![protel 99se gerber set absolute origin protel 99se gerber set absolute origin](https://pic2.zhimg.com/v2-01c9a9cfe66f70f34f6bb94254083611_b.jpg)
It also allows you to divide the internal power/ground plane into multiple sub-layers, ie each internal power/ground plane can have two or more power supplies such as +5 V and +15 V and so on. Each internal power/ground plane can be given an electrical network name, and the board editor automatically connects this level with other pads of the same network name (ie, electrical connections) in the form of pre-cords. The traces or other objects placed on these planes are copper-free, ie the working layers are negative * (negative). These working planes are dedicated to power lines and a ground lines.
![protel 99se gerber set absolute origin protel 99se gerber set absolute origin](https://i.ytimg.com/vi/L2Iq5-kxJFw/maxresdefault.jpg)
The Protel 99 SE supply 16 internal power / ground planes (referred to as the internal plane):. The signal layers are positive, ie the traces or other objects placed on these working planes are copper-clad areas.
![protel 99se gerber set absolute origin protel 99se gerber set absolute origin](https://image.slidesharecdn.com/protel99setraningmanualpcbdesign-120912101948-phpapp02/85/protel-99-setraningmanualpcbdesign-83-320.jpg)
The signal layer is mainly used to place the components (top and bottom) and traces. Protel 99 SE provide 32 signal layers including TopLayer, BottomLayer, MidLayer1, MidLayer2. The working layers provided by the Protel 99 SE can be broadly categorized into seven categories: Signal Layers, Internal Planes, Mechanical Layers, Masks, Silkscreen Layers), Others (Working Layers) and System (Working Layers), execute menu commands during PCB Design Design / Options to set the visibility of each working layer. Only after understanding the functions of these working layers can the printed circuit board design be accurate and reliable. Protel 99 SE offers several types of working layers. Before we proceed with the PCB design, the first step is to choose the right working layer.