Automation for safety in shipping and offshore petroleum operations

Automation for safety in shipping and offshore petroleum operations

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The input relays are normally de-energized. However, in order to maintain the fail -safe concept to the PLC inputs, normally closed contacts from these de- energized relays keep the PLC input circuits on, in the non-alarm state. An inputanbsp;...


Title:Automation for safety in shipping and offshore petroleum operations
Author: Arthur B. Aune, J. Vlietstra, International Federation for Information Processing, International Federation of Automatic Control
Publisher:North-Holland - 1980
ISBN-13:

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