Programmable Logical ? what is it ?
orangutan
which we can programme ??
i saw some advertisment about programable logical course, but don't know
what is it.
thanks
Danforth
advertisement, then this is what it means, to engineering people. It's used
primarilly to control machinery in a step ladder format. If you are
thinking of signing up for the course, make an enquiry to find out which
brand of PLC they are using. Different brands do have some specific
programming differences with other brands. I would think that Omrons and of
late, Siemens, are quite popular in Malaysian industry, so you could be
quite industry ready if you completed the course properly.
But a word of extra info for you. PLC, is slowly getting phased out,
due to higher costs, and also larger size of the package. This is
especially true for Special Purpose Machines ( SPM ), but PLCs will probably
remain a preferred interface for spindles in cnc milling and cnc turning
machines, due to the fact that costs for these machines do not need to be
brought down that much to be competitive. The replacement that is coming in
strong, are chip driven gizmos, that I can't remember what they are called,
but they are on the new machines we just bought, and they are supposed to be
faster, cheaper, and can hold more data and programming variations.
orangutan wrote in message <36adb...@news2.tm.net.my>...
Silent Hunter
s...@tm.net.my
Danforth wrote in message <36adc...@news.tm.net.my>...
Bali-Peng
so get a DSP (Digital Signal Processor) which i'm working my project on. it
is virtually a circuit with built-in AD/DA converted with fast processing
capabilities that could outturn our Pentium & Pentium II. Currently, 3DFX,
handphones, satellites & various other micro controller are using this
technology.
Silent Hunter <s...@tm.net.my> wrote in message
news:36add...@news2.tm.net.my...
Danforth
Silent Hunter wrote in message <36add...@news2.tm.net.my>...
No, I mean, MCU is different from PLC. But yes, both devices can be used to
serve the same purpose, that I gave as an example earlier, ie, to control
specific motions of a machine, such as spindle functions, or linear motion.
Zamani
Silent Hunter wrote:
>
> MCU ( Micro-controller Unit etc. 8031/8051 can treat as PLC or not?)
Well. It's an 8 bit Intel microprocessor. But I'm not sure whether it
can be categorized as a PLC. I used it in a couple of applications
(traffic light controller, voltmeter etc). You have to program it using
assembly. Has ROM, RAM (128K), serial/parallel ports, timers etc. It's
still being used for certain applications. WHen you mention of PLC, I
kinda wanna think it's like a PLD. One where you put your logic circuit
implementation on.
Zamani
PeaceLoveJoy
wrote:
>MCU ( Micro-controller Unit etc. 8031/8051 can treat as PLC or not?)
The heart of any PLC is the microprocessor/microcontroller. The
ladder diagramming if it is done online would suggest a ladder diagram
interpreter. Most of the ladder diagramming are done off-line(from the
PLC) and done on a PC.
The ease of use of ladder diagramming has made it very popular
but it came with a price ; the lost of flexibility. If you use
assembly language for your programming you gain both speed and
flexibility but the learning curve is a bit steeper.
One other thing that most new comer to PLCs miss is the fact
that PLCs are ruggedised and isolated for industrial use. This partly
explains the higher cost.
>> But a word of extra info for you. PLC, is slowly getting phased out,
>>due to higher costs, and also larger size of the package. This is
>>especially true for Special Purpose Machines ( SPM ), but PLCs will
>probably
A study done by GM of the US found that embedded PCs will
become the choice of controller by the year 2000. By then 1/2 the
automation market will be expected to use embedded PC. These PCs after
ruggedisation is a fraction of the PLCs. Development tools and freely
available libraries are everywhere. These are the driving forces for
the use of embedded PCs. Computer Journal has a dedicated section on
this. Those interested can look up the said journal.
Oooo Peace & Joy ........