.: SIIS - Subsea Instrumentation Interface Standardisation :.

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The concept of SIIS originated with BP and Shell in 2003. Following an initial meeting with other leading Oil-Field Operators (held in July 2003), and two subsequent meetings with the subsea controls industry, held in October 2004 and late January 2004, a Subsea Control System User Group was formed, involving the operators with representation from:-

BP
Shell
Total
ENI-AGIP
Norsk Hydro
Statoil
ChevronTexaco

and subsea control system vendors:-

ABB Offshore System Limited
Aker Kvaerner
Cameron
Dril-Quip
FMC/KOS

The Subsea Control Systems User Group identified a number of issues on which the operators may like to see progress in terms of standardisation of interfaces. This may facilitate greater reliability for subsea field developments and reduce risks to functionality and schedule.

The first topic discussed by the Subsea Control System User Group has been Subsea Instrumentation Interface Standardisation (SIIS).

The scope of the SIIS initiative is distinct from IWIS (standardisation for downhole instrumentation) and it is limited to subsea production system instruments interfacing directly to the Subsea Control Module.

The Group initially discussed a five-level classification system for control system-to-sensor interfaces. This was simplified to three levels in September 2007. The SIIS JIP meeting is focused around a number of member led technical working groups:-

Application Layer
Topology & Connector
Level 3
EMC

SIIS agreed on a suitable protocol to be taken forward as a basis for standardisation.

The CANOPEN interface type was selected as the SIIS protocol.