Siemens SIMATIC S7-200 Manuale - Pagina 35

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5.2

Second modification to the program

5.2.1

OR logic operation

Objective:

Switches S0 and S2 are to be actuated in

order to switch on the motor. Switch S3

alone is to be used as an alternative in order

to switch on the motor. Switch S1 is to be

used to reverse the direction of rotation of

the motor.

A description of the function shown above:

When (S0 AND S2) OR S3 are actuated, the motor runs. In the ladder diagram that means:

when contacts I0.0 AND I0.2 or I0.3 are closed, current flows from the power rail to coil

Q0.0. This is a parallel connection from S0 and S2 to S3 (OR logic operation). In our

program, the logic is expressed as follows:

We do not need to wire switch S3, since it is

already connected to input I0.3 via the

simulator. The next page describes how to

select and insert an OR logic gate with a

connecting line.

Getting Started - Beginners

Training Documents, 07/2007, A5E01031470B

5.2 Second modification to the program

Circuit without PLC

Ladder diagram of the circuit

More exercises