PLC Information Note Issued by IMCA

Press Release
Monday, October 15, 2012

Programmable Logic Controllers (PLCs) are widely used in a variety of small and large pieces of equipment on marine construction vessels, for example, cranes, winches, handling systems, dive systems and power management systems.

 

The International Marine Contractors Association (IMCA) has issued a PLC information note to help ensure that operation and failure modes are understood, and highlighting the importance of carrying out an FMEA (failure modes and effects analysis) and testing the components and complete systems.


“When a PLC controlled piece of equipment is in use and a main power failure occurs, the equipment should revert to a fail-safe position, for example, brakes will be applied, valves may close or open and pressure may be ‘locked in’ or prevent movement.” Explains IMCA’s Technical Director, Jane Bugler. “The equipment should be in a safe state. The PLC Central Processing Unit (CPU) has a battery back-up power supply that should still allow the software program to run and detect that a main power failure has occurred and take the necessary action.


“However, given the same piece of equipment, what may happen if the PLC CPU is manually reset without main power failure during equipment operation? The control program may revert back to a start-up position which could, for example, release brakes and vent pressure. This may put personnel and equipment at serious risk of injury or damage.


“The behaviour of such PLC controlled equipment during restarting or software resetting of the PLC CPU unit should be fully understood. The consequences of restarting or manually resetting the software of such control systems during specific operations should be fully risk assessed. This should apply to any PLC controlled equipment where (high-) potential risk of injury or damage exists.”


The information note (IMCA M 15/12) highlights steps to be taken if PLC controlled equipment is new, or if an existing PLC is replaced with a new CPU, or the software programming of a PLC CPU has been modified or accessed in any way; and also provides useful references to PLC controlled equipment.


Further information on IMCA and its work with, and on behalf of, its members is available at www.imca-int.com and from IMCA, 52 Grosvenor Gardens, London SW1W 0AU, UK. Tel: +44 (0)20 7824 5520; Fax: +44 (0)20 7824 5521; and imca@imca-int.com

 

Maritime Reporter July 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Technology

TMT CEO Files $100m IP Suit Over Vessel Sale

Hsin-Chi Su, Chairman and CEO of Today Makes Tomorrow Group (TMT) launched a suit in Texas federal court on July 28, 2014, alleging that a planned bankruptcy sale of three company ships, including M.

MN 100: Dometic Marine

2000 N. Andrews Ave. Ext. Pompano Beach, Florida 33069 Tel: (954) 973-2477    Email: ned.trigg@dometic.com Website: www.dometic.com CEO: Roger Johansson President:

Harris Secures Certification for its Multi-channel Manpack Radio

Harris Corporation (NYSE:HRS) has received Type-1 National Security Agency (NSA) certification for its Falcon III® RF-340M multi-channel manpack radio. The certification

Offshore

CBP Aircraft Locates Vessel in Distress

U.S. Customs and Border Protection Office of Air and Marine agents assigned to the North Dakota Air Branch have located four people on Red Lake after a call

EMGS Reports 2Q and 1H 2014 Results

Electromagnetic Geoservices ASA's (EMGS) reported revenues of USD 42.5 million in the second quarter 2014, down from USD 61.3 million in the first quarter this year and from USD 44.

Transocean Fleet Update Summary

Transocean Ltd. today issued a monthly fleet update summary which includes new contracts, changes to existing contracts and changes in estimated planned out-of-service

Energy

EMGS Reports 2Q and 1H 2014 Results

Electromagnetic Geoservices ASA's (EMGS) reported revenues of USD 42.5 million in the second quarter 2014, down from USD 61.3 million in the first quarter this year and from USD 44.

Banking on US Shale Gas Boom, Asia Petrochemical Firms Switch to LPG

Asia petrochemicals firms are building tanks and retooling plants to store and process liquefied petroleum gas imported from the United States, counting on a flood

Danos Fabrication Facility Creates 150 Jobs

Danos, a family owned oil and gas service company, announced plans to expand its fabrication capabilities, by opening a 120,000 square-foot fabrication facility in Amelia, La.

Marine Equipment

USS Independence Successfully Completes Special Trials

USS Independence (LCS 2) successfully completed Special Trials (ST), a series of at-sea tests on Aug. 2, following the ship's participation in the multinational

Krill Supplies VFMMS to Island Tug and Barge

Krill Systems Inc., a producer of Vessel Fuel Measurement and Monitoring Systems (VFMMS), announced delivery, installation and successful sea trials of three more systems to Island Tug and Barge Ltd.

Danos Fabrication Facility Creates 150 Jobs

Danos, a family owned oil and gas service company, announced plans to expand its fabrication capabilities, by opening a 120,000 square-foot fabrication facility in Amelia, La.

Maritime Safety

Maersk Line Still the Leading Carrier on Reliability in Q2

During the second quarter, the overall industry reliability has improved. However, Maersk Line is pleased to have improved their performance so that they can

CBP Aircraft Locates Vessel in Distress

U.S. Customs and Border Protection Office of Air and Marine agents assigned to the North Dakota Air Branch have located four people on Red Lake after a call

IMB: Guard Against Threat of Cyber Attacks

The International Maritime Bureau (IMB) is calling for vigilance in the maritime sector as it emerges that shipping and the supply chain is the ‘next playground for hackers’.

Vessels

Maersk Line Still the Leading Carrier on Reliability in Q2

During the second quarter, the overall industry reliability has improved. However, Maersk Line is pleased to have improved their performance so that they can

Ecuador Coastguard Orders Damen Patrol Boats

Damen announced it has recently signed a contract with AstillerosNavalesEcuatorianos (Astinave) to construct two Damen Stan Patrols (Spa) 5009 for the Ecuadorian Coastguard.

TMT CEO Files $100m IP Suit Over Vessel Sale

Hsin-Chi Su, Chairman and CEO of Today Makes Tomorrow Group (TMT) launched a suit in Texas federal court on July 28, 2014, alleging that a planned bankruptcy sale of three company ships, including M.

Deck Machinery

Two MacGregor Subsea Cranes Ordered for Chinese PSVs

MacGregor, part of Cargotec, has secured a new contract from Chinese shipbuilder, Fujian Mawei Shipbuilding Ltd., for two 100-metric-ton active heave-compensated subsea MacGregor cranes.

Motion Compensation Aids Offshore Lifeboat Lift

In a refurbishment program to upgrade lifeboats on offshore platforms, Ampelmann completed a second successful reinstallation using its full motion compensation technology.

Markey Equips Research Vessel Sally Ride

Named for the first American woman launched into space aboard the Space Shuttle Challenger, the Research Vessel Sally Ride was commissioned August 9 at Dakota Creek Industries (Anacortes, Washington).

 
 
Maritime Security Maritime Standards Naval Architecture Pod Propulsion Port Authority Ship Repair Ship Simulators Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1463 sec (7 req/sec)