Ladder system programming using mobile app

Programming with Ladder System Using Mobile APP (Extra Material)
Industrial Automation Discipline for Electromechanical Technical Course
Professor MATHEUS Orlandini Domiciano
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The Ladder Programming System is a system that encompasses the basic knowledge of
binary logic systems, logic gates, electric motor controls and even more.
The system that we are using in our course is the one available for Clic-02 WEG, which is
a PLC model manufactured by WEG and that makes programming software available for
free.
Unfortunately, there is no compatible the mobile phone APP and the Clic-02 WEG.
However, to get around the situation because some students don’t have a computer to use
the software, I developed this small tutorial for an APP that has limited resources, but that
can help so much during the course.
Download the APP:
 PLC Ladder Logic Simulator
Desenvolvido por “raincontinues”
The first task to understand is the APP's premises. Let's see:
1. The APP works similarly to the Ladder of Clic02-WEG, however with several
limitations.
2. It works as a kind of spreadsheet, with rows, columns and cells, but the separations
between them are not visible.
3. The programming system has its linear logic horizontally, and it reads each line
sequentially, so it cannot be expected that it will execute line 5 before line 1.
4. The cells in the last column on the right are always intended for completion, either with
an output coil, a memory coil, a timer or a counter.
5. The coil is the last element of a programming line. There can be nothing after it.
Therefore, the logic of two coils in series in Ladder programming does not exist.
6. There should not be two coils with the same name, although this APP will accept this
directive, it should not be used, as the real programming Ladder system does not
understand that the coils have the same address.

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7. Basic graphic symbols of the programming system are the same:
8. When providing for a machine shutdown contact, care must be taken to place a NO on
the Ladder instead of an NC, as, by Standard, the physical external button will be an
NC, therefore, it must be understood that the input of the PLC will receive a continuous
“1” signal coming from the button.
9. The Outputs:
9.1. Coil: refers to a coil, as if it were a physical output from the PLC. Corresponds to
the “Q” type output on the ladder.
9.2. Memory: refers to a memory output to be used as an auxiliary resource.
9.3. Negative Coil: refers to a coil too, but in a state contrary to the previous item.
9.4. Latch: refers to a type of memory output, however with locking, once powered it
cannot be turned off, unless a Reset is activated. It is a good feature to use with
pushbutton.
9.5. Unlatch: performs the opposite function that the Latch memory would be
performing. Serves as Reset for the Latch function.
9.6. Timer ON: Timer function, referring to Ladder would be mode 1. The moment
this timer receives signal 1 from some input, this signal being continuous, it starts
counting the time until it reaches the established time value, and, upon reaching
this value, it sends signal 1 at the output. If the timer input signal stops, the timer
stops performing the task and resets.
9.7. Timer OFF: Timer function, referring to Ladder would be mode 3, however at the
beginning of the simulation, the function is activated (perhaps due to a failure in
the development of the APP), but works in the opposite way to Timer On.
9.8. When this timer receives a continuous signal 1 from some input, it activates signal
1 at the output. When he stops receiving signal 1 at the entrance, it will start

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counting the time and, when reaching the established time value, it will turn off
signal 1 of the output.
9.9. Counter UP: This counter counts up. Referring to Ladder would be mode 2.
9.10. Counter DOWN: This counter counts down. Referring to Ladder like mode 2.
9.11. Reset: Used only to reset the counters.
10. In this APP, the timers do not have a reset feature, because when they stop receiving
power (or “1” signal), they simply stop the time and reset.
11. To this software work, it’s necessary to number (or address) each function inserted by
clicking on Address with finger just above the function. If this is not done, the APP
will simply crash and close. It is important to do this with each insertion, because if
you leave it to the end the work will be much greater.
Let's go to the practical part:
After installing the APP on your android smartphone, open it:
Step 2:
Click on “Blank”
Step 1:
Click “+”

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12. Although you can name and prepare several projects, the APP does not generate any
files. The schedules will be saved within the APP but cannot be shared or sent to
anyone else.
Important information: after making the programming and to send it for correction, you
must take a Printscreen (as many as needed) from your smartphone, because the APP does
not generate files.
Exercises
Exercise 2 (reference to the original material):
Ladder programming for Lamps: L1 and L2.
Step 1: A push button S1 (pushbutton) should light the lamp L1, however it will remain
connected by a seal contact of L1.
Step 2: When a second push button S2 (pushbutton) lights the L2 lamp, the L1 lamp will
turn off. L2 must remain connected with L2 seal contact.
Step 3: A third push button S3 (pushbutton) will turn everything off at the same time.
Observing, in this case we will use an NC in the Ladder, but normally we use an NA.
Step 3:
Name the project
Step 4:
Window ready for
programming.

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Resolution in the APP
Step 1 (click with your finger):
In the red square.
Normal Open contact.
About the function you just
entered and then click
Address.
Result: Input function
inserted with address.
“Tell” the APP what the
type of entry is. In this
case, if you chose Output,
it would link any existing
output.
At the exit and select
“Coil”, which is like a
physical coil in the PLC.

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Thus, with this basic information it is already possible to do the exercise until the end and
then do the simulation.
Let's see:
About the function you just
entered and then click
Address.
Inform the APP if the
output is a coil or a
memory.
In this case it is a coil.
Then enter the exit number.

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Run the simulation:
Compare with the Resolution that was made on Ladder Clic-02:
Click on the play button
with your finger to start the
simulation.
Click on the “stop” button
with your finger to stop the
simulation.
Click on the "return" button
to edit again.
Final Observation: This smartphone-android APP was not developed by me, Professor Matheus. I just
prepared this material to help students of the technical course who do not have access to a computer,
realizing that this material is only for educational purposes, just as this APP seems to be.

Ladder system programming using mobile app

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