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 May 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Technology

BMT Isis to Support NATO Submarine Rescue System

BMT Isis (BMT), a subsidiary of BMT Group Ltd, has announced that it will provide safety and environmental support for JFD’s five-year contract with the UK Ministry

Sweden’s First AIS Aid to Navigation Deployed

True Heading, manufacturer of Automatic Identification System (AIS) solutions, GPS compasses and app navigation, has supplied an AIS Aid to Navigation (ATON) beacon to the Port of Stockholm, Sweden.

Robotics Ocean Monitoring Alliance Formed in Africa

Blue Ocean Monitoring enters into strategic alliance with Sea Technology Services   Blue Ocean Monitoring (BOM) announced that it has entered a strategic business

Energy

Hoegh LNG Bags FSRU Deal in Chile

Oslo-based Höegh LNG said it has signed an Floating Storage and Regasification Unit (FSRU)contract with Chilean Octopus LNG for the Penco-Lirquén LNG import terminal to be located in Concepción Bay,

CNPC Eyes Myanmar for LNG Terminal

China's biggest oil and gas company China National Petroleum Corp.(CNPC ) has expressed interested in  a terminal in Kyaukphyu in Myanmar  to receive imported Liquefied natural gas (LNG).

Former Petrobras Exec Sentenced to 5 Years Jail

A Brazilian judge sentenced a former international director at state-run oil firm Petroleo Brasileiro SA to five years in prison for money laundering on Tuesday,

Marine Equipment

Superyacht Marina Planned at San Juan, Puerto Rico

Puerto Rico Ports Authority issues RFP for Marina District. The project envisions a superyacht marina and dry dock maintenance, repair and overhaul facility

BMT Isis to Support NATO Submarine Rescue System

BMT Isis (BMT), a subsidiary of BMT Group Ltd, has announced that it will provide safety and environmental support for JFD’s five-year contract with the UK Ministry

Hapag-Lloyd to Enhance ADX to Bari, Italy

Effective June 27, 2015 Hapag-Lloyd will enhance its Adriatic Express Service (ADX) with a new call at Bari on the eastbound leg. Starting with the sailing of MV Warnow Beluga 147 EB,

Maritime Safety

Sea Shepherd Global Launches Operation Siracusa

Following on from the incredibly successful 2014 campaign, Sea Shepherd Global launches Operation Siracusa 2015. Led by Sea Shepherd Italia, the campaign aims

BMT Isis to Support NATO Submarine Rescue System

BMT Isis (BMT), a subsidiary of BMT Group Ltd, has announced that it will provide safety and environmental support for JFD’s five-year contract with the UK Ministry

Sweden’s First AIS Aid to Navigation Deployed

True Heading, manufacturer of Automatic Identification System (AIS) solutions, GPS compasses and app navigation, has supplied an AIS Aid to Navigation (ATON) beacon to the Port of Stockholm, Sweden.

Vessels

SITC Inks Deal with Qingdao Port

SITC International signed a strategic cooperation agreement with Qingdao Port International Co., Ltd. in Qingdao yesterday in order to further strengthen the strategic

Sea Shepherd Global Launches Operation Siracusa

Following on from the incredibly successful 2014 campaign, Sea Shepherd Global launches Operation Siracusa 2015. Led by Sea Shepherd Italia, the campaign aims

Superyacht Marina Planned at San Juan, Puerto Rico

Puerto Rico Ports Authority issues RFP for Marina District. The project envisions a superyacht marina and dry dock maintenance, repair and overhaul facility

Deck Machinery

Apply Now for the MN 100

The August 2015 edition of Marine News, the leading voice in the North American workboat market, will feature 100 leaders and innovators, including workboat owners and operators,

 
 
Maritime Careers / Shipboard Positions Maritime Security Maritime Standards Navigation Pod Propulsion Port Authority Salvage Ship Repair Ship Simulators Winch
rss | archive | history | articles | privacy | 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: 0.2025 sec (5 req/sec)