What is the method of manual wiring in PCB design in 22protel DXP_ Chengdu electromechanical Development Undertaking

SO SCM development guide 22

The road to the ends of the earth is long , One step at a time, one can expect . This article is introduced in Protel DXP in PCB The method of manual wiring in the drawing .

One 、 Drawing layers

Manual wiring needs to be done in the wiring layer , Generally, the wiring layer in the double-sided board is ：

->Top Layer（ Top layer wiring layer ）;

->Bottom Layer（ Bottom wiring layer ）;

Layer switching is carried out in the layer management bar at the bottom .

Two 、 Tools to be used for manual wiring

Generally, manual wiring requires two tools , You can find ：

-> Line drawing tools . In the wiring layer , Used to draw the wires on the circuit board .

-> Through hole tool . A via is a conductive hole , Used to connect wires in different wiring layers .

 

3、 ... and 、 Overview of manual cabling process

-> Set routing rules . For manual wiring , Line width does not need to be set , Because the line width is input by the operator .

The line spacing needs to be set , Although the line spacing is also drawn by the operator , But the line spacing rule is set , It is convenient to check , Because once the line spacing is smaller than the rule setting when drawing , The system will alarm , Mark the narrow lines with other colors .

The turning angle of the line needs to be set , Generally set as 45 degree , It is convenient to draw manually .

-> In the wiring layer , Use the line drawing tool to draw the lines that need to be connected .

-> When you need to connect across layers , Connect with a through-hole tool .

Four 、 Illustration of manual wiring

Then we will follow the previous simple example , Use a diagram to illustrate .

1. The original state before wiring

chart 2 It's original and has not been wired PCB chart , You can see , The pins to be connected are temporarily connected by flying wires , The goal of cabling is ： Formal and standardized wiring , Remove flying wire .

 

1. Set rules

As I said before , Wiring rules need to be set in the rules and Constraints Editor , Open at ：Design/rules,

Enter the rules and Constraints Editor , Manual wiring requires at least two rules ： Line spacing and corner ,

 

1. wiring

Wiring needs to be done in the wiring layer .

The wiring process is to click the line drawing tool in the toolbar above , Click the starting point of wiring （ Generally, it is pad ）, Start Wiring , Determine the direction and route , Click the end point （ Generally, it is also a pad ）.

Change the line width ： After starting wiring , Click on the Tab key , A dialog box for changing the line width pops up , You can set the line width here , Pictured 4.

4、 Place vias

Vias are generally used for cross layer wiring , Used to connect components between different wiring layers , Here are mainly pads .

Typical application scenarios ：

-> When conventional wiring is difficult , We need to use vias to relay ;

-> Used for bonding pad cross layer connection of surface mounted components, etc .

Key points of operation ：

There are no wires in all wiring layers 、 Place vias at the pad , Connect the via wire to the first pad 、 Connect through other holes , Then switch to another wiring layer , Then connect to other target pads or vias from this via .

 

5、 Remove flying wire

When all wiring is completed , You can remove the flying wire , It looks better like this . Of course, it seems that you can ignore it , Circuit board manufacturers can also process .

Method of removing flying wire ：

Double click the pad where the flying wire is to be removed , eject pad Dialog box , stay net The column is adjusted to no net, Set to no label , Naturally, the flying line is removed .

 

6、 complete

 

5、 ... and 、 Summary

Although manual wiring takes a little time , But the parameters and direction of the line can be determined according to the intention of the operator , It is very important in high-quality circuit board design .

At the end of this section , Wonderful to be continued . Provide single chip microcomputer 、PLC、 Circuit board 、 controller 、 Instruments and Apparatuses 、 Software 、APP、 Electromechanical equipment or system 、 Industrial control 、 Automatic control system 、 Control system development and design customization , Contact figure 6 website .