Siemens NAN 67 Series Manual de Serviço descarregar pdf (Página 270)

100

101

B-4

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

C79000-G7076-C504-02

You can write a program to control the conveyor belt shown in Figure B-1

using absolute values that represent the different components of the conveyor

system (see Table B-2). Figure B-2 shows a ladder logic program to control

the conveyor belt.

Table B-2 Elements of Absolute Programming for Conveyor Belt System

System Component

Absolute Address

Push Button Start Switch I 1.1

Push Button Stop Switch I 1.2

Push Button Start Switch I 1.3

Push Button Stop Switch I 1.4

Sensor I 1.5

Motor Q 4.0

I 1.1

Q 4.0

Push Button Start Switch

“S1”“S1”

Motor

“MOTOR_ON”

Push Button Start Switch

I 1.1

“S3”

I 1.3

Network 1: Pressing either start switch turns the motor on.

Network 2: Pressing either stop switch or opening the normally closed contact at the end of the belt

turns the motor off.

Q 4.0

Push Button Stop Switch

“S2”

Motor

“MOTOR_ON”

Push Button Stop Switch

I 1.2

“S4”

I 1.4

Sensor

“S5”

I 1.5

Figure B-2 Ladder Logic for Controlling a Conveyor Belt

Absolute

Programming

Programming Examples

1 2 ... 265 266 267 268 269 270 271 272 273 274 275 ... 317 318

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