CiA® 443: CANopen profile for SIIS level-2 devices

The CiA 443 CANopen profile for Subsea Instrumentation Interface Standardization (SIIS) level-2 devices provides communication interface specifications for simple sensors, multi-functional meters, and valves. Since the version 4.0, the document considers also battery cell assemblies, voltage converters, as well as the required unit for battery management. The default physical layer is ISO 11898-3 compatible. The default bit-rate is 50 kbit/s. Optionally, the classical CAN physical layer can be used, according to ISO 11989. The CANopen node-ID is assigned by Layer Setting Services (LSS). The profile specifies a bootloader mode, and the starting and stopping of application programs. Simple sensors include pressure, temperature, and position sensors as well as inclinometers. The profile also supports multi-phase flow, wet-gas, oil-in-water, and some other complex meters as well as dedicated detectors (e.g. PIG). There is no mapping defined for the four default TPDOs and RPDOs. The PDO communication parameters are pre-defined.

Offshore oil rigs require communication networks for being well informed at any time, e.g. about the conditions around the drilling whole. The Subsea Instrumentation Interface Standardization group (SIIS group) has introduced three levels of communication networks. SIIS level 3 networks cover the Ethernet-based communication between the oil rig and the CANopen-based SIIS level-2 networks, installed on the Ocean ground. On the deeply embedded level, the SIIS level-1, there are discrete analog interfaces. SIIS-level 2 networks, which are in the focus of CiA 443, comprise redundant controllers, different sensors, valves, and other equipment. CiA 443 has been developed and maintained in cooperation with this SIIS (Subsea Instrumentation Interface Standardization) group.

The CiA 443 profile comprises interface specifications for simple pressure and temperature sensors as well as complex multi-purpose instruments such as multiphase flow meters. Subsea actuators defined in CiA 443 include simple valves and valve controller units. Support for Layer Setting Services as defined in CiA 305 is mandatory. It is recommended to support the optional LSS identify service.

After power-on, SIIS level-2 devices enter the bootloader mode; application programs are not started automatically. In this mode, Heartbeat functionality is not disabled. The device waits for the start command given by the application manager. When an application program is started, the device first performs a local NMT reset node service. In this operation mode, Heartbeat functionality is mandatory. If all application programs are stopped, the device performs a local NMT reset node service and it falls back into bootloader mode.

The specification of the SIIS level-2 application manager is not covered by this device profile. It could happen that several manager-capable devices are integrated into the network. For this reasons the NMT “flying” manager functionality, as specified in CiA 302-2, is considered by these devices.

CANopen network linking several SIIS level-2 devices to the subsea control system, which communicates via CiA 309 with the off-shore platform control system

The CiA 443 profile includes several virtual devices. SIIS level-2 devices may provide a sub-layered network or serial links. In these cases, it serves as a gateway and provides proxies for the connected functions (e.g. different sensors). By this way, SIIS level-1 devices can be easily integrated into SIIS level-2 networks.

CANopen network linking several SIIS level-2 devices to the subsea control system, which communicates via CiA 309 with the off-shore platform control system

In CiA 443, the are following virtual devices specified:

  • Pressure sensors
  • Temperature sensors
  • Linear position sensors
  • Inclinometers
  • Multi-phase flow-meters
  • Wet-gas meters
  • Sand meters
  • Oil/gas meters
  • Single-phase meters
  • Water-cut meters
  • PIG detectors
  • Vibration monitors
  • Leakage detectors
  • Valve units
  • General analog inputs
  • Rotational position sensors
  • General digital inputs
  • General digital outputs
  • Corrosion/erosion sensors
  • Passive acoustic sensors
  • Chemical injection valve units
  • Battery management unit
  • Battery management assembly
  • Voltage converter unit
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CiA 443 version 4.0.0CANopen profile for SIIS level-2 devices
DescriptionThis document specifies the CANopen interface for SIIS level-2 devices. This includes instruments and actuators for subsea measurement systems. The specification of the SIIS level-2 application manager is not in the scope of this document.
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DSP2.5 MiB2022-11-18Login
CiA 443 version 4.0.1CANopen profile for SIIS level-2 devices
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WD2.5 MiB2024-01-18Login