IMCA Advisory on Use of Equipment Controlled by PLC's

Monday, October 29, 2012

The International Marine Contractors Association (IMCA) advises on safe use of Programmable Logic Controllers (PLC's).

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 programme 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 programme 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 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

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

Technology

Globecomm to Provide VSAT for PBJV Barge

Purpose-built accommodation and pipe-lay barge on charter to Petronas equipped with VSAT and L-Band services. Globecomm Maritime has been awarded a contract

LiveCom Selects iDirect Evolution to Enable Global Expansion

iDirect Asia Pte Ltd today announced that LiveCom Limited (“LiveCom”), a Hong Kong based ISP, has selected Evolution as the platform to help enterprise and government

FLNG Prelude: A New Dawn in the Age of Maritime & Energy

Longer than four football fields, as big as six Nimitz-class aircraft carriers and almost as tall as the Taipei 101 skyscraper, Royal Dutch Shell PLC is hoping that its record-setting,

Maritime Safety

Bollinger Fourchon: 13 Years Without a Lost Time Accident

Bollinger Shipyards, Inc. announced that their Bollinger Fourchon, L.L.C. facility has worked 13 years without a lost time accident. Building on a philosophy that starts at the top,

Charter Boat Crew Rescued in Gulf of Mexico

U.S. Coast Guard search and rescue crews worked throughout the night to find a missing charter boat with four people aboard as far as 70 miles off Galveston. A

Regulations Threaten Superyacht Innovation

To increase innovation within the superyacht industry, designers need to work with flag states, classification societies and naval architects to ensure regulations are workable, as said by experts.

 
 
Maritime Careers / Shipboard Positions Offshore Oil Pipelines Pod Propulsion Port Authority Ship Electronics Ship Repair Ship Simulators Shipbuilding / Vessel Construction 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: 0.1309 sec (8 req/sec)