Page 212 - Concise Encyclopedia of Robotics

Modular Construction
Data in
Data out
Amplifier
A/D Amplifier
D/A

Robot controller

Modem

MODULAR CONSTRUCTION
A few decades ago, electronic equipment was constructed in a much
different way than it is today. Components were mounted on tie strips,
and wiring was done in point-to-point fashion. This kind of wiring is still
used in some high-power radio transmitters, but in recent years, modular
construction has become the rule.
In the modular method of construction, individual circuit boards are
used, and each board (also called a card) has a specific function. Some-
times, several cards are combined into a module. The cards or modules
are entirely removable, usually with a simple tool resembling pliers. Edge
connectors facilitate easy replacement. The edge connectors are wired to-
gether for interconnection among cards and modules.
Modular construction has simplified the maintenance of complicated
apparatus. In-the-field repair consists of identification, removal, and
replacement of the faulty card or module. The defective unit is sent to a
central facility, where it is repaired using sophisticated equipment. Once
the card or module has been repaired, it can serve as a replacement unit
when the need arises.
See also INTEGRATED CIRCUIT.

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