Browse Prior Art Database

Interface between a Power Consumption Meter and a Computer

IP.com Disclosure Number: IPCOM000086409D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Bard, SL: AUTHOR [+2]

Abstract

This circuit arrangement relates to the monitoring of plant power consumption.

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Interface between a Power Consumption Meter and a Computer

This circuit arrangement relates to the monitoring of plant power consumption.

Plant electrical power is measured at a remotely located power consumption meter. This meter has two contact closures in it. One closes every 15 minutes. The number of times the second set of contacts close indicates the power used during the 15 minute period.

The use of the DC current source, DC connections and the high-hysteresis detectors insure reliable remote sensing of the contact closures at high-closure rates (approximately 1 closure per 5 sec).

Two latching counters are used. One is allowed to count while the other provides input to the D-to-A converter. Every 15 minutes (as controlled by the clocking relay in the power meter) the two counters exchange functions.

The information gathered during one 15 minute time period is available to the computer at any instant during the following 15 minute period. The computer needs only a realtime clock to tell it when to read the power meter.

The D-to-A converter is used to minimize the number of connections to the computer. Only one connection is made to the computer.

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