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2-8 Series 90-30/20/Micro Programmable Controllers Reference Manual
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September 1998 GFK-0467K
2
Application Program Logic Scan or Solution
The application program logic scan is when the application logic program actually executes. The
logic solution always begins with the first instruction in the user application program immediately
following the completion of the input scan. Solving the logic provides a new set of outputs. The
logic solution ends when the END instruction is executed (the END is invisible unless you are
using a Hand-Held Monitor).
The application program is executed by the ISCP and the 80C188 microprocessor. In the Model
313 and higher CPUs, the ISCP executes the boolean instructions; and the 80C188 or 80386EX
executes the timer, counter, and function blocks. In the Model 311 and 90-20 CPUs, the 80C188
executes all boolean, timer, counter, and function block instructions. On the Micro, the H8
processor executes all booleans and function blocks.
A list of execution times for each programming function can be found in Appendix A.