Good morning friends,

I wish you a nice weekend. Can anyone please explain to me what the Letters in the attached photo mean?

thanks in advanced.

kind regards to all of you.

 

It might be labels for additional connections to other circuits of the device.
Is this the full schematic?

 

Do you mean the letters along the bottom?

They just establish a grid along with the numbers in the side. So you can say: look at chip at G1 in the schematic.”

This was often used in paper maps so you could find a street by its grid location, back when people read maps because there was no GPS.

 

Do you mean the letters along the bottom?

They just establish a grid along with the numbers in the side. So you can say: look at chip at G1 in the schematic.”

This was often used in paper maps so you could find a street by its grid location, back when people read maps because there was no GPS.

sir,
so kindly as an example ( 5 v
I'm speaking about the three groups in red, which I drow it, how to read under +5v 3B6 or the GND 4U6)

 

There are 7 sheets of schematics drawings. The first number is the sheet number. The letter and number pair is the grid location on that sheet.

For example, 4U6 refers to GND on sheet 4 at grid U6.

 

So I was right after all.

 

There are 7 sheets of schematics drawings. The first number is the sheet number. The letter and number pair is the grid location on that sheet.

For example, 4U6 refers to GND on sheet 4 at grid U6.

thank you so much for your explanation

 

So I was right after all.

Yes sir, you were right, I appreciate you help

 

OK, those numbers are, as stated, sheet and grid references.
There is also a different scheme where numbers reference a wire number, and a still different scheme with numbers simply referencing another point of the same conductor located someplace else. Hence my confusion for a few minutes.

 

yes, there are different standards... one is numbering individual wires (two wires will have unique number even if connected together), another is where numbering is applied to equipotential planes(two wires will have same number if connected together).

as others have already stated, list of numbers TS is asking about is a cross reference. it tells where the mentioned signals is used elsewhere in the drawing set. the referencing method using grid location based on letters and numbers is quite common but not the only one. in North America it is common to use only numbers ... line numbers. this style uses numbers along left edge of the area - usually just one or two columns. say page has two columns of 30 rows, that splits page into two areas. left pane would have line numbers 00-29 (or 1-30) and right pane would have 30-59 (or 31-60).
then reference 11724 would mean that signal or component are located on page 117, line 24.

 

another scheme assigns wire numbers based on the first instance of that conductor line in the drawing. But it does not work well for actual hard-logic with relays and switches.
One organization does not assign wire numbers, so each wire end is tagged with the number of the terminal it connects to. Their equipment is miserable to repair or upgrade.

 

another scheme assigns wire numbers based on the first instance of that conductor line in the drawing. But it does not work well for actual hard-logic with relays and switches.
One organization does not assign wire numbers, so each wire end is tagged with the number of the terminal it connects to. Their equipment is miserable to repair or upgrade.

thank you

 

I refrained from naming that organization because they do make good industrial robots, and it the only integration required is to give the robot a "go" command, that is fairly simple to integrate.
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