BeginProg
Scan(1,Sec,0,0)'<<<<Measurement rate is determined by Interval and Units
VoltSe(FastSE(),1,mV2_5,1,False,100, 250,1.0,0)
CallTable FastSETable
NextScan
By modifying the Interval, Units, and Buffers arguments, VoltSE() can be executed at 100 Hz at
100% duty cycle. The following program measures 16 analog-input terminals at 100 Hz.
CRBasic Example 47. Measuring VoltSE() at 100 Hz
PipeLineMode'<<<<Pipeline mode ensures precise timing of measurements.
Public FastSE(16)
DataTable(FastSETable,1,-1)
Sample(16,FastSE(),FP2)
BeginProg
Scan(10,mSec,10,0)'<<<<Measurement rate is determined by Interval, Units, and Buffers
VoltSe(FastSE(),1,mV2_5,1,False,100, 250,1.0,0)
CallTable FastSETable
NextScan
7.9.14.2 Measurement Rate: 101 to 600 Hz
To measure at rates between 100 and 600 Hz, the SubScan() / NextSubScan
instruction pair is added. Measurements over 100 Hz do not have 100% duty
cycle, but are accomplished through measurement bursts. Each burst lasts for
some fraction of the scan interval. During the remainder of the scan interval, the
CR1000 processor catches up on overhead tasks and processes data stored in the
buffers. For example, the CR1000 can be programmed to measure VoltSE() on
eight sequential inputs at 200 Hz with a 95% duty cycle as demonstrated in the
following example:
CRBasic Example 48. Measuring VoltSE() at 200 Hz
PipeLineMode'<<<<Pipeline mode ensures precise timing of measurements.
Public BurstSE(8)
DataTable(BurstSETable,1,-1)
Sample(8,BurstSE(),FP2)
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