Siemens v1.0 Manual de Serviço descarregar pdf (Página 38)

Simple example

2.4 Create program

STEP 7 Basic V10.5

38 Getting Started, 12/2009, A5E02651459-01

Negated coil

The following figure shows the icon of the "Negated coil" instruction in the program:

---( / )---

The "Negated coil" operation inverts the signal state and assigns the corresponding bit to the

specified tag (<operand>). If the signal state is "1" at the coil input, the bit is reset to "0". If

the signal state is "0" at the coil input, the bit of the tag is set to "1".

Requirements

● The project has been created.

● The PLC is configured.

● The organization block "Main [OB1]" is open.

Procedure

To create the program for switching the example machine on and off, follow these steps:

1. Activate the symbolic representation of the tag.

When the symbolic representation of the tags is activated, the addresses of the tags are

not displayed in the network.

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Siemens v1.0 Manual de Serviço Página 38