Automation for safety in shipping and offshore petroleum operations
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 |
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