Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 267)

Quick Reference
Appendix C
CĆ11
Table C.J
Arithmetic Instructions
NOTE: Arithmetic instructions operate on BCD values in the data table. The word address XXX is displayed above the
instruction; the BCD value YYY which is the result of the arithmetic operation, is displayed beneath it. The BCD value is stored
in the lower 12 bits of the word address and can be any value from 000 to 999.
Displayed word addresses will be 3 or 4 digits depending on the data table size. When entering the word address, use a leading
zero if necessary.
Key Symbol Instruction Name 1770-T3 Display Rung Conditions
-( + )- Add XXX
-( + )-
YYY
The add instruction is an output instruction. It is always
preceded by two get instructions which store the BCD values to
be added.
When the sum exceeds 999, bit 14 is set. A 1 is displayed in
front of the result YYY.
-( - )- Subtract XXX
-( - )-
YYY
The subtract instruction is an output instruction. It is always
preceded by two get instructions. The value in the second get
address is subtracted from the value in the first.
When the difference is negative, bit 16 is set and a minus sign
is displayed in front of the result YYY.
-( X )- Multiply XXX XXX
-(X)-(X)-
YYY YYY
The multiply instruction is an output instruction. It is always
preceded by two get instructions which store the values to
be multiplied.
Two word addresses are required to store the 6 digit product.
-( ÷ )- Divide XXX XXX
-( ч )-( ч )-
YYY YYY
The divide instruction is an output instruction. It is always
preceded by two get instructions. The value of the first is
divided by the value of the second.
Two word addresses are required to store the 6 digit quotient.
its decimal point is placed automatically by the
industrial terminal.