Rolling Timestamp of Data

Rolling timestamp represents the time when the current

I.Chxx.Data

is sampled. It is a continuously running 15-bit rolling timestamp that counts in milliseconds from 0…32,767 ms. The rolling timestamp value is reported in the

I.Chxx.RollingTimestamp

tag for the analog I/O modules.

The controller program uses the last two rolling timestamp values to calculate the amount of time between the samples.

A system time change can cause a slight change in input sample timing. The rolling timestamp accurately reflects the change. There can be jitter in the timing between samples before and after the system time change.