User guide

Instruction Execution Times
Appendix C
Memory Usage,
C–7
Estimating Total Memory Usage of Your System Using a SLC 5/02
Processor
1. Calculate the total instruction words used by the instructions in your
program and enter the result. Refer to the table on page C–6.
2. Multiply the total number of rungs by .375 and enter the result.
3. If you are using a 1747–L524 and have enabled the Single Step
Test mode, multiply the total number of rungs by .375 and enter
the result.
4. Multiply the total number of data words (excluding the
status file and I/O data words) by .25 and enter the result.
5. Add 1 word for each data table file used and enter the result.