Rockwell Automation 1760 Pico GFX-70 Controllers Quick Start - Manual (Page 23)

1 Publication 1760-QS002A-EN-P - April 2004
Chapter
4
Lesson 3
Adding Rungs and Drawing
Connections Now let us focus entirely on our solution. Light barrier S3 supplies
count pulses via I3 for the packages that are transported on the
conveyor belt. These are connected to the C input of Counter 1 for as
long as the motor is running. The Reset condition for Counter 1 is
present when the motor stops (Q1 = 0). The extended circuit diagram
looks as follows:
Remember that the conveyor belt should stop after the maximum
number of transported packages has been reached. As soon as the
setpoint value of 5 is reached, the output of Counter 1 is set and thus
supplies the required signal. The counter is assigned parameters in a
similar way to timing relay T1. The following figure shows the
Properties field for the counter relay parameters.