Phoenix Contact 2701399 NLC-START-01 NANOLINE STARTER KIT NPN-TRANSISTOR 2701399 Ficha De Dados

PHOENIX CONTACT

The Control block is the most basic building block of a flow chart. It is one of the action 

blocks of the nanoNavigator (see “Types of Action Blocks” on page 2-10). Its job is to do the 

discrete actions listed in its expression list. A Control block is capable of setting bits On or 

Off (flags or outputs), and doing internal timer or counter operations.

Use the “Control Block” dialog box to select the action(s) for the control block:

–

Turn a Flag or Output on or off

–

Pulse or Flash an Output (where a pulse turns off after a specified duration, and a flash 

cycles on and off at a 50% duty cycle until it is either turned off or on)

–

Start, stop, reset, or restart a Timer

–

Increment, Decrement, or reset a counter

The “Control Block” dialog box can contain up to four actions, which the nanoLC executes 

in list order. Double-click the Control block to edit its expression. This displays the “Control 

Block... Configuration” tab (see Figure 4-5).

Figure 4-5

“Control Block... Configuration” tab

Unlike ladder logic, these actions are latched. In other words, when turning an output on, 

it stays on until the flow chart (or another flow chart) turns it off. The only exception is the 

pulse output, which automatically turns off after the specified duration (entered in the Data 

Item grid), and the Flash Output action, which causes the Output to turn on and off at the 

configured period until the output is turned off.

A Pulse output with a duration of 0 (zero) causes the output to be on for a single scan only.