You should submit two separate ladder logic files for the lab, one for each part.

INSTRUCTIONS SUBMESSION

You should submit two separate ladder logic files for the lab, one for each part. The submitted file should be the Do-more Designer file with the “.dmd” file extension. There are multiple files saved along with it, but you only need to submit the DMD file. Files should be named with Lab, the part, and your name (for example Lab_Part1_Shan_John.dmd).NOTE: If you did not specifically save your file somewhere on your computer, the DMD file is probably in the default project folder, C:\Users\Public\Documents\Do-more\Designer2_9\Projects.Ladder Logic World – PLC Programming Tutorial:

Ladder Logic

Important: please use this link to download this software and install it in order to do the task:

https://we.tl/t-ilHcWfKefu

Lab – Programming a PLC
Purpose
Programmable Logic Controllers (PLCs) are at the heart of countless Industrial Control Systems (ICSs). This
lab is not intended to make you all outstanding PLC programmers. It is intended to expose you to PLC
programming to understand how ICSs are built and give you an idea of what they can do.
Part 1 – Create a Sawtooth Analog Output
Description
Create an analog output that goes between 4-20 units when an enabled bit is set.
Details
The following are the detailed specifications for the program:
•
•
•
•
There should be an enabled bit that turns the output signal on and off.
The output signal should always be in the range of 4-20 units.
The output signal should reset when the enabled bit gets turned off. This means that the output signal
should restart the sawtooth signal from 4 units and increase.
The rate of increase/decrease for the output signal should be 2 units per second.
Part 2 – Controlling the Level in a Water Tank
Description
Create a controller for the level in a water tower. The PLC should control the level in the tank such that it stays
within a certain range. The operator should receive an indication of the current tank level, and alarms and alerts
if the tank level goes above or below certain thresholds. The tank has an input pump and an output pump to
control the level of the tank. The control system also has a maintenance override that will allow the operator to
fill the tank if it is empty and drain the tank if they need to do maintenance.
Details
The following are the detailed specifications for the program:
•
•
•
•
•
•
The tank level goes from 0 to 100.
The lower and upper limits are 10 and 90 respectively.
o If the tank level falls below the lower limit, the output pump is turned off, and the input pump is
turned on.
o If the tank level rises above the upper limit, the input pump is turned off, and the output pump is
turned on.
The lower and upper alarms are 30 and 80 respectively.
o If the tank level falls below the lower alarm, an output light should turn on indicating the lower
limit.
o If the tank level rises above the upper alarm, an output light should turn on indicating the upper
limit.
The normal operating level for the tank is 70.
o The tank should fill to the normal operating level and then stay there during normal operations.
The input and output pumps should both be turned on.
If the tank is below the normal operating level, the Input Pump runs at 10 gallons/second. During normal
operations, the Input Pump matches the Output Pump rate.
A Maintenance Mode button needs to be implemented.
o This allows the tank to fill if it is empty (at the start and during maintenance).
o This also allows the tank to be emptied when preparing for maintenance.
•
•
•
•
o Maintenance mode functionality should give the operator the ability to turn on the pumps at their
maximum rates. During Maintenance Mode, the Upper Limit for the tank should never be
exceeded.
The Input and Output Pump Motors both have a time delay of 1 second.
o When the Input Pump Start button is pressed, the Input Pump light turns on immediately, and the
pump itself starts 1 second later.
o When the Input Pump Stop button is pressed, the Input Pump itself stops after 1 second, and the
Input Pump light turns off then as well.
o The same conditions exist for the Output Pump as well.
Necessary Buttons
o Input Pump Start
o Input Pump Stop
o Output Pump Start
o Output Pump Stop
o Maintenance Mode On/Off
Necessary Lights
o Input Pump On/Off
o Output Pump On/Off
o Maintenance Mode On/Off
o Lower Alarm
o Lower Limit
o Upper Alarm
o Upper Limit
Output Values
o Tank Level
o Input Pump Rate
o Output Pump Rate
Lab Submission
You should submit two separate ladder logic files for the lab, one for each part. The submitted file should be the
Do-more Designer file with the “.dmd” file extension. There are multiple files saved along with it, but you only
need to submit the DMD file. Files should be named with Lab 1, the part, and your name (for example
Lab1_Part1_Shan_John.dmd).
NOTE: If you did not specifically save your file somewhere on your computer, the DMD file is probably in the
default project folder, C:\Users\Public\Documents\Do-more\Designer2_9\Projects.