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Mind-Blowing AI Creates Perfect PLC Start-Stop Circuit First Try?
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Feb 10, 2025
Join me as I take on the challenge of creating a simple start-stop circuit in ladder logic using DeepSeek AI—let’s see if it can nail it! Can this happen on the first try? In industrial automation, the ability to design and simulate control circuits is essential for ensuring the functionality and safety of various systems. One of the fundamental circuits used in control systems is the start-stop circuit. Today, we will explore creating a start-stop circuit using DeepSeek AI for ladder logic programming. We will enter and test this generated code using the completely free Do-More Designer Software PLC Simulator. Let's get started. More information can be obtained on our website. This includes all of the links mentioned in this video. https://accautomation.ca/deepseek-ai-start-stop-circuit-in-ladder-logic/ The entire BRX Series PLC can be found here: https://accautomation.ca/series/brx-do-more-plc/ Using AI for structured text in an LS Electric XGB PLC: https://accautomation.ca/xgb-plc-structured-text-first-program/ 00:00 DeepSeek AI Start-Stop Circuit in Ladder Logic? 00:52 What is DeepSeek? 01:25 What is a Start-Stop Circuit? 01:49 Asking if DeepSeek can program a PLC. 15:20 Correcting the Ladder Logic Circuit The entire BRX Series PLC can be found at the following location: https://accautomation.ca/series/brx-do-more-plc/ Here are the individual posts with video links:
View Video Transcript
0:02
join me as I take the challenge of
0:03
creating a Simple Start stop circuit in
0:05
ladder logic using deep seek AI let's
0:08
see if I can nail
0:09
it in Industrial Automation the ability
0:12
to design and simulate control circuits
0:14
is essential for ensuring a
0:16
functionality of safety a variety of
0:18
systems one of the fundamental circuits
0:21
used in a control system is the start
0:22
stop circuit today we will explore
0:24
creating a start stop circuit using deep
0:27
seek AI for later logic programming we
0:29
will enter and test this generated code
0:31
using completely free do more designer
0:33
software PLC simulator let's get
0:36
started detailed information contained
0:39
in this video can be found at ACC
0:45
automation.com examples making a
0:47
One-Stop shop for all your automation
0:49
queries ACC
0:58
automation.com that develops open-source
1:01
large language models
1:03
llms deep seek AI models are designed to
1:06
be more costeffective than other AI
1:08
models while still being capable of
1:10
generating human-like responses it may
1:12
provide tools or solutions that enhance
1:15
efficiency and programming or
1:16
controlling Machinery such as those
1:18
through lad logic programs used in plc's
1:21
or program logic controller
1:25
programming what is a start stop
1:28
circuit a stop start Circ circuit is the
1:30
fundamental Control process that allows
1:32
users to start and stop a motor or other
1:33
devices at will this circuit typically
1:36
involves push buttons one for starting
1:38
normally open and one for stopping
1:40
normally
1:41
closed understanding how a start stop
1:43
circuit operates is vital for anyone
1:45
working in automation as it serves as a
1:47
foundation for more complex
1:51
systems asking if AI can program a
1:56
PLC after logging into deep seek on your
1:58
browser select the Deep think R1 option
2:01
this will allow you to understand how
2:03
the AI is answering your question we
2:05
will ask can you program a bricks doore
2:08
PLC in latter
2:14
logic okay so the user is asking if I
2:16
can program a BRX do more PLC using
2:17
latter logic let me start by recalling
2:19
what I know about BRX series plcs I
2:21
remember that BX is a product line from
2:22
automation direct and the do more series
2:24
is their newer generation of plc's
2:25
designed for more advanced control
2:26
applications first I need to confirm
2:28
whether the BRX D more PLC supports
2:30
logic programming from what I've learned
2:31
most plcs especially those aimed at
2:33
Industrial Automation do support latter
2:34
logic because it's a widely used
2:35
standard but I should double check if
2:37
there are any exceptions or specific
2:38
details about the BRX series I think
2:39
automation direct provides software
2:41
called do more designer for programming
2:42
their plcs let me verify that yes do
2:44
more designer is the official IDE for
2:45
BRX do more plcs now does this software
2:47
support latter Logic the name designer
2:49
might imply a multilanguage environment
2:50
latter logic is one of the I 61131 to
2:53
three standard languages which also
2:54
include structured text function block
2:56
diagrams Etc since BX is a modern PLC
2:58
it's likely compliant with the these
3:00
standards but maybe the user is
3:01
specifically asking about latter logic
3:02
because they are more comfortable with
3:03
it I should confirm that latter logic is
3:05
not only supported but is a primary
3:06
method for programming these plcs
3:08
looking back at automation directs
3:09
documentation the BRX series does indeed
3:11
support latter logic along with other
3:12
languages the do more designer software
3:14
uses latter logic as one of its main
3:15
programming paradigms which is good news
3:17
for the user now considering the user
3:18
might be someone new to BRX plc's they
3:20
might need a basic example I should
3:21
provide a simple latter logic example
3:23
like turning on an output when an input
3:24
is activated but wait I need to make
3:26
sure about the addressing scheme for BRX
3:27
plcs for example discret inputs might be
3:29
addressed x0 X1 Etc and outputs as y0 y1
3:33
however BRX plcs might use a different
3:34
addressing convention let me check that
3:36
upon reviewing BRX PLC use a tag based
3:38
system which allows users to Define
3:39
symbolic names for inputs outputs and
3:41
other variables however they also
3:43
support direct addressing for example
3:44
inputs could be referenced as x0 X1 and
3:46
output says y0 y1 so a simple Ladder
3:48
rung would have a normally open contact
3:50
x0 in series with a coil y0 that would
3:52
make y0 turn on when x0 is activated but
3:54
the user might also benefit from knowing
3:55
how the software environment works for
3:57
instance creating a new project and do
3:58
more designer selecting the BRX model
4:00
configuring the hardware and then
4:01
writing the lad logic including steps
4:03
like compiling and downloading the
4:04
program to the PLC would be helpful
4:06
another point to consider is any
4:07
Specific Instructions or features unique
4:08
to the BRX series for example do more
4:10
plc's have advanced instructions for
4:12
motion control networking and data
4:13
handling but for a basic example
4:14
sticking with simple contacts and coils
4:16
is better I should also mention that do
4:17
more designer provides simulation
4:18
capabilities allowing users to test
4:20
their ladder logic without physical
4:21
Hardware this is useful for
4:22
troubleshooting and learning wait the
4:24
user might also want to know about
4:25
documentation or resources including a
4:26
note about automation directs website
4:28
user manuals and example projects could
4:29
be helpful but since the question is
4:31
about whether it's possible in a simple
4:32
example maybe that's beyond the scope
4:33
unless the user asks for it in summary
4:35
the answer should confirm that BRX do
4:37
more plcs can be programmed in latter
4:38
logic using dour designer provide a
4:40
basic example and mention the software's
4:41
features relevant to latter logic
4:42
programming also ensure that the example
4:44
uses the correct addressing and syntax
4:46
specific to BRX plc's yes you can
4:48
program a BRX do more PLC using ladder
4:50
logic which is fully supported by
4:51
automation directs do more designer
4:53
software here's a concise breakdown key
4:55
details software use do more designer
4:57
free download from automation direct to
4:59
write simulate and deploy ladder logic
5:01
ladder Logic support BRX plc's natively
5:03
support ladder logic LD as part of the
5:05
IEC 61131 to3 standard ideal for
5:08
Industrial Automation tasks like relays
5:10
timers counters and complex control
5:12
logic simple example turn on an output
5:14
with an input lad rung x0 input EGA
5:17
sensor or button y0 output EGA motor or
5:20
light when x0 is activated y0 energizes
5:23
steps to program create a project open
5:25
do more designer select your VX model
5:28
configure IO map physical inputs /
5:29
outputs to addresses EG x0 y0 write
5:32
logic drag and drop ladder elements
5:34
contacts coils timers simulate test
5:36
logic in the built-in emulator download
5:38
transfer the program to the PLC via USB
5:40
or ethernet Advanced features tag based
5:42
addressing use symbolic names EG start
5:45
button instead of XZ integrated
5:46
instructions timers T counters CTU P
5:49
loops and motion control networking
5:51
easily integrate with HMI Scot or other
5:54
plcs via ethernet/ip or modbus
5:56
documentation refer to automation
5:58
directs BRX manuals for detailed guid
5:59
sides and examples latter logic is a
6:01
core strength of the BRX platform making
6:03
it accessible for both beginners and
6:04
advanced
6:06
users like Gemini I was originally
6:08
impressed with deep seek AI it even
6:10
gives me a link to the automation direct
6:12
website where I can find information
6:14
about the bricks do more PLC deep seeks
6:17
thought process is interesting it allows
6:19
us to see how it tries to solve the
6:20
question which helps us understand and
6:22
learn along with the
6:24
algorithm I will now ask deep seek to
6:26
create a start stop circuit for the
6:28
bricks plc X1 is the start X2 is the
6:31
Stop and y1 is the motor
6:40
output okay the user wants a start stop
6:42
circuit for a BRX PLC using ladder logic
6:44
they specified X1 as start X2 is stop
6:46
and y1 as the motor output let me recall
6:48
how a standard start stop latch Works
6:49
typically it's a self-holding circuit
6:51
where the start button normally open is
6:52
pressed energizing the coil which then
6:54
uses a parallel contact to keep itself
6:55
on even after the start button is
6:56
released the stop button is usually
6:58
normally closed so that pressing it
6:59
breaks the circuit wait the user
7:00
mentioned X2 is a stop in plcs physical
7:03
stop buttons are often wired as normally
7:04
closed and C4 safety so in the latter
7:06
logic if the physical input is in C the
7:07
PLC will see X2 is normally High when
7:09
the stop is pressed X2 opens and the PLC
7:11
input goes low therefore in the ladder
7:13
we should use a normally open and O
7:14
contact for X2 but since the physical
7:16
input is in C the logic might need to be
7:17
inverted hm maybe I should clarify that
7:19
but the user didn't specify the type of
7:21
input contacts let me assume that X1 is
7:22
an in push button start and X2 is NC
7:24
push button stop so in the latter X2
7:26
would be a normally closed instruction
7:28
because the physical stop is in C wait
7:29
no if the physical input is in C when
7:31
the stop is not pressed the input is
7:32
active X2 is on when you press the stop
7:35
the input becomes off so in the ladder
7:36
to have the stop button act as a brake
7:38
we should use a normally closed contact
7:39
for X2 that way when the stop isn't
7:41
pressed the contact is closed allowing
7:42
current to flow when pressed the contact
7:44
opens stopping the motor so the Ladder
7:45
rung would be start X1 in O in parallel
7:47
with y1 latching in series with stop X2
7:49
and C wait no wait the standard start
7:51
stop is start and O in parallel with the
7:53
motor contact y one all in series with
7:55
stop and see wait no let me think again
7:57
the standard circuit is stop and see
7:58
contact in series with start and no
8:00
contact in parallel with the motor
8:01
contact and no contact so when you press
8:03
start the motor turns on and the
8:04
parallel contact latches it the stop is
8:06
in series so if stop is pressed it
8:07
breaks the circuit but in terms of
8:09
Latter Logic the stop button if
8:10
physically and C would be represented as
8:12
a normally closed instruction X2 so the
8:14
rung would be X2 and C X1 and0 y1 and O
8:17
in parallel with X1 then y1 coil wait
8:19
maybe I need to draw it out let me
8:20
structure it step by step the correct
8:21
ladder structure for a start stop
8:22
latches the stop button X2 is a normally
8:24
closed and C contact the start button X1
8:27
is a normally open and O contact the
8:28
motor contact y1 is in parallel with X1
8:30
to latch the circuit so the rung would
8:33
be wait no let me correct that the
8:36
correct structure is the stop is in
8:37
series with a combination of start in
8:38
parallel with the motor contact so the
8:40
stop X2 and C is the first element then
8:42
in parallel the start X1 and0 and the y1
8:44
and O contact then the y1 coil so the
8:46
latter rung would look like in latter
8:48
logic notation that would
8:50
be wait maybe I'm mixing up the drawing
8:52
let me try to represent it correctly the
8:53
stop X2 and C is in series with the
8:55
start X1 and0 and the latching contact
8:57
y1 and0 in parallel so the rung is X2
8:59
and C contact then a branch where One
9:01
path is X1 and O and the other is y1 and
9:03
O in parallel then the y1 coil so in
9:05
latter logic
9:08
it's wait no the y1 contact should be in
9:10
parallel with X1 so the correct way is
9:13
wait that's not right let's break it
9:14
down the current flows through X2 and C
9:16
then either through X1 and o or y1 and O
9:18
in parallel so the structure is X2 and C
9:20
is in series with a parallel combination
9:22
of X1 and O and y1 and0 then the y1 coil
9:24
so in latter logic but that's not
9:27
correct wait maybe the correct way is
9:28
the X2 and C contct is first then a
9:30
branch starts where One path is X1 and O
9:32
and the other path is y1 and O both
9:33
paths are in parallel after that the y1
9:35
coil so the rung would
9:38
be yes that's right so the stop X2 and C
9:41
is in series with the parallel
9:42
combination of start X1 and O and y1 and
9:44
O then the y1 coil so when X2 is closed
9:46
stop not pressed pressing X1 start
9:48
energizes y1 which then keeps itself
9:50
energized through its own contact
9:51
pressing X2 stop opens the X2 contact
9:53
breaking the circuit but in terms of
9:54
Latter logic elements the X2 is
9:56
represented as a normally closed
9:57
instruction forward slash X1 is nor open
10:00
and y1 contact is normally open in
10:01
parallel with X1 so the final Ladder
10:03
rung should look like wait no the y1
10:05
contact is in parallel with X1 so after
10:07
X2 the path splits into two one through
10:09
X1 the other through y1 then they merge
10:10
and go to the coil so the correct
10:12
representation is this seems correct
10:13
when X2 is closed stop not pressed
10:15
either X1 or y1 can keep y1 energized
10:16
pressing X1 start energizes y1 and y1
10:18
stays on by its own contact pressing X2
10:19
stop opens the X2 contact the energizing
10:20
y1 I should also mention that in the BRX
10:21
PLC the inputs and outputs are map is x0
10:23
X1 etc for inputs and Y Z y1 for outputs
10:25
so using X1 is start and O X2 is stop
10:26
and c and y1 as the motor output is
10:28
correct additionally it's important to
10:29
know that the the stop button X2 is
10:30
wired asn't see for safy reasons if the
10:31
wire breaks the PLC will see it as a
10:32
stop condition which is safer than in
10:33
contact where a broken wire wouldn't
10:34
trigger a stop so putting it all
10:35
together the ladder room for the start
10:36
stop circuit should be as described let
10:37
me make sure there are no errors let me
10:37
simulate mentally when X2 is not pressed
10:39
and C so contact is closed and X1 is
10:40
pressed and no contact closes y One
10:41
turns on y one's contact closes latching
10:42
the circuit even when X1 is released y
10:44
one stays on through its own contact
10:45
when X2 is pressed contact opens the
10:46
circuit breaks y1 turns off and it's
10:47
contact opens when X2 is released
10:48
contact closes again y1 remains off
10:49
until X1 is pressed again yes that's
10:50
correct so the lad logic is accurate
10:52
here's the start stop lat circuit for
10:53
the BRX PLC using ladder logic this
10:55
classic sealin circuit keeps the motor y
10:57
one running after the start button X1 is
11:00
released and stops the motor when the
11:01
stop button X2 is pressed lad logic
11:04
diagram explanation stop button X2
11:06
physically wired as a normally closed
11:08
and C button for safety open when
11:09
pressed represented as X2 with a
11:11
normally closed contact forward slash in
11:13
the ladder logic start button X1
11:15
physically wired as a normally open and
11:17
o button closed when pressed represented
11:19
as X1 with a normally open contact motor
11:21
output y1 the output coil y1 is
11:23
energized when the circuit is closed a
11:25
self-sealing latching contact y1 in
11:27
parallel with X1 keeps y1 ized after X1
11:30
is released Behavior start when X1 is
11:32
pressed current flows through X2 closed
11:34
and X1 closed energizing y1 latch once
11:37
y1 is energized its parallel contact
11:39
closes maintaining the circuit even
11:40
after X1 is released stop when X2 is
11:43
pressed its contact opens breaking the
11:45
circuit and de energizing y1 key notes
11:47
safety the stop button X2 is Inc in
11:50
Hardware to ensure the motor stops if
11:51
the circuit loses power or wire braks
11:53
addressing use symbolic tags EG start
11:55
stop motor and do more designer for
11:56
readability debouncing add timers a
11:58
physical buttons cause noise not
12:00
typically needed for basic setups
12:02
testing and do more designer open the
12:03
software and configure your BX PLC model
12:06
assign X1 start X2 stop and y1 motor in
12:09
the io mapping program the Ladder rung
12:10
above simulate using the built-in
12:12
emulator to verify the latch / unlatch
12:14
Behavior download to the PLC and test
12:16
with physical buttons for more details
12:18
refer to the BRX user manual this
12:19
circuit is foundational for motor
12:20
controls Conveyor Systems and other
12:22
Industrial Automation
12:24
tasks if we try this in the bricks do
12:27
more designer PLC simulator we you can
12:29
turn the output on but we you cannot
12:31
turn it
12:33
off if you are enjoying this video
12:35
please hit the like button below keeping
12:37
up with the latest automation
12:39
Innovations can be difficult so hit the
12:40
Subscribe button remember to click the
12:42
Bell beside your subscription to
12:44
actually receive those
12:46
notifications let's see if deep SE can
12:48
modify the program for the correct
12:50
ladder Logic for the start stop
12:52
circuit the ladder circuit diagram is
12:57
incorrect okay the user set the lad
12:59
circuit diagram I provided is incorrect
13:00
let me double check what I wrote in my
13:01
previous response the ladder logic was
13:02
drawn with X2 stop as a normally closed
13:04
contact X1 start as normally open and y1
13:06
in parallel with X1 that should create a
13:07
seal in circuit wait but maybe the way I
13:09
drew the rung is structurally wrong in
13:10
latter logic terms let me visualize it
13:11
again the user is using a BX PLC so the
13:13
contacts and coils need to follow the
13:14
correct syntax the stop button x two is
13:16
typically a normally closed and C
13:17
physical button so in the latter logic
13:18
it should be represented as a normally
13:19
open and0 contact because when the
13:20
button is not pressed the circuit is
13:21
closed Wait no that's a common confusion
13:23
let me clarify physical NC stop button
13:24
wired to the PLC input when the button
13:26
is not pressed the input is active on
13:27
and when pressed the input is off so so
13:29
in the latter logic to have the stop
13:30
button act as a break we should use a
13:31
normally closed andc contact symbol
13:32
forward slash which will open when the
13:33
input X2 is activated button pressed so
13:35
when X2 is pressed the contact opens
13:36
breaking the circuit that part seems
13:38
right but maybe the way the parallel
13:39
branch is drawn is incorrect In latter
13:40
Logic the sealing contact y1 should be
13:41
in parallel with X1 so the start button
13:43
X1 and O and y1 and O are in parallel
13:44
both in series with the stop button X2
13:46
and C wait no the standard start stop
13:47
circuit has the Stop and C contact in
13:48
series with the start and no contact and
13:50
the ceiling contact let me sketch it
13:51
mentally the main rung should be stop X2
13:53
and C contact in series with a
13:54
combination of start X1 and O in
13:55
parallel with y1 and O contact then
13:57
driving the y1 coil so the structure is
13:58
X2 and C X1 and O y1 and O y1 coil but
14:01
in latter Logic the parallel branch is
14:02
created by a branch around the X1
14:03
contact so the correct diagram would
14:05
have X2 and C in series with X1 and O
14:06
then a branch around X1 that has y1 and
14:08
O then the y1 coil let me confirm with a
14:09
standard start stop
14:11
ladder you're absolutely right my
14:13
initial ladder diagram had an error in
14:14
the y1 contact type incorrectly shown as
14:16
normally closed instead of normally open
14:18
let me provide the corrected circuit
14:20
with a clear explanation corrected start
14:21
stop ladder
14:23
logic step-by-step explanation stop
14:25
button X2 Hardware physically wired as a
14:27
normally closed NC button opens when
14:29
pressed lad logic represented as a
14:31
normally closed contact forward slash
14:34
this ensures the motor stops if the
14:35
button is pressed or if there's a wiring
14:36
fault start button X1 Hardware
14:39
physically wired as a normally open and
14:40
o button closes when pressed ladder
14:42
logic represented as a normally open
14:44
contact sealing contact y1 function a
14:47
normally open and no contact of y1 in
14:49
parallel with X1 when y1 energizes this
14:51
contact closes creating a self
14:53
sustaining circuit latching motor output
14:55
y1 energizes when the circuit is closed
14:56
and de energizes when the circuit breaks
14:58
Behavior starting the motor press X1 the
15:01
circuit closes through X2 closed and X1
15:03
closed y1 energizes y1 inoc contact
15:05
closes latches the circuit even after X1
15:07
is released stopping the motor press X2
15:09
X2 zenc contact opens the circuit breaks
15:11
y1 de energizes y1 Zeno contact reopens
15:14
unlatches the circuit key fixes from
15:16
previous diagram y1 contact type change
15:18
from forward slash n C2 and no to enable
15:21
proper latching parallel Branch logic
15:23
ensures why one's contact is in parallel
15:24
with X1 not in series testing and do
15:27
more designer assign addresses X 1
15:29
equals start and no physical button X2
15:31
equals stop and C physical button y1
15:33
equals motor output simulate use the
15:35
emulator to verify press X1 y1 stays on
15:37
after releasing X1 press X2 y1 turns off
15:40
why this works safety X2 breaks the
15:42
circuit when pressed fail safe design
15:44
latching y1 Zen contact seals the
15:46
circuit eliminating the need to hold X1
15:48
thank you for catching that error let me
15:50
know if you need further
15:53
clarification deep seek still has the
15:55
Simple Start stop lad logic incorrect in
15:57
a circuit diagram for the Logic the stop
16:00
X2 or normally closed should be outside
16:02
the ceiling contact from the start X1
16:05
normally closed
16:06
input here's a modification required in
16:09
the ladder logic programming software
16:11
although we were not able to get deep
16:12
seek to create the ladder logic it was
16:14
interesting to see how the logorithm
16:16
tried to solve the
16:19
problem five languages can be used to
16:21
program plc's using the IEC 611 31-1
16:25
standard AI large language models llm
16:29
using textual languages seem better
16:32
suited over graphical control structured
16:35
text and instruction lists are the two
16:37
textual PLC programming
16:41
languages we recently used AI to program
16:43
the ls electric xgb PLC inst structure
16:46
text click here to see how we did it
16:49
click here to see the entire series on
16:51
the bricks do more PLC and simulator
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