0:04
One of the most common and foundational
0:06
examples of latter logic programming
0:08
involves designing a motor start stop
0:10
circuit that utilizes latching or CLIN
0:12
logic. This specific scenario not only
0:15
serves as a practical exercise but also
0:17
encapsulates several critical principles
0:19
of programmable logic controller PLC
0:21
programming as well as the broader realm
0:23
of industrial control systems. By
0:26
exploring this example, we can gain
0:27
insights into circuit design, relay
0:29
actuation, and the mechanisms that
0:31
enable machinery to operate efficiently
0:33
and safely. Detailed information
0:36
contained in this video can be found at
0:39
A link has been put in the description
0:41
below. If you have not watched the other
0:43
videos yet, there will be links in the
0:45
description below that will start you at
0:46
video one. There will be links to the
0:49
rest of the videos in this series as
0:50
well. Why is this question so common?
0:55
shows the cyclical scan of the PLC. The
0:58
reason that the inputs and outputs are
0:59
activated or deactivated in the program
1:02
is because of the PLC scans cyclical
1:04
nature which continuously updates the
1:07
inputs and outputs. It demonstrates
1:09
basic logic utilizing a simple
1:11
combination of and and or operations
1:14
which are fundamental to most ladder
1:17
Introducing latching. The seal in
1:19
circuit utilizes the motor's output
1:20
contact to maintain the circuit flow
1:22
after the start button is released. This
1:24
concept is fundamental in
1:26
differentiating PLC logic from a simple
1:28
momentary switch. Tests the knowledge of
1:30
contacts requiring both normally open
1:33
for the start button and sealin and
1:35
normally closed for the stop and/or
1:37
emergency button contacts. If you are
1:40
enjoying this video, please hit the like
1:42
button below. Keeping up with all the
1:43
latest automation innovations can be
1:45
difficult, so hit the subscribe button.
1:48
Remember to hit the bell beside your
1:50
subscription to receive the
1:51
notifications. The safety component is
1:53
vital. A normally closed button, which
1:55
is wired in series with the start logic,
1:58
serves as an essential safety feature by
2:00
breaking the circuit when the button is
2:02
pressed. This design also highlights the
2:04
importance of failsafe principles. If a
2:06
wire connected to the normally closed
2:08
stop button breaks, the motor will shut
2:10
down automatically. The question can be
2:12
made more complex by adding additional
2:14
requirements such as including a timer,
2:17
a counter or an alarm light. But the
2:18
fundamental start stop circuit remains
2:20
the most frequent starting point for
2:22
latter logic examples. To see how we
2:25
incorporate a jog into this circuit,
2:26
click here. Click here to learn how you
2:28
can learn PLC programming easily with
2:30
the machine simulator by Nertk.
