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Grace HMW7 1
Jessy Grace
ET372 HMW7
G00170423
Grantham University
09/28/2021
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Grace HMW7 2
Discrete-State Process Control
1. Produce a ladder diagram that will cause output Y to go HIGH when switch A and B are
closed OR when switch C is closed. (Hint: Start with the Boolean equation).
Y=AB+C
2. Design the ladder diagram for a new Ford truck door/safety belt system. When the truck
door is open and the seat belt is not clicked in, the truck will not start. If door is closed
and seat belt is clicked in, the key will start the ignition.
Truth Table
Key
Door
Belt
Start(output)
0
0
0
0
1
0
0
0
1
1
0
0
1
1
1
1
Key in, Door open, Seatbelt not clicked….no start
Key in, Door Closed, Seatbelt Clicked…start
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Grace HMW7 3
3. Create a ladder diagram to control a washing machine. This washing machine would
have a fill cycle to one level, a 10 second wash cycle, a 10 second rinse cycle and then
drain. Include a start button, low level switch, high level switch, an agitator motor, a fill
valve and a drain valve.
4. A control system is needed to control a small shopping center parking lot lighting system
and the exterior lighting for the building. The design specifications require that the
parking lot lighting and the exterior lighting turn on at dusk automatically. The parking lot
lighting should automatically turn off at midnight but the building exterior lighting should
remain on until dawn when it is turned off automatically. The system should repeat daily
and should not require adjustment for the change in the seasons. Locate and specify an
appropriate sensor if it is to operate at 120 vac as an input to a PLC. Create the ladder
diagram to accomplish the specified control. Paste the sensor specifications into your
document.
In this ladder diagram, a pushbutton is represented as a power or disconnect switch.
The Dusk-to-Dawn sensor after, provides the signal in order to change the state of
powering on the building lights. When the building lights turn on, the parking lot lights
turn on with it. The parking lot lights are set up on a timer switch so when the lights come
on, the timer begins. The timer or T4:1 is set to 21600 seconds for 6hrs. That means the
lights turn on roughly at 6:00 in the evening, parking lights switch off in 6hrs at midnight,
the building lights stay on, and the timer T4:2 is delays timer T4:1 for 18hrs until 6pm
again. The dusk-to dawn sensor should apply the needed signal to change the state to
turn off the building lights at dawn.
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Grace HMW7 4
The following is the specs for the sensor:
Manufacturer: Anxingo
Part Number: GEHS145
110 Volts (AC)
Shade Material: Dusk to Dawn
Wattage: 500 watts
*** NOTE: I have the LogixPro Software from a previous class that I used to build the
PLC programs.

Unformatted Attachment Preview

Grace HMW7 1 Jessy Grace ET372 HMW7 G00170423 Grantham University 09/28/2021 Grace HMW7 2 Discrete-State Process Control 1. Produce a ladder diagram that will cause output Y to go HIGH when switch A and B are closed OR when switch C is closed. (Hint: Start with the Boolean equation). Y=AB+C 2. Design the ladder diagram for a new Ford truck door/safety belt system. When the truck door is open and the seat belt is not clicked in, the truck will not start. If door is closed and seat belt is clicked in, the key will start the ignition. Truth Table Key 0 1 1 1 Door 0 0 1 1 Belt 0 0 0 1 Key in, Door open, Seatbelt not clicked….no start Key in, Door Closed, Seatbelt Clicked…start Start(output) 0 0 0 1 Grace HMW7 3 3. Create a ladder diagram to control a washing machine. This washing machine would have a fill cycle to one level, a 10 second wash cycle, a 10 second rinse cycle and then drain. Include a start button, low level switch, high level switch, an agitator motor, a fill valve and a drain valve. 4. A control system is needed to control a small shopping center parking lot lighting system and the exterior lighting for the building. The design specifications require that the parking lot lighting and the exterior lighting turn on at dusk automatically. The parking lot lighting should automatically turn off at midnight but the building exterior lighting should remain on until dawn when it is turned off automatically. The system should repeat daily and should not require adjustment for the change in the seasons. Locate and specify an appropriate sensor if it is to operate at 120 vac as an input to a PLC. Create the ladder diagram to accomplish the specified control. Paste the sensor specifications into your document. In this ladder diagram, a pushbutton is represented as a power or disconnect switch. The Dusk-to-Dawn sensor after, provides the signal in order to change the state of powering on the building lights. When the building lights turn on, the parking lot lights turn on with it. The parking lot lights are set up on a timer switch so when the lights come on, the timer begins. The timer or T4:1 is set to 21600 seconds for 6hrs. That means the lights turn on roughly at 6:00 in the evening, parking lights switch off in 6hrs at midnight, the building lights stay on, and the timer T4:2 is delays timer T4:1 for 18hrs until 6pm again. The dusk-to dawn sensor should apply the needed signal to change the state to turn off the building lights at dawn. Grace HMW7 4 The following is the specs for the sensor: Manufacturer: Anxingo Part Number: GEHS145 110 Volts (AC) Shade Material: Dusk to Dawn Wattage: 500 watts *** NOTE: I have the LogixPro Software from a previous class that I used to build the PLC programs. Name: Description: ...
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