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

Technology

Eniram to Provide Boil-off Management for LNG Sector

Eniram Limited, the Finnish provider of energy management technology and data analytic services to the shipping industry, announced that it is releasing an onboard

Record Thames Ridership

A record 9.8 million passengers are using the River Thames‎, two years on from the launch of the Mayor's River Action Plan, it was announced today. The River Action Plan,

1st lifejacket for Working at heights

The first lifejacket custom-designed specifically for offshore personnel carrying out rope access or work at height has been developed by Survitec Group, the

Maritime Safety

Clyde Marine Training Reports Short Course Milestone

Clyde Marine Training informs it has reached a milestone this week, welcoming its 10,000th person to successfully complete one of its marine short courses. Christopher

Italy to Begin Naval Exercises off Libya

Italy will begin annual naval exercises this week near the coast of Libya, where a breakdown in order has allowed tens of thousands of migrants to try to reach

Hijacked Indonesian Vessel Found in Philippines

The hijacked Indonesian cargo ship Rehoboth has been found abandoned in waters off Mati town in Davao Oriental province off the southern Philippines coast, says the  the Philippine Coast Guard (PCG).

 
 
Maritime Contracts Naval Architecture Navigation Pod Propulsion Salvage Ship Electronics Ship Repair Ship Simulators 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: 0.1667 sec (6 req/sec)