Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 169)

Chapter
13
13-1
ThreeĆDigit Math Instructions
This chapter explains the three-digit math instructions.
Your processor can perform four operations using three-digit math:
addition
subtraction
multiplication
division
These operations are not signed functions.
Addition
Reports the sum of two values from the two Get instructions immediately
preceding the addition instruction. Programmed in the output position of
the ladder diagram rung. The sum is stored in the add instruction
word address.
032
700
G
030
320
G
031
380
+
When the sum exceeds 999, the overflow bit (bit 14) in the add instruction
word is set. When the processor is operating in the Run/Program, Run, or
Test mode, the overflow condition is displayed on the industrial terminal
screen as a “1” preceding the sum.
If an overflow value (four digits) is used for subsequent comparisons or
other arithmetic operations, inaccurate results could occur.
032
1998
G
030
999
G
031
999
+
Chapter Objectives
ThreeĆDigit Math