Variables - fischertechnik COMPUTING ROBO TX ElectroPneumatic Manual

COMPUTING
Tips
The position of the gripper arm can be defined with the aid of the "pulse counter" command. The values
required can be entered in the interactive window.
If the ideal position is between two pulses, you can also adjust the start or end position of the balls by
moving one or more of the building blocks so that the gripper picks up or puts down the ball reliably.
Information on the commands used is given in

Variables

Task 3 - Two balls in obstacle course - ROBO Pro Level 3
Now two balls roll through the obstacle course. Two conditions should be fulfilled to ensure that the
robot distributes the balls uniformly on the two tracks:
• Balls arriving at the bottom end points (P1 or P2) should be transported alternately to the upper
starting points (P3 or P4).
• If balls are present simultaneously at both end points (P1 and P2), they should also be
picked up alternately.
You can meet these requirements by supplementing the program.
Tips
So-called variables help to solve this problem. Information on what variables are and how they can be
used is given in the
Here is the solution:
Define a variable (Pos1 – Pos4) for each of the 4 positions P1, P2, P3 and P4. When a position is reached,
set the value for the associated variable to 1 to help you remember the position moved to last.
Example:
First ball:
Ball present at P1
Ball moved to P3
Second ball:
Ball present at P1 and P2. Since Pos1=1, the robot should now go to P2. Then Pos1 is set to 0 and Pos2
to 1. Since the ball was set down at P3 during the first operation (Pos3 = 1), the ball is now transported
to P4. Then Pos1 is set to 0 and Pos2 to 1.
Too complicated? You can call a finished example program for this task with this symbol.
Attempt to understand how the principle works by looking at the final sequence.
ROBO Pro help in Chapter 5. It is important that you switch to level 3 in ROBO Pro.
Variable
Pos1 =
Pos3 =
14
ROBO TX ElectroPneumatic
ROBO Pro help Chapters 3. and 8.1.10.
Value Variable
1 Pos2
1 Pos4
Value
= 0
= 0
ball obstacle course_3.rpp