Spectrum Controls 1756sc-IF8u - Manual (Page 53)

Chapter 5: Channel Configuration, Data, and Status 41
.RealTimeSample
10-30,000 ms INT
The time in milliseconds that updated input data is to be sent from the
module to the controller. If this value is smaller than the minimum update
time to scan all input channels, then the actual rate will be greater than this
value. In this case you may determine what the actual sample time is by
subtracting two successive values of the .RollingTimeStamp input tag.
Real Time Sampling (RTS) and Requested Packet
Interval (RPI)
This RealTimeSample tag instructs the module to scan its input channels
and obtain all available data. After the channels are scanned, the module
multicasts that data. This feature is used on a module-wide basis.
During module configuration, you specify a Real Time Sampling (RTS)
period via the .RealTimeSample tag and a Requested Packet Interval
(RPI) period. Both of these features instruct the module to multicast data,
but only the RTS feature instructs the module to scan its channels before
multicasting.
You may access the RPI in the Module Properties menu.