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Programming Function Blocks and Features
Video Recorder – User Manual 164
4.24 Scan Rate
Scan rate is the time required to measure inputs, execute function blocks (AI, Loops, AO, DI, DO, CV,
etc.) and update outputs. It is also known as the machine cycle, scan cycle, and update rate.
The Scan Rate prompt lets you set the scan rate of the instrument to a value slower than the maximum
rate allowed by the hardware. The hardware will determine the default scan rate. Allowable entries are
250 milliseconds, 500 milliseconds, 1 second, 2 or 3 seconds. 250 ms rate is only available on 4 input
units.
We recommend the following scan rates for the following configurations.
Table 4-70 Suggested Scan Rates
Inputs Scan Rate W/Control
Up to 4
Up to 12
Up to 16
Up to 24
Up to 32
Up to 44
Up to 48
250 msec
500 msec
750 msec
1 sec
1.5 sec
2.0 sec
3.0 sec
500 msec
1 sec
1 sec
1.5 sec
2 sec
2 sec
3 sec
NOTE
These are suggested scan rates. In general, if your instrument responds too slowly, use a slower (higher)
scan rate. You can use a faster (lower) scan rate than suggested here, but be aware of possible sluggish
display and button response time.