identifier;
transmit, via the two-wire communication and power interface, the safe state command to a field device indicated by the field device identifier as a digital signal over the two-wire link;
and
execute a secondary de-energization scheme for the field device, subsequent to transmitting the safe state command to the field device, to control a power switch to cut power over the two-wire link to the field device.

5 more elements

A method for causing a field device to enter a safe state, the method comprising:

transmitting, by the two-wire routing device, the safe state command to a field device indicated by the field device identifier as a digital signal via a two-wire communication and power interface over a two-wire link that also provides power to the field device;
and
executing, by the two-wire routing device, a secondary de-energization scheme for the field device subsequent to transmitting the safe state command to the field device, the secondary de-energization scheme including controlling, by the two-wire routing device, a power switch to cut power over the two-wire link to the field device.

Dependencies are inferred from the claim text.

Secondary Means for De-Energizing Safety Field Devices on Fully Digital Protocols

Life of this patent

Secondary Means for De-Energizing Safety Field Devices on Fully Digital Protocols

Life of this patent

Abstract

Claims20