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13-2

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

C79000-G7076-C504-02

13.1 Compare Integer

The Compare Integer instruction carries out a compare operation on the basis

of 16-bit floating-point numbers. You can use this instruction like a normal

contact. This instruction compares inputs IN1 and IN2 according to the type

of comparison you select from the browser. Table 13-1 lists the valid

comparisons.

If the comparison is true, the result of logic operation (RLO) of the

comparison is 1. Otherwise, it is 0. There is no negation of the compare

output because this logic can also be handled by the inverse compare

function.

Table 13-1 Types of Comparisons for Integers

Type of Comparison Symbols in Name at Top of Box

IN1 is equal to IN2. ==

IN1 is not equal to IN2. <>

IN1 is greater than IN2. >

IN1 is less than IN2. <

IN1 is greater than or equal to IN2. >=

IN1 is less than or equal to IN2. <=

Table 13-2 Compare Integer Box and Parameters

LAD Box Parameter Data Type Memory Area Description

CMP

IN1 INT I, Q, M, D, L First value to compare

IN1

IN2

INT

IQMDL

Second value to compare

IN2

INT

econ

o compare

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write – x x 0 – x 1 x 1

I 0.1

Output Q 4.0 is set if the following

conditions exist:

S There is a signal state of 1 at

inputs I 0.0 and I 0.1

S And MW0 = MW2

S And there is a signal state of 1 at

input I 0.2

Q 4.0

CMP

== I

IN2MW2

IN1MW0

I 0.0 I 0.2

Comparison is true:

Figure 13-1 Compare Integer

Description

Comparison Instructions

1 2 ... 169 170 171 172 173 174 175 176 177 178 179 ... 317 318

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