Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 455)

A–B
C
Appendix
C–1
Memory Usage, Instruction Execution Times
This appendix covers the following topics:
•
memory usage
•
instruction execution times for the fixed and SLC 5/01 processors
•
instruction execution times for the SLC 5/02 processor series A and B
•
instruction execution times for the SLC 5/02 processor series C and later
SLC 500 controllers have the following user memory capacities:
Type of Processor Type of Controller User Memory Capacity
Fixed I/O Controllers
Fixed and SLC 5/01
Modular Controllers 1747–L511
1024 instruction words
SLC 5/02 Modular Controllers 1747–L524 4096 instruction words
Definition: 1 instruction word = 4 data words = 8 bytes.
The number of instruction words used by the individual instructions is
indicated in the following table. Since the program is compiled by the
programmer, it is only possible to establish estimates for the instruction
words used by individual instructions. The calculated memory usage is
normally greater than the actual memory usage, due to compiler
optimization.
Memory Usage