UL Student
Member
- Join Date
- Mar 2004
- Posts
- 4
Hey all, I'v got a few queries. hopefully they can be resolved. In our notes we are given a memory latch facility example as follows:
Q.1
What is confusing me is how can an input and an output have the same name? In the first line there are two. Also in the 3rd line there are two M500. How can M0 turn on M0 or is this just associated with a memory latch?
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Q.2: In our exam there is the possibility that we might be given a ladder diagram and solution but asked to phrase a question or make up an example where the problem might be used in industry.
When X0 is turned on M0 is SET to on. M0 then drives Timer T0. Once Timer T0 times out, Timer T1 is activated and output Y0 is turned on. Timer T1 times out allowing Timer T2 and output Y1 to be driven on. When Timer T2 has timed out, Timer T3 and output Y2 are activated and Timer T3 times out and resets M0. This resets all of the outputs and Timers, until Xo is remade.
So just a quick recap. What kind of question could be posed to come up with that answe. Its like working backwards but Im finding it difficult. Given an answer but have to make up a question.
Q.1
X1 M0
------| |--|-----( )-------
|
M0 |
------| |--|
M0 Y0
------| |--|-----( )-------
X0 M500
------| |--|-----( )-------
|
M500 |
------| |--|
M500 Y1
------| |--|-----( )-------
----------------------[END]--
What is confusing me is how can an input and an output have the same name? In the first line there are two. Also in the 3rd line there are two M500. How can M0 turn on M0 or is this just associated with a memory latch?
----------------------------------------------------------------------
Q.2: In our exam there is the possibility that we might be given a ladder diagram and solution but asked to phrase a question or make up an example where the problem might be used in industry.
X0
------| |------[SET][M0]------
M0 K5
------| |------(T0 )----------
T0 K5
------| |------(T1 )----------
|
| Y0
|____( )------------
T1 K5
------| |------(T2 )----------
|
| Y1
|____( )------------
T2 K5
------| |------(T3 )----------
|
| Y2
|____( )------------
T3
------| |------[RST][M0]------
---------------------[END]----
When X0 is turned on M0 is SET to on. M0 then drives Timer T0. Once Timer T0 times out, Timer T1 is activated and output Y0 is turned on. Timer T1 times out allowing Timer T2 and output Y1 to be driven on. When Timer T2 has timed out, Timer T3 and output Y2 are activated and Timer T3 times out and resets M0. This resets all of the outputs and Timers, until Xo is remade.
So just a quick recap. What kind of question could be posed to come up with that answe. Its like working backwards but Im finding it difficult. Given an answer but have to make up a question.