Allen-Bradley Logix5000 Reference Manual page 663

Input Parameter Data Type
TimingMode DINT
OversampleDT REAL
RTSTime DINT
RTSTimeStamp DINT
Input Parameters
Description
Selects timing execution mode.
Value: Description:
0 Periodic mode
1 Oversample mode
2 Real time sampling mode
Valid = 0...2
Default = 0
When TimingMode = 0 and task is periodic, periodic timing is enabled and DeltaT is set to the task scan
rate. When TimingMode = 0 and task is event or continuous, periodic timing is enabled and DeltaT is
set equal to the elapsed time span since the last time the instruction was executed.
When TimingMode = 1, oversample timing is enabled and DeltaT is set to the value of the
OversampleDT parameter.
When TimingMode = 2, real time sampling timing is enabled and DeltaT is the difference between the
current and previous time stamp values read from the module associated with the input.
If TimingMode invalid, the instruction sets the appropriate bit in Status.
Execution time for oversample timing. The value used for DeltaT is in seconds. If TimingMode = 1, then
OversampleDT = 0.0 disables the execution of the control algorithm. If invalid, the instruction sets
DeltaT = 0.0 and sets the appropriate bit in Status.
Valid = 0...4194.303 seconds
Default = 0.0
Module update period for real time sampling timing. The expected DeltaT update period is in
milliseconds. The update period is normally the value that was used to configure the module's update
time. If invalid, the instruction sets the appropriate bit in Status and disables RTSMissed checking.
Valid = 1...32,767ms
Default = 1
Module time stamp value for real time sampling timing. The time stamp value that corresponds to the
last update of the input signal. This value is used to calculate DeltaT. If invalid, the instruction sets the
appropriate bit in Status, disables execution of the control algorithm, and disables RTSMissed
checking.
Valid =1...32,767ms (wraps from 32767 to 0)
1 count = 1 millisecond
Default = 0
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Function Block Attributes Appendix B
663