User manual

Planning Your System Programs
Chapter 6
6-4
Organizing a Machine Example
This section uses an example of a specific machine operation to show how
to identify conditions and actions and how to group the actions into steps
of machine operation.
Figure 6.1
Hardware
Block Diagram and Description of Machine Process
FWD
Conveyor
Motor
OFF
AUTO
Advance
Assembly
Drill
Motor
NC
NO NO
LS1
LS5
FWD
Clamp
CL1
LS4LS3
LS2
Held Open
..
.. ..
NO
..
NO
..
FWD
L oad
St at i on
load
St at i on
Un
A description of this operation might be as follows:
1. The operator starts the conveyor by selecting AUTO.
2. The operator puts a block of wood onto the conveyor.
3. The wood moves into position and actuates LS1.
4. When the wood is in position:
a. the conveyor stops
b. CL1 clamps the wood
c. the drill station moves forward
5. The drill station moves forward and closes LS3. This
action turns on the drill motor.
6. The drill station moves to full depth and closes LS4. This action:
a. stops forward motion of the drill station
b. initiates a 2second dwell
7. The drill station backs up after the 2second dwell.
8. The drill motor stops when LS3 is released.
9. The drill station reaches home position and opens LS2. This action:
a. stops the reverse motion
b. opens the clamp
c. starts the conveyor forward
10. The wood is ejected when LS5 toggles to indicate that the cycle is complete.