1 Publication 1762-RM001C-EN-P
Appendix
B
MicroLogix 1500 Memory Usage and Instruction
Execution Time
This appendix contains a complete list of the MicroLogix 1500
programming instructions. The list shows the memory usage and
instruction execution time for each instruction. Execution times using
indirect addressing and a scan time worksheet are also provided.
Programming
Instructions Memory
usage and Execution
Time
The tables below lists the execution times and memory usage for the
programming instructions. These values depend on whether you are
using word or long word as the data format.
Table B.1 MicroLogix 1500 Controllers -
Memory Usage and Instruction Execution Time for Programming Instructions
Programming Instruction Instruction
Mnemonic
Word Long Word
Execution Time in µs Memory
Usage in
Words
Execution Time in µs Memory
Usage in
Words
False True False True
ASCII Test Buffer for Line
(1)
ABL 11.4 94 + 7.6/char. 3.3 Long Word addressing level does not apply.
ASCII Number of Characters in
Buffer
(1)
ACB 11.0 84.2 3.3
ASCII String to Integer
(1)
ACI 0.0 14.2 + 6.3/
char.
1.5 0.0 20.3 + 9.5/char. 1.5
ASCII Clear Buffer
(1)
ACL 0.0 clear:
both 203.9
receive 24.7
transmit 29.1
1.2 Long Word addressing level does not apply.
ASCII String Concatenate
(1)
ACN 0.0 17.9 + 10.2/
char.
2.0
Add ADD 0.0 2.5 3.3 0.0 10.4 3.5
ASCII String Extract
(1)
AEX 0.0 12.4 + 2.6/
char.
2.5 Long Word addressing level does not apply.
ASCII Handshake Lines
(1)
AHL 10.8 89.3 5.3
ASCII Integer to String
(1)
AIC 0.0 25 + 4.3/char. 1.4 0.0 68.7 1.6
And AND 0.0 2.0 2.8 0.0 7.9 3.0
ASCII Read Characters
(1)
ARD 10.7 108 + 44/char. 4.3 Long Word addressing level does not apply.
ASCII Read Line
(1)
ARL 10.6 114 + 44.3/
char.
4.3
ASCII String Search
(1)
ASC 0.0 13.4 + 3.5/
matching
char.
6.0
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