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72 T1-16S User’s Manual
5. Operating System Overview
User program execution:
Executes the programmed instructions from the beginning to the END instruction.
This is the essential function of the T1-16S.
In this section, only the main program execution is mentioned. For other program
types, such as timer interrupt, etc., refer to section 6.5.
Peripheral support:
Supports the communications with the programming tool or external devices
connected by the computer link function. The time for this operation is limited within
approx. 2 ms in the floating scan mode, and within allowable idling time in the fixed-
time scan mode.
If the special relay S158 is set to ON, the peripheral support priority mode is selected.
In the peripheral support priority mode, the peripheral support time is not limited. As
the result, the communication response is improved although the scan time becomes
long at the time.
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