The pending amount of excess for this register. For locally measured registers and discrete registers, this is always zero. For remote registers, this becomes non-zero if the rate of change to be recorded is outside of the actual rate plus/minus 10%. This is being done to prevent recording big spikes when a remote device is offline for some time and then comes back online. Instead of recording a big jump, an excess is recorded which will then be played back over time by inflating (or deflating) the recorded rate by up to +/-10% of the actual rate until the excess has been drained. The excess of all registes can be reset to zero with the clear command.