Siemens NAN 67 Series Manual de Serviço descarregar pdf (Página 280)

B-14

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

C79000-G7076-C504-02

B.6 Word Logic Instructions

The operator of the oven shown in Figure B-12 starts the oven heating by

pushing the start push button. The operator can set the length of time for

heating by using the thumbwheel switches shown in the figure. The value

that the operator sets indicates seconds in binary coded decimal (BCD)

format. Table B-7 lists the components of the heating system and their

corresponding absolute addresses used in the sample program shown in

Figure B-13.

Table B-7 Heating System Components and Corresponding Absolute Addresses

System Component

Absolute Address in STL Program

Start push button I 0.7

Thumbwheel for ones I 1.0 to I 1.3

Thumbwheel for tens I 1.4 to I 1.7

Thumbwheel for hundreds I 0.0 to I 0.3

Heating starts Q 4.0

7....

Oven

1 0 0 1 0 0 0 1X X X X 0 0 0 1

Heat

Q 4.0

Thumbwheels for setting BCD digits

IW0

44 4

Start push button I 0.7

IB1IB0 Bytes

Bits7......0 ...0

Figure B-12 Using the Inputs and Outputs for a Time-Limited Heating Process

Heating an Oven

Programming Examples

1 2 ... 275 276 277 278 279 280 281 282 283 284 285 ... 317 318

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Siemens NAN 67 Series Manual de Serviço Página 280