Rockwell Automation 1760 Pico GFX-70 Controllers Quick Start - Manual (Page 7)

Publication 1760-QS002A-EN-P - April 2004
Overview of Course 1 1-3
Task Definition for Course 1 The example procedures will refer to the following system.
A conveyor belt system that is driven by a three-phase motor is to start
up with a delay of 3 seconds after it has been switched on. The
conveyor belt is used for transporting packages. Once a certain
number of packages have been transported, the system should switch
off after a specified rundown time.
In our example, the number of packages to be transported is 5 and a
rundown time of 4 seconds is set. The system is switched on via S1. S2
switches off the system immediately and light barrier, S3, is used to
detect the number of packages that have already been transported.
Inputs
S1: Switch on system (make contact)
S2: Switch off system (break contact)
S3: Light barrier (make contact)
Outputs
K1: Contactor for switching the three-phase motor
Parameters
T1: Startup delay (3s)
T2: Switch-off delay (4s)
C1: Number of packages (5 pieces)