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15-4

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

15.3 WAnd Double Word

A 1 at the Enable (EN) input activates the (Word) And Double Word

instruction. This instruction combines the two digital values indicated in

inputs IN1 and IN2 bit by bit, according to the And truth table. The values

are interpreted as pure bit patterns. The result can be scanned at the output

OUT. ENO has the same signal state as EN.

The relationship of the result at output OUT to 0 affects condition code bit

CC 1 of the status word as follows:

S If the result at output OUT is not equal to 0, condition code bit CC 1 of

the status word is set to 1.

S If the result at output OUT is equal to 0, condition code bit CC 1 of the

status word is 0.

Certain restrictions apply to the placement of word logic boxes (see

Section 6.1).

Table 15-2 (Word) And Double Word Box and Parameters

LAD Box

Parameter Data Type Memory Area Description

WAND DW

EN BOOL I, Q, M, D, L Enable input

WAND

EN ENO

ENO BOOL I, Q, M, D, L Enable output

IN1

EN ENO

IN1 DWORD I, Q, M, D, L First value for logic operation

IN1

IN2

IN2 DWORD I, Q, M, D, L Second value for logic operation

IN2 OUT

OUT DWORD I, Q, M, D, L Result of logic operation

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write 1 x 0 0 – x 1 1 1

I 0.0

A signal state of 1 at input I 0.0 activates the instruction.

Only bits 4 to 11 are important; the rest of memory double

word MD4 is masked:

IN1 = 0101010101010101 0101010101010101

IN2 = 0000000000000000 0000111111111111

OUT = 0000000000000000 0000010101010000

The signal state of output Q 4.0 is 1 if the operation is

executed.

Q 4.0

WAND_DW

IN2

OUT

EN ENO

DW#16#FF0

MD4

IN1MD0

Function is executed (EN = 1):

Figure 15-2 (Word) And Double Word

Description

Word Logic Instructions

1 2 ... 195 196 197 198 199 200 201 202 203 204 205 ... 317 318

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