Introduction.

Workshop PG5 Exercise Chapter 4
8. Remove MainControl from the left column. This can be done by highlighting
the symbol in the left column and pressing delete. It will still be listed in the
symbol list. If you highlight it in the symbol list and delete, it will delete it
completely. (Note: symbols in the symbol list, do not have to be used in the
program).
9. Click on the line mode icon and make the connections as follows:
A. Connect input4 to Clr of the counter.
B. Connect input5 to Up of the counter.
C. Connect input3 to Max of the counter.
D. Connect Cnt of the counter to the top pin of all 4 comparaters.
E. Connect Input0 to the other pin of the first comparater, Input1 to the
open pin of the second comparater ect. Yes, Input3 goes to both Max
of the counter and to the comparater.
Your program should look similar to the drawing below.
Build and download the program. Go online and activate the run mode.
Toggle input 5 on and off, and observe the Leds, 32, 33, 34, and 35.
Every time you toggle input 5 on and off, the counter increments and the comparater
that matches the counter number, activates it’s output. The counter is set up to
count 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, ect,
XOR Gates:
The next function we are going to cover, is the exclusive OR gate. This is in the
binary family. Open the F-box selector, and activate the exclusive OR symbol.
© Saia-Burgess Controls Ltd. Page 4E-7