A little help?

[littlegreenman]

HELP!!!?

Im on an ONC engineering course and need help answering a question on an assignment...here goes

It asks me how are plcs programmed using EDDI and VIDIS, i do not actually know what these stand for and cannot find any information about them.

Also, what is an rs232 and rs485??

What is the best way to maintain a PLC in a industrial environment?

I would appreciate help of any kind!

littlegreenman:confused: banghead

[Steve Bailey]

Why is it that the British have such a knack for asking irrelevant questions on their standardized tests?

A quick check on Google shows me that EDDI is an editor, so an equally quick answer to your first question might be "not very often". I'll ask you a question. I found that answer in less than 30 seconds. Why couldn't you?

RS232 and RS485 are electrical standards for serial communication. Why is this something you need to know when dealing with PLCs?

A PLC is an electronic device. The industrial environment is typically dirty and has the potential for extreme temperature excursions, corrosive atmosphere, and many other insults. What factors do you think are important when trying to maintain electronic equipment in such an environment?

Are you taking this course to improve your chances for a bigger paycheck, or are you genuinely interested in learning about PLCs? I strongly suggest you read the 'New Here?' notice at the top of the page. Show evidence of a desire to learn, and people here will be willing to help you. Show evidence of seeking just enough information to pass the test so you can proudly show the certificate to your employer and demand a pay increase, and you'll encounter scorn and ridicule.

[littlegreenman]

Yes i do agree with you steve, the fact that these assignment ask irrelevant questions. yes i am trying to get these answers and i cant believe i did not find that after looking on the internet and several visits to the library. i have 5 assignments to do because of some inconveniences at my college and i have to hand them in soon. I do sincerely appreciate help and would like to thank you for replying. Electrical engineering is my field of work and my career and am continuing my education with the HNC and possibly an evening class to open up my understanding. At the moment im doin a NVQ course...maybe i took on abit too much, i was 19 this year an gettin stressed!

;)
the littlegreenman

[Tom Jenkins]

RS-232 is a serial communications standard using as a minimum transmit, receive, and signal ground wires. It detects bits by measuring the voltage difference between ground and the signal wires. It is often limited to 50 feet due to electrical noise interference, and is designed for one to one device communications.

RS-485 is also a serial communications standard. It uses two separate wires for transmit and receive, and measures the voltage difference between the two signal wires. Some RS-485 use separate pairs of wires for transmit and receive. RS-485 is more immune to electrical noise and can usually be used at distances of 4,000 feet or so.

[John Burr]

Steve.... I feel you have been rude in your reply to littlegreenman. Together with this you also have got your reply completely wrong with regards to EDDI and VIDAS. EDDI is the original FORD motor spec for plc diagnostics used at its plant in Dagenham England... not as you remark 'an editor'! VIDAS is similar to EDDI but modified slightly for General Motors and used widely at Vauxhauls England. Each motor manufacture has a slight variation on the theme regarding the sequence control and diagnostics when using PLC control. This is a brief overview here but felt strongly that to be rude and inaccurate when someone has simply asked for help is not acceptable!

[andybolton]

Electronic Diagnostic Display Indicator !!!

EDDI as used in ford plants from around 1979 onwards !!!
an array of lights that display the current fault on the plc system.


Andy

[HantekControls]

Not quite!

Error Diagnostics (with) Dynamic Indication

The lights, or other type of display shows the status of the machine which is being controlled by the PLC.

Jonathan

[OkiePC]

Why didn't they just call it Dynamic Indication of Error Diagnostics?

DIED for short...

Or just "annunciator panel" like everybody else!

Good Luck littlegreenman, and welcome to the forum.

[Mickey]

Why didn't they just call it Dynamic Indication of Error Diagnostics?

DIED for short...

Or just "annunciator panel" like everybody else!

Good Luck littlegreenman, and welcome to the forum.

Okie,did you notice the date of littlegreenman's post?
I guess its never to late to say "Welcome to the forum".

[OkiePC]

LOL, Mickey, no I didn't even look at those dates!

Okay, so HantekControls: Welcome to the forum, and warn us when you revive threads that have long since d.i.e.d.

:)

Paul

[porky]

Littlegreenman...
Your question ...no matter what anyone else thinks is still a valid question..... and remember ... when in doubt always ask..even if certain people mock you... always ask...its the best way of learning...

[rsdoran]

porky, did you read what was stated? This was posted in 2002, one of the reasons some answers were kind of rough is that back then this site was inundated with simple questions from students that did no research.