FIELD DEVICE

• US 20130282191A1
• Filed: 04/18/2013
• Published: 10/24/2013
• Est. Priority Date: 04/18/2012
• Status: Active Grant

• Current Assignee: Azbil Corporation (Azbil BioVigilant Incorporated)
• Original Assignee: Azbil Corporation (Azbil BioVigilant Incorporated)
• Inventors: OKUDA, Kouji, NAGOYA, Hiroaki, OHYA, Kentaro
• Granted Patent: US 9,280,170 B2
• Time in Patent Office: Days
• US Class Current: 700/286
• CPC Class Codes: G05F 5/00 Systems for regulating electric variables by detecting deviations in the electric input to the system and thereby controlling a device within the system to obtain a regulated output

Abstract

A field device has a primary power supply generating circuit that generates a primary power supply from an electric current that is supplied through a pair of electric wires from a higher-level system, and a calculation processing portion and various functional circuit portions, which operate based on a supply of an operating power supply electric current produced from the primary power supply. The field device also has an operating power supply electric current supplying unit that supplies the operating power supply electric current to a calculation processing portion with maximum priority. The calculation processing portion receives the operating power supply electric current supplied with maximum priority, clears a self-reset operation after starting up itself, and then directs sequentially, following a predetermined sequence, supply of the operating power supply electric current to each of the various functional circuit portions.

Claims

1. :

A field device including a primary power supply generating circuit that generates a primary power supply from an electric current that is supplied through a pair of electric wires from a higher-level system, and a calculation processing portion and various functional circuit portions, which operate based on a supply of an operating power supply electric current produced from the primary power supply, the field device comprising;

an operating power supply electric current supplying unit that supplies the operating power supply electric current to a calculation processing portion with maximum priority, wherein

the calculation processing portion receives the operating power supply electric current supplied with maximum priority, clears a self-reset operation after starting up itself, and then directs sequentially, following a predetermined sequence, supply of the operating power supply electric current to each of the various functional circuit portions.

2. :

The field device as set forth in claim 1, wherein

the calculation processing portion directs supply of the operating power supply electric current to the various functional circuit portions in a sequence for starting up with which startup conditions are satisfied, in accordance with a startup sequence and startup conditions that are established for each of the various functional circuit portions.

3. :

The field device as set forth in claim 2, wherein

the operating power supply electric current supplying unit is a supply current monitoring circuit that monitors, as a supply current, a current that can be supplied from the primary power supply, where if the supply current is at least an electric current that is required for starting up the calculation processing portion, supply of the operating power supply electric current to the calculation processing portion is started and an electric current value for the supply electric current being monitored is outputted to the calculation processing portion; and

the calculation processing portion evaluates whether or not the startup conditions of the various functional circuit portions have been fulfilled, based on the electric current value of the supply current from the supply current monitoring circuit.