Interconnetion Diagrams

called an electromechanical drawing is used. These

electrical prints as they represent more complex

drawings are usually simplified both electrically and

circuitry and systems.

mechanically, and only those items essential to the

Shipboard electronic prints include isometric

operation are indicated on the drawing.

wiring diagrams that show the general location of

electronic units and the interconnecting cable runs, and

LOGIC DIAGRAMS

elementary wiring diagrams that show how each cable

is connected. Also included among the common types

Logic diagrams are used to show the operation of

of shipboard electronic prints are block diagrams,

logic circuits in some IC equipment. They are used in

schematic diagrams, interconnection diagrams,

the operation and maintenance of digital computers.

electromechanical drawings, and logic diagrams.

Graphic symbols from American Standard Y32.14 are

The following paragraphs will discuss only those

used.

diagrams that were not discussed when we covered

Basic logic diagrams are used to show the operation

electrical prints.

of a particular unit or component. Basic logic symbols

are shown in their proper relationship to show operation

INTERCONNECTION DIAGRAMS

only in the most simplified form possible.

Interconnection diagrams show the cabling between

Detailed logic diagrams show all logic functions of

electronic units and how the units are interconnected.

the equipment concerned. In addition, they also include

All terminal boards are assigned reference designations.

such information as socket locations, pin numbers, and

Individual terminals on the terminal boards are assigned

test points to facilitate troubleshooting. The detailed

letters or numbers or both.

logic diagram for a complete unit may consist of many

separate sheets.

ELECTROMECHANICAL DRAWINGS

All input lines shown on each sheet of detailed logic

Electromechanical devices, such as synchros,

diagrams are tagged to show the origin of the inputs.

gyros, accelerometers, and analog computing

Likewise, all output lines are tagged to show destination.

In addition, each logic function shown on the sheet is

elements, are commonly used in IC equipment. For a

tagged to identify the function hardware and to show

complete understanding of these units, neither an

function location both on the diagram and within the

electrical nor a mechanical drawing would be

sufficient. Therefore, a combination type of drawing

equipment.

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