OPTOCONTROL USER'S GUIDE - Opto 22

QUICK START
Let’s take a closer look at what this chart does. Even without its descriptive comments, it’s easy
to see that this program segment begins by starting a conveyor belt. If the belt is not running at
the correct speed, the process goes into a loop until the speed is correct. When it is correct,
dough is dropped on the belt, and then chips are dropped on the dough. The process then loops
back to re-evaluate the conveyor speed, waiting if it’s incorrect, and dropping more dough and
chips if it’s correct.
The rectangular-shaped blocks are called action blocks. They do things. The diamond-shaped
blocks are condition blocks. They decide things. Charts may also have oval-shaped blocks called
continue blocks, which route the program logic back to another block in the same chart.
Connections link the blocks together and show how the program logic flows. Action blocks exit
through just one connection, since they always go in one direction. Condition blocks exit through
two connections, one for a true evaluation and the other for a false evaluation.
Opening a Block
Let’s see what’s in a block.
1. Double-click the Drop Dough block.
The Instructions dialog box appears:
This block contains three instructions: Turn On, Delay (Sec), and Turn Off. Each one has a
description above it.
2. Double-click the first instruction (Turn On) to see more about it. (You could also click it once
and click Modify.).
1-8 OptoControl User’s Guide