SubScan NextSubScan (Control Speed for Some Measurements)
The SubScan instruction is used to measure some analog inputs at a faster rate than the program scan or control an AM16/32 multiplexer.
Syntax
SubScan (SubInterval, Units, Count )
NextSubscan
Example
In the following program, the SubScan/Next SubScan instructions are used to execute the VoltDiff instruction at a different interval than the remainder of the program.
Public BatteryV, volt1
BeginProg
Scan (30,Min,3,0)
Battery (BatteryV)
SubScan (15,mSec,10000)
Next SubScan
NextScan
EndProg
Remarks
The SubScan/NextSubScan instructions are placed within the Scan/NextScan instructions of a program. The resolution of the SubScan interval is 10 msec resolution.
Parameters
SubInterval (Interval Between Subscans)
Designates the time interval between the subscans. Enter 0 for no delay between subscans.
Type: Constant
Units
The units for the interval parameter. An alphabetical code is entered. Right-click the parameter to display a list.
| Alphanumeric Code | Description |
|---|---|
| usec | microseconds |
| msec | milliseconds |
| sec | seconds |
| min | minutes |
Type: Constant
Count
Determines the number of times the subscan will run each time the scan runs. Maximum number is 65,535.
Type: Constant integer
Notes:
- SubScans cannot be nested.
- If a SubScan is placed in a SlowSequence, the Interval parameter must be 0 (this facilitates the measurement of multiplexers in a SlowSequence).
- PulseCount measurements cannot be used within a SubScan.
- Measurements cannot be made in a subroutine that is called from a SubScan with an interval.