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

Technology

U.S. Senators Urge Obama to Block Arctic Oil Drilling

A group of 18 mostly Democratic U.S. senators on Friday urged the Obama administration to stop Royal Dutch Shell's preparations for oil exploration in the Arctic,

Seaway to Receive Prestigious OECD Award

The St. Lawrence Seaway Management Corporation (SLSMC) announced today that it will receive a prestigious award from the Organization for Economic Cooperation

Torqeedo Introduces New Deep Blue Inboard

Torqeedo now offers a shaft drive version of its 40 and 80 horsepower Deep Blue motor. An electric drive designed for marine use from the ground up, the Deep Blue inboard shares the safety,

Maritime Safety

2 Americans Rescued North of Cuba

A Coast Guard MH-60 helicopter crew rescued two American sailors whose vessel ran aground approximately 25 miles north of Gibara, Cuba, Friday. Watchstanders

Seaway to Receive Prestigious OECD Award

The St. Lawrence Seaway Management Corporation (SLSMC) announced today that it will receive a prestigious award from the Organization for Economic Cooperation

Russian, Azerbaijani Navy to Hold First Ever Joint Drills in Caspian Sea

About 10 Russian and Azerbaijani ships will take part in a joint naval exercise in the Caspian Sea for the first time; RIA Novosti cited the statement of Russia’s Southern Military District.

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Navigation Pipelines Salvage Ship Electronics Ship Repair Ship Simulators Sonar 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: 0.1136 sec (9 req/sec)