Phoenix Contact 2701027 NLC-050-024D-06I-04QTP-00A nanoLine Base Unit 24ßV/DC / PNP 2701027 Data Sheet

Product codes

2701027

Flow Chart Techniques

2373_en_B

PHOENIX CONTACT

4-3

Flow Chart Techniques

This section provides an in-depth discussion of the flow charting features of nanoNavigator.

4.1

Basic Flow Chart Blocks

The first block in a flow chart is the starting point of execution. nanoNavigator automatically

creates the Enable block at the top of the flow chart when creating a new flow chart.

4.1.1

Enable Block

Each flow chart must have a beginning point, and the Enable block serves that purpose. The

Enable block is in the upper-left, grid cell A0, in a new flow chart (see Figure 4-1). It has the

following characteristics:

–

The Enable block is the first block of every flow chart. It has a single exit from which flow

passes on to the rest of the control program. The Enable block cannot be deleted,

copied, or moved on the drawing area.

Figure 4-1

Every new flow chart opens with a predefined Enable block

–

An empty Enable block (no expression created) causes a flow chart to always run.

–

Double-click the block to edit its expression.