CAD Control diagrams

In some worlds, jumpers are shown as zero-ohm resistors so there is a "component" separating the "wires" you are talking about. This is done particularly when you might have "DNI" attached to the resistor (jumper) i.e. Do Not Install - common in printed circuit board assembly.

Fred

"davidd31415" wrote in news: snipped-for-privacy@f14g2000cwb.googlegroups.com:

If you are doing it in that manner, the wire number should change to reflect the number at last connection. Look at it this way.. Say you are the guy 3 years down the road trying to troubleshoot that wire. In the cabinet, field, etc, the wire will be labeled the same as your print. So the guy/gal reading your print, should be able to see at the component end, a wire number. Following that, it goes to some junction box with a terminal strip with 100 wires on each side. When he gets to the the terminal strip, he knows that wire 4050 is coming FROM his component, and 2120 is going backward TOWARD the control (origination point). If you do not change the wire number, some tech many not even notice that the terminal strip is there, since the wire is numbered 2120 at the device, and he/she has a 2120 at, say the PLC. May look fine at the PLC, but the problem may lie at the junction box. (Just an example.)

You don't have to use a new name, you can use ONE of the names of the two wires. In effect, if you have wire 1112 and 1113 jumpered together, then on the origination sheet, you would show the connection of the two. One of the two continues on to whereever sort of like below.

(Just my opinion..and from experience)

I understand what you are saying regarding future confusion if wire numbers are not changed and junction boxes are omitted. I was recently working on a system that had a print written exactly that way...

So it would be acceptable to have a wire coming up to a terminal strip with one number and have the wire connected to the other side of the terminal strip take on a new number (the same number that is written on the label for the terminal strip) ?

I guess I've just seen the same two numbers connected together on terminal strips so many times that the idea seems a bit awkward at first.

Thanks Anthony,

David

"davidd31415" wrote in news: snipped-for-privacy@g43g2000cwa.googlegroups.com:

Zackly....

I feel this produces much less confusion when troubleshooting. A terminal strip is just that...a wire terminal, a place where a wire ends, hence the number should end there also, IMHO. As long as the terminal strip is labled, and the wires labeled, some technician will thank you in the future.

How about representing RS232c connectors on diagrams such as these? Since there are two rows of pins should I just use a square going doen the columns and show each pin on a separate line? If anyone could point me to examples (any format) I'd appreciate it.

Thanks,

David.

Anth> "davidd31415" wrote in

I see a lot of different styles used in electrical prints, but there must be some educational material out there somewhere? I haven't had much luck with websites but how about books? Are there any books that cover these types of prints? Maybe I just don't have the right keyword to use to search with... Ladder-logic, control, electrical prints,...

davidd31415 wrote: