Landis+Gyr E470 User Manual page 16

Page 16 of 69
© Landis+Gyr
Issue: 1.8
When the present balance register falls to zero, the meter will send a pass
through message to the gas meter to close its valve and disconnect the gas
flow. The electricity meter will also open its own contactor.
Accounting in single wallet mode
The meter receives cost data from the gas meter in the form of a Gas Cost
since Start of Day on each ½ hour and daily in the form of a Day's Gas
Cost value, received at midnight.
The meter uses the received Gas Cost since Start of Day value to reduce
Present Balance for gas usage every ½ hour.
The Gas Cost since Start of Day value is a rising value of cost since the
start of the day, reset each midnight.
Example:
the meter calculates a particular ½ hours usage in the following manner:
 The meter stores a value of the gas cost since start of the day
At midnight the stored value will be reset

When a new value is received the stored value is subtracted from

the new value to gas the last 30 minutes usage. The present
balance register is reduced by the calculated value.
 The original stored value is overwritten with the new value.
£
The meter records the total value collected from the Present balance
register through ½ hourly messages, to enable reconciliation to the Day's
Gas Cost value. This is recorded daily for a rolling 28 days, and ca
recorded as extra data within the gas daily profile held within the electricity
meter.
As there is the possibility of a ½ hourly message being missed a
reconciliation process will be made against the Day's Gas Cost value
received each day or as part of the data catch up process. The Day's Gas
Cost value will be considered as the master value. On receipt of the Day's
Gas Cost value the meter reconciles the amount for the appropriate day
against the recorded amount collected through the ½ hourly messages.
30 min value
. . .
E470 Tokenless Smart Prepayment Meter
Meter Operation
Cost since start of day
value (rising)