Phoenix Contact 2701030 NLC-050-024D-06I-04QTN-00A nanoLine Base Unit 24ßV/DC / NPN 2701030 Data Sheet
Product codes
2701030
Getting Started and Tutorial
2373_en_B
PHOENIX CONTACT
2-9
2.4.2
Flow Charts
nanoNavigator uses flow charts to design control programs, and nanoLC executes projects
that use flow chart control programs. The symbols in the flow chart depict two classes of
items: action blocks and branching blocks.
Action Block
An action block is a box (see Figure 2-5) representing an operation on the data in the
system, which may include input or output data. In the flow chart, an action block has one
entry point (top) and one exit point (bottom). nanoNavigator has four types of action blocks
that are described later (see “Types of Action Blocks” on page 2-10).
Figure 2-5
Flow chart segment showing an action and branching block
Branching Block
A branching block is a diamond-shaped box (see Figure 2-5) that represents a branch in the
control path based on available data. A branching block may compare one variable to
another, a variable to a constant, or a true or false condition. Branching blocks have one
entry point (top) and two exit points (right side and bottom). nanoNavigator has two types of
branching blocks that are described later (see “Types of Branching Blocks” on page 2-11).
Using just action and branching blocks, flow charts can have complete control of I/O
systems, or control a machine or process. A project may consist of one or several flow
charts.
Action
Block
Branching
Block
N
Y