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CiA 443

Subsea profile updated

CAN in Automation (CiA) has released the version 3.0.1 of the CANopen profile for SIIS level-2 devices, also known as subsea devices. The update contains mainly editorial improvements.

CANopen-connectable devices compliant to CiA 443 (SIIS level-2) are used in many subsea control systems (Photo: Siemens)

THE SIIS (SUBSEA INSTRUMENTATION INTERFACE STANDARDISATION) group comprises subsea control system suppliers. SIIS members develop interface specifications for 4 mA to 20 mA (level-1), CANopen (level-2), and Ethernet TCP/IP (level-3). The level-2 device profile has been jointly specified with the SIG (Special Interest Group) Subsea by CiA. The first version of the CiA 443 profile had been released in 2008.

Recently, the version 3.0.1 has been published. It is based on the improvements of the version 3.0.0, which specifies some parameters as mandatory in opposite to the predecessors. The last version introduces just a very few editorial improvements and clarifications. The specification is available for CiA and SIIS members only.

Many subsea control system suppliers have implemented the CiA 443 profile. Recently, Siemens and Statoil introduced a jointly developed subsea hydraulic power unit (SHPU), which provides optionally a SIIS level-2 (CANopen) interface. It can be used for offshore natural gas fields. The device supplies, low and high pressure control fluid to the subsea control modules. The subsea control module operates the hydraulic valves via CANopen. The hydraulic power unit can be used if the umbilical fails and also as an alternative to the hydraulic lines in the umbilical. The power unit has successfully completed the qualification process, in which it has passed function tests under hyperbaric pressure equal to a water depth of 500 m.

The SIIS group also organizes CiA 443 plug-fests in order to proof the interoperability of SIIS level-2 products. In addition, the SIIS group is specifying a CiA 443 conformance test plan.

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