6.9.3.3. Summation registers
The meter can be configured with up to four summation energy registers that algebraically sum the contents of
up to five energy rate registers (internal or external) recording the same type of energy.
The illustration below shows two (out of four) summation paths with five inputs (A,B,C,D and E) each.
The result of the summation process is only stored in the register if it is a positive value. Negative or null results
are equal to zero and not stored.
The summation calculation takes place once-a-second, so any pulse input signal used for summation must have
a frequency higher than 1Hz to ensure accuracy.
Note: On the summation registers, when a calculation is done (Q1 phase 3 – Q1 phase 2 for example), meter will
see a difference between this value and the soustraction of the 2 register values. This difference is due to the fact
that the difference between the 2 values (Q1 phase 3 – Q1 phase 2 for example) has to be positive. If it is not the
case, this difference will be forced to zero. So only the positive values are accumulated in the summation
registers.
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