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

Page 17

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Programming

Chapter 3

3Ć9

Figure 3.4

AF1 Addition Function Format After Execution

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

S

0

2

Bit No

Data Address

Operand 1

Operand 2

S

Result Address

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)

11483

Word 201

Word 202

Word 203

Word 204

Word 305

Word 306

(0)

S

(0)

1

4

6

7

5

6

2

8

4

3

5

9

3

3

0

1

(0) (0) (1) (0)

Entry and Display of Input and Result Values

Figure 3.5 shows one method for inserting input values and displaying input
values and results of AF1 addition computations. Although there are several
techniques for accomplishing this, we chose get instructions. The first rung
requests an AF1 addition. The second rung shows the two operands in its top
branch and the resultant sum in its lower branch.

Figure 3.5

AF1 Addition Function Input and Result Display Rungs

Bit

Storage

204

384

G

203

256

G

202

746

G

201

102

G

305

359

G

306

130

G

Execute Aux

Function

Function Number:
Data Addr:
Result Addr:

01

201
305