Scan Time and Channel Latency

 

Network applications must always be concerned with bandwidth and latency:

 

The bandwidth available to the RTU will determine how fast the scan loop can be completed. In practice, the scan time will be effected by such things as baud rate, protocol overhead, network loading, and contention for specific nodes.  The number of channels being scanned is also a major factor.

 

The latency for a channel is a measure of how long it has been since the value for that point was updated. It is a function of the channel scan time, the response time of the remote node, and the occurrence of communications glitches.  This latency has important ramifications upon the RTU ability to detect transient alarm violation conditions.

 

To determine the actual time it will take to complete a scan:

 

 

Alternatively Use:

 

 

See Also:

Connecting to an Industrial Network

Channel Operations Testing

Net 1 (Industrial Networks) Settings

Alarmware™

Alarm Trip Delay