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Programming chapter 3 – Rockwell Automation 1772-AF1,D17726.5.1 User Manual MINI-PLC-2/15 User Manual

Page 16

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Programming

Chapter 3

3Ć8

Figure 3.3

AF1 Addition Function Format After Address Entry

17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0

S

Digit 1

(MSD)

Digit 2 Digit 3

Bit No.

Data Address

Digit 5

Digit 6

Digit 4

(LSD)

Operand 1

S

Digit 1

(MSD)

Digit 2 Digit 3

Digit 5

Digit 6

Digit 4

(LSD)

Operand 2

S

Digit 1

(MSD)

Digit 2 Digit 3

Result Address

Digit 5

Digit 6

Digit 4

(LSD)

Result

D ER

E

E = Enable Bit (1 = Function in Progress)

S = Sign Bit (1= Negative)

D = Done Bit (1 = Function Complete)

ER = Error Bit (1 = Overflow)

MSD = Most Significant Digit

LSD = Least Significant Digit

11482

201

202

203

204

305

306

4. Enter values for operands 1 and 2.

You can enter these values from the keyboard of your industrial terminal or
through ladder diagram functions. Entry of operand 1 = 102746 and operand
2=256384 produces the result 359130 when the addition function executes.
Figure 3.4 shows how the result is stored.