Basic PLC Ladder Programming Training Example 14 : 24 Hour clock using Counter PLC Ladder Program
Basic PLC Ladder Programming Training Examples for Beginners. Hi Friends here we are starting a series of Free Training on PLC Ladder Programming. These PLC Ladder Programs are important to get basics of Ladder Programs
PLC Ladder Practice Problem:
- Using 3 counters together with the flag of M1013 (1s clock pulse) to operate a 24-hour clock.
Topics Covered in this example is use of Counter in PLC Program
Number of PLC Counter Required
C0 - count per second
C1- count per minute
C2 - count per hour
Number of PLC internal memory flag Required
M1013 - 1s clock
PLC Ladder Programming:
PLC Ladder Programming Description:
.
- The key of operating a 24-hour clock is to use M1013 (1s clock pulse). When the program is executed, C0 will count once per second. When the counted number reaches 60(1 minute), C0 = ON. C1 will count once, and C0 will be reset at the same time; similarly, when the counted number in C1 reaches 60(1 hour), C1 = ON. C2 will count once, and C1 will be reset at the same time. Furthermore, when the present value in C2 reaches 24, C2 will be reset, and the 24-hour counting process will start again.
- The 24-hour clock operates by using C0 to count �second�, C1 to count �minute� and C2 to count �hour.� In this clock, the value of �second�, �minute� and �hour� can be read by C0, C1 and C2 correspondingly. When the set value of C2 is 12, the clock will be a 12-hour clock.
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