Phoenix Contact 2701027 NLC-050-024D-06I-04QTP-00A nanoLine Base Unit 24ßV/DC / PNP 2701027 Data Sheet
Product codes
2701027
Getting Started and Tutorial
2373_en_B
PHOENIX CONTACT
2-11
Types of Branching Blocks
Branching blocks (both Decision and Compare blocks) perform a test and determine which
of two paths to take after the test. Each branching block has one entry point and two exit
points indicating Yes and No paths from the block. By default, the bottom connector is the
Yes path, and the right side is the No path.
Both Decision and Compare blocks appear as diamonds in the flow chart (see Figure 2-7).
Figure 2-7
Decision and Compare blocks appear as diamonds
Decision blocks examine the state of a data item using a Boolean comparison. For example,
a Decision block can test inputs or outputs to determine if they are ON or OFF or
transitioning from one state to the other. A Decision block can have one or two decision
expressions. If there are two expressions, an OR or AND condition links them. For example,
a Decision block could have the following expressions:
–
Input1 ON AND Input2 OFF
Use Compare blocks to compare two data items. For example, a Compare block can
compare an integer register value to a constant or another register. A Compare block can
compare values using one of the following comparison operators:
2.4.3
Data Items
Data items provide labels for inputs, outputs, timers, messages, and internal storage. In
nanoNavigator, the Data Item Editor labels data items (up to 30 characters). Data items
appear in flow chart blocks to control a project. Each label “personalizes” the item (timer,
counter, etc.), output (valve, motor, LED, etc.), or monitor (pressure gauge, flow meter,
switch, etc.). Personalizing data items helps identify an item’s purpose whenever it’s used
in a flow chart block. Therefore, make sure the label (or name) reflects the purpose of the
The standard orientation of flow chart is top-to-bottom for ease in reading.
= (Equal To)
> (Greater Than)
< (Less Than)
>= (Greater Than or Equal To)
<= (Less Than or Equal To)
IsEven (doesn’t have a second data item to compare to)