Logic diagrams! Watch

This discussion is closed.
Unregistered
Badges:
#1
Report 16 years ago
#1
Hi, I have my Systems & Control exam tomorrow and I really need some help. I need to know how to draw logic diagrams but I have no idea how to do this. For example, a question on a past paper says that a motor in a car won't start unless the seat belt is fastened, the door is closed and a secret security switch is pressed.
These are the logic states of the sensors:
Input A Seat belt fastened = Logic 1
Input B Door closed = Logic 0
Input C Secret switch pressed = Logic 1
Output Q Drives relay which allows the motor to start the engine when the ignition is turned.

There is then a diagram which looks a bit like this

A--

B--

C--

And you have to complete the diagram. Can anyone explain the whole logic thing or give me a link to somewhere as its really important. Thanks!
0
X
new posts

All the exam results help you need

1,880

people online now

225,530

students helped last year
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How are you feeling about GCSE Results Day?

Hopeful (214)
12.6%
Excited (156)
9.18%
Worried (305)
17.95%
Terrified (378)
22.25%
Meh (163)
9.59%
Confused (37)
2.18%
Putting on a brave face (233)
13.71%
Impatient (213)
12.54%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise