Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers User Manual
Page 331

Publication 1785-UM012D-EN-P - July 2005
Instruction Set Quick Reference D-31
Category
Code
Title
Execution Time (
µ
s)
Integer
Execution Time (
µ
s)
Floating Point
Words of
Memory
(1)
True
False
True
False
Arithmetic
ADD
add
6.1
1.4
14.9
1.4
4-7
SUB
subtract
6.2
1.4
15.6
1.4
4-7
MUL
multiply
9.9
1.4
18.2
1.4
4-7
DIV
divides
12.2
1.4
23.4
1.4
4-7
SQR
square root
9.9
1.3
35.6
1.3
3-5
NEG
negate
4.8
1.3
6.0
1.3
3-5
CLR
clear
3.4
1.1
3.9
1.1
2-3
AVE
average file
152+E25.8
30
162+E22.9
36
4-7
STD
standard deviation 262+E92.5
34
295+E85.5
34
4-7
TOD
convert to BCD
7.8
1.3
3-5
FRD
convert from BCD
8.1
1.3
3-5
RAD
radian
57.4
1.4
50.1
1.4
3-5
DEG
degree
55.9
1.4
50.7
1.4
3-5
SIN
sine
414
1.4
3-5
COS
cosine
404
1.4
3-5
TAN
tangent
504
1.4
3-5
ASN
inverse sine
426
1.4
3-5
ACS
inverse cosine
436
1.4
3-5
ATN
inverse tangent
375
1.4
3-5
LN
natural log
409
1.4
403
1.4
3-5
LOG
log
411
1.4
403
1.4
3-5
XPY
X to the power of Y 897
1.5
897
1.5
4-7
SRT
sort file
(5/11, -5/20)
(-5/30, -5/40,
-5/60, -5/80)
276 +
12[E**1.34]
224 +
25[E**1.34]
227
189
278 + 16[E**1.35]
230 + 33[E**1.35]
227
189
3-5
(1)
Use the larger number for addresses beyond 2048 words in the controller’s data table.
E = number of elements acted on per scan
SRT true is only an approximation. Actual time depends on the randomness of the numbers.
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