Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 198)

EAF Logarithmic, Trigonometric
and FIFO Instructions
Chapter 15
15-5
Keystrokes
Enter an EAF input and result rung (like Figure 15.3) by performing the
following steps.
1. Press .
2. Enter the result branch with its four Gets. Press and enter the
operand with its four Gets.
3. Enter the values for the Operand.
4. Complete the parallel branches.
5. Press [Shift] [EAF].
6. Enter the appropriate function number (Table 15.A).
7. Enter the data and result addresses.
ATTENTION: Do not enter data in hexadecimal. Enter all data
in BCD. Failure to observe this warning could cause unwanted
machine motion and may injure personnel.
The EAF log instruction is a feature of the Mini-PLC-2/17 processor only.
Word formats for log
10
or the log
e
are the same. The only difference
between the two EAFs is their function number: log
10
is 30 and the log
e
is 31.
log
10
xxx xxx . xxx xxx = 000 00y . yyy yyy
log
e
xxx xxx . xxx xxx = 000 0yy . yyy yyy
Enter an EAF rung like that in Figure 15.4
Figure 15.4
EAF Log to Base 10 Function, Operand and Result Rung
060
EXECUTE AUX
FUNCTION
FUNCTION NUMBER:
DATA ADDR:
RESULT ADDR:
30
040
060
G
061
G
062
811
G
063
572
G
040
000
G
041
648
G
042
000
G
043
000
G
000 002
Log to Base 10 or Log to
Base e