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System diagram

The Simrad TU40 system comprises a computer with display and the Trigger Unit.


(A) Display
(B) Computer
(C) Trigger Unit
(D) Maximum 12 hydroacoustic systems (sonars, echo sounders etc) 


A display is a required part of the TU40 Trigger System. For best readability, the display must be protected from glare and have the correct height and angle. The display is not a standard part of the TU40 delivery. This is a commercial item that can be purchased locally.

Processor Unit

The Processor Unit is the computer that controls the TU40 system. It is a vital part of the TU40 Trigger System. The Processor Unit is not a standard part of the TU40 delivery. A suitable computer may be provided with the TU40. 

The Trigger Unit runs autonomously. Once setup is completed, the TU40 program can be closed, and the Processor Unit can be disconnected from the Trigger Unit.

Trigger Unit

The Trigger Unit consists of a programmable logic controller (PLC) and other electronic circuitry that provide the synchronized trigger signals. The standard Trigger Unit can control up to 12 hydroacoustic systems.

Once et up, the Trigger Unit runs autonomously without the need of a computer or a software.