Adding additional inputs and outputs to FBD elements (S7-1200, S7-1500) - STEP 7

Introduction

You can expand several FBD elements with additional inputs that execute arithmetic or binary operations. Such elements are, for example, the instructions "Add" (ADD), "Multiply" (MUL), AND or OR. You can expand the "MOVE value" (MOVE) and "Demultiplex" (DEMUX) instruction boxes by adding additional outputs.

The name of the new inputs and outputs is comprised of the type of inserted element and a consecutive number. The name of a new input is may be "IN2"; the name of a new output may be "OUT2".

Requirements

An FBD element is available that permits the insertion of additional inputs and outputs.

Inserting an additional input

To add an additional input to the box of an FBD element, follow these steps:

1. Right-click on an existing input of the FBD element.

2. Select "Insert input" in the shortcut menu.

   An additional input is added to the box of the FBD element.

Or:

1. Click on the yellow star symbol beside the last input in the instruction box.

   An additional input is added to the box of the FBD element.

Inserting an additional output

To add an additional output to the box of an FBD element, follow these steps:

1. Right-click on an existing output of the FBD element.

2. Select "Insert output" from the shortcut menu.

   An additional output is added to the box of the FBD element.

Or:

1. Click on the yellow star symbol beside the last output of the instruction box.

   An additional output is added to the box of the FBD element.