Siemens SIMATIC S7-200 Manuale - Pagina 31

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More exercises

5.1

First program modification

5.1.1

AND logic operation

Objective: Switch S2 and switch S0 must be

closed to switch on the fan motor.

As before, switch S1 is closed to reverse the

direction of rotation of the fan motor.

A description of the function shown above:

The motor runs when S0 AND S2 are

closed. In ladder diagram that means:

when contacts I0.0 AND I0.2 are closed,

current flows from the power rail to coil Q0.0.

The contacts are connected in series (AND logic). In the ladder program, the logic is

expressed as follows:

We do not need to wire switch S2, since it is

already connected to input I0.2 via the

simulator. The next page describes how to

select, insert, and delete a logic gate, and

how to name the operands.

Getting Started - Beginners

Training Documents, 07/2007, A5E01031470B

Circuit without PLC

Ladder diagram of the circuit