Teesside University PLC Programming Assignment Solution

This document presents a comprehensive solution to a Programmable Logic Controllers (PLC) assignment. It addresses various scenarios, including the operation of alarm systems, lamp tests, and parking space sensors. The assignment utilizes ladder diagrams to illustrate the logic and control sequences. Case studies are provided to analyze different situations, such as the response to an alarm condition and the behavior of a parking space monitoring system. The solution includes detailed explanations of the logic behind each scenario, incorporating the use of contactors, inputs, and outputs. The document also features a ladder diagram for a parking space sensor system, explaining how the AND gate and inverters are used to indicate the availability of parking spaces. The assignment is well-structured, providing a thorough understanding of PLC programming and its applications in industrial control systems.

Running head: PROGRAMMABLE LOGIC CONTROLLERS 0
Paper Title Capitalized and Centered
Name of Student
Institution Affiliation

PROGRAMMABLE LOGIC CONTROLLERS 2
Question one
Case 1
If the operator press the ACCEPT button when the plant is alarm the audible alarm stop and the
flashing Amber light changes to Permanently ON (Bolton, Programmable Logic Controllers,
2016).
Ladder Diagram
In this case we will have to use three contactors as outputs these are namely (Q 0, Q1 and Q2)
and three inputs that is ( I0, I1, and I2 ) (Clements, 2016).

PROGRAMMABLE LOGIC CONTROLLERS 3

PROGRAMMABLE LOGIC CONTROLLERS 4
Conclusion from above scenario
When the ACCEPT button (IP1) is pressed and when the plant is in alarm condition then the
(OP0) will glow and alarm stop therefore we have to connect the Normally closed contact for Q1
to the OP2
Case 2
If the plat drops out of the alarm condition before the ACCEPT button is pressed, the panel will
show a flashing green light (Committee, 2015). The audible alarm and the amber light will go
OFF
- If the plant drop out of the alarm system (Alarm off )
- Before the ACCEPT button ( accept off)
- Therefore the green light will indicate OFF and the OP0 and OP1 will be OFF.
Case 3
If the ACCEPT button was pressed when the plant is healthy as in 2 above the flashing green
light will go OFF. If the ACCEPT button is ON and the plant healthy (alarm off) then green light
OFF.
Case 4

PROGRAMMABLE LOGIC CONTROLLERS 5
There should be a lamp test (the button which when pressed will light all lamps and sound the
audible alarm).
Lamp test. The button ON then the OP0, OP1 and OPQ will also be ON.
We will have to note that, it is started by whatever we can through use of the three contactors as
in the problem.
Question two
The logic ladder diagram can be explained as below;
- The AND gate will gather all the input from 6 parking space sensors and then generates a
1 when completely filled if not it will gives a 0.
- Inverting the signal makes the green light to glow indicating available spaces and direct
interpretation glows red indicating no parking space available (Committee, 2015).
- OP 1 signal generated after ANDing the IP1 sensor signal and gives the output from a
very large AND gate.
- OP0 signal generated after ANDing the IP0 signal the output from large AND gate. The
ladder diagram is shown in the diagram below;

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The sensor installed in every car parking space those generates high output when occupied.

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