13.4.9.1 Timing Examples
The following illustrations show the relationship between the PLC output scan time, the
produced exchange timer, and data samples on the network.
Example 1
Only one sample is produced on the network per producer period expiration. The
variability between samples can be up to producer CPU sweep time.
Producer Period = 1.5 Times CPU Sweep
Producer PLC Output Scan
Ethernet Global Data
Production Timer Expires
Sample on Network
Example 2
More than one sample can be produced per producer period expiration and stale samples
are produced to the network.
Producer Period = 2/3 Time of CPU Sweep
Producer PLC Output Scan
Ethernet Global Data
Production Timer Expires
Sample on Network
Stale Data is Produced
260 GFK-1503E VersaMax PLC User Manual
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