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14-10

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

C79000-G7076-C504-02

14.8 Ones Complement Integer

The Ones Complement Integer instruction reads the contents specified in the

input parameter IN and performs the Boolean word logic instruction

Exclusive Or Word (see Section 15.6) masked by FFFF

, so that every bit is

changed to its opposite value. The output parameter OUT provides the result.

ENO and EN always have the same signal state.

Certain restrictions apply to the placement of the Ones Complement Integer

conversion box (see Section 6.1).

Table 14-8 Ones Complement Integer Box and Parameters

LAD Box Parameter Data Type Memory Area Description

INV I

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

INV

EN ENO

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

IN OUT

IN INT I, Q, M, D, L Input value

OUT INT I, Q, M, D, L Ones complement integer

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write x – – – – x 1 x x

I 0.0

If the signal state of input I 0.0 is 1, the

conversion is executed. Every bit in MW8

is reversed.

MW8 = 00000000 00000000 →

MW10 = 11111111 11111111

If the conversion is not executed, the signal

state of output Q 4.0 is 1 (ENO = EN).

Q 4.0

INV_I

EN ENO

MW10INMW8

NOT

OUT

Function is executed (EN = 1):

Figure 14-8 Ones Complement Integer

Description

Move and Conversion Instructions

1 2 ... 183 184 185 186 187 188 189 190 191 192 193 ... 317 318

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