ME502 - Programmable Logic Controllers - Engineering Assignment Help

Assignment Task :

Question 1 (ME502)
a) Complete the empty spaces in the following table concerning the five IEC61131-3 standard languages.

b) Describe in your own words what a scan cycle is.

Question 2: 
a) Describe in your words how a current sourcing input module should be wired.
b) Describe in your own words what a wet relay output is.
c) Describe in your own words what happens in practice when the behavior of a PLC is termed to be realtime.
d) Prepare an LD code that uses two digital inputs A and B and calculate the NAND function thereof to an instantaneous output C.
e) Now add a second line of LD code that allocates the OR function of inputs A and B, to reset memory element D if the result is true.

Question 3: 
Two digital outputs (OUT1 and OUT2) are controlled by three internal relays (IR0, IR1, and IR2). The three internal relays are instantaneously calculated as follows:
i. IR0 is energized if either or both input IN0 and IN1 are energized.
ii. IR1 is energized only if both the inputs IN2 and IN3 are energized.
iii. IR2 is energized when either one, but not both, IN4 and IN5 are energized.

Question 4
a) Draw up a truth table containing IR0, IR1, and IR3 and show when OUT1 and OUT2 will be high or low.

b) Re-write the program in question 3 in Structure Text

Question 5
Write an LD program that can serve as an elementary fire alarm system.
Three (3) fire sensors with N.C. outputs, provide inputs to SET-RESET functionality.
The output is set and remains set when any one or more of the sensors are activated. The alarm is cleared by a Reset pushbutton, but the active sensor(s) take precedence over Reset.
a) Create a PLC Ladder Diagram to implement the fire alarm system. 
b) Simulate your solution in the Visual Simulation environment of Codesys and show that the results of your code, are correct.

Question 6:
Scenario
An LD program calculates the output Z, from two INT variables, x, and y. The calculation takes place in a function block that you must create yourself. The function block is programmed in ST and the formula is given below:

Question 7
a) What events transpire when input on a PLC is “forced” during debugging?
b) Why do many modern PLC’s have a coin battery?

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