Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Instrukcja Użytkownika Pobierz pdf (Strona 179)

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Appendix A

A10

Table A.G

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 0r 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 instruc tion 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. A1 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

-(x)-

YYY

The multiply instruction is an output instruciton. 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

YYY

The divide instruction is an output instruciton. It is always preceded ny two

get instructions. The vlue 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.

1 2 ... 174 175 176 177 178 179 180 181 182 183 184 ... 214 215

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