B. School Bell Application
Figure 6. School Bell Wiring Diagram.
Objective: To ring school bells for three seconds on a
preprogrammed schedule.
Using channel 2, suppose you want the bells to ring for three
seconds on the following schedule: 7:50, 8:00, 8:50, 9:00,
9:50, 10:00.
Step
Key
Description
1
PRG
“cir” is displayed (if set points were previously
programmed, press E key until “cir” appears).
2
2
Key in circuit number.
3
E
Enters circuit number.
4
0, 7,
Key in time for first bell.
5, 0
5
2, 3, 4, Key in weekdays (display continues to roll
5, 6
through each number selected).
6
TYP
Press this key three times; a flashing dash
appears on the lower right of display, indicating
a pulse (momentary contact) event.
7
E
Enters set point.
Repeat steps 2-7, substituting 8:00, 8:50, 9:00, 9:50, and
10:00 in step 2.
8
RUN Exits programming mode; time and day dis-
played.
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