Control system for a subsea installation
The invention relates to a control system for a subsea installation based on CAN bus technology. A single cable forms a backbone for transmitting signals and/or power from a central control unit to a number of devices or sensors on the installation. Terminals are attached to the cable at intervals, allowing devices to be plugged in while the system is operable. A termination may also include repeaters or amplifiers for transmitting signals over longer distances.
1. A control system for a subsea installation which comprises:
a control module;
a common bus which is connected to the control module and which comprises at least one cable unit; and
a plurality of devices which are each removably connectable to the cable unit;
wherein each one of the devices comprises a bus controller having a unique address;
wherein the control module comprises means for communicating with each one of the devices over the common bus;
wherein said cable unit comprises a junction and a plurality of branch cables, each of the plurality of branch cables comprising a first end which is connected to the junction, a second end which is connected to a corresponding electrical connector that in turn is removably connectable to one of the devices, and at least two control signal supply cables which each extend between said first and second ends and are connected to said junction and said corresponding electrical connector; and
wherein said control signal supply cables are directly electrically connected to each other at said corresponding electrical connector.
2. A control system according to claim 1 , wherein each of said branch cables further comprises at least two control signal return cables which extend between said first and second ends and are connected to said junction and said corresponding electrical connector.