Programmable time registering AC electric energy meter having electronic accumulators and display

A time registering electric energy meter for measuring an AC electric energy quantity in response to time differentiated rates, said meter comprising:

• means producing metering pulse signals at a rate responsive to said AC electric energy quantity to be measured;
• means including first read-write memory means responsive to said metering pulse signals for accumulating variable coded values of one parameter of said AC electric energy quantity in separate ones of plural measuring data storage register means;
• means producing regularly occurring timing signals;
• means including second read-write memory means responsive to said timing signals for accumulating variable real time and data coded data in separate ones of plural storage register means, said plural storage register means including minutes, hours, day of the week and day of the year storage register means;
• means including third read-write memory means for storing a plurality of fixed rate switch control point data codes in sequential ones of plural storage registers with each of said rate switch point data codes having identical data formats including encoded hour and encoded minutes data in time of day storage register means, an encoded one of a day of the week and a day of the year in a type of day storage register means and an encoded one of said time differentiated rates in a rate code storage register means;
• control logic means for sequentially comparing at a predetermined rate of said timing signals the real time and date coded data of said second memory means with the stored rate switch point data codes in a sequential order of comparison being the same as the sequential order of the storage thereof in said third memory means, said control logic further including means responsive to matching of common time and date coded and encoded data of said second and third memory means for producing a current rate switch time logic state therein, said control logic means further including means responsive to said current rate switch time logic state to effect a change in the accumulation of said coded values of said one parameter from one to another of said measuring data storage register means such that said parameter is accumulated in response to the encoded time differentiated rate of the rate switch point data code producing the matched comparison of said second and third memory means;
• optoelectronic display means responsive to said control logic means including plural display digit elements and wherein predetermined ones of said digit elements provide numerical readouts of the quantities stored in predetermined ones of said first-named and second-named plural measuring data storage register means;
• and
• further read-write memory means connected with said logic control means and including plural display digit storage register means for encoding the numeric value of one of said quantities to be displayed at an associated one of said digit elements, display sequence timer means responsive to said timing signal for counting predetermined display time intervals;
• and display data counter storage register means for sequentially storing coded values corresponding to the separate ones of plural measuring data storage register means and being incremented at the end of said display time intervals for effecting a change in the quantity being displayed at the numerical readouts of said display means.

A time registering electric energy meter for measuring an AC electric energy quantity in response to time differentiated rates, said meter comprising:

• means producing metering pulse signals at a rate responsive to said AC electric energy quantity to be measured;
• means including first read-write memory means responsive to said metering pulse signals for accumulating values of one parameter of said AC electric energy quantity in separate ones of plural measuring data storage register means;
• means producing regularly occurring timing signals;
• means including second read-write memory means responsive to said timing signals for accumulating real time and date coded data in separate ones of plural storage register means, said plural storage register means including minutes, hours, days of the week and day of the year storage register means;
• means including third read-write memory means for storing a plurality of rate switch control point data codes in sequential ones of plural storage registers with each of said rate switch point data codes having identical data formats including encoded time of day data, encoded type of day data and encoded rate code data designating one of said time differentiated rates;
• control logic means for sequentially comparing at a predetermined rate of said timing signals the real time and date coded data of said second memory means with the stored rate switch point data codes in a sequential order of comparison being the same as the sequential order of the storage thereof in said third memory means, said control logic further including means responsive to matching of common time and date coded and encoded data of said second and third memory means for producing a current rate switch time logic state therein, said control logic means further including means responsive to said current rate switch time logic state to effect a change in the accumulation of said coded values of said one parameter from one to another of said measuring data storage register means such that said parameter is accumulated in response to the encoded time differentiated rate of the rate switch point data code producing the matched comparison of said second and third memory means;
• data communication interface means responsive to externally receive data for receiving time and date synchronizing data in said second memory means and transmitting measuring data from said first memory means to external devices for storage and display;
• and
• further read-write memory means including first and second security code data storage registers having coded data transmittable through said data communication interface means, and wherein said control logic means includes means providing new coded data in said first security code data storage register in response to predetermined events and transferring the replaced coded data of said first to said second security code data storage register so as to define old coded data in the second data storage register, the new and old coded data being further transmittable through said data communication interface subsequent to the first-named transmission of the coded data of said first and second security code data storage registers for comparison with said first transmitted coded data, said comparison revealing unauthorized communications with said meter.