The power supply module is supplied with DC power from the topsides Electrical Power Unit (EPU) via the umbilical, low-voltage DC supplies for the input/output, communications and downhole gauge modules are generated internally.
Each Input/Output (I/O) modules incorporate 16 input and 16 output channels. Each input channel is configured for 4-20mA current loop detectors, providing 12 bit analogue to digital input conversion, line monitoring, configurable scan rates and individually configurable channels.
The module also includes 16 output channels for use with 24VDC loads. Each output channel is provided with 36-watt output drive capability, open and short circuit fault detection, driver fault detection, continuous circuit loop testing, software programmable testing and integral fly back suppression.
Housekeeping facilities are provided through the APB Module.
Flexible communications to third party equipment, such as DHPT sensors, is provided through a dedicated Communications Module.
Local processing capabilities which can be pre-programmed from the surface, which allows for simple, repetitive tasks (such as choke setting) to be managed subsea thus reducing umbilical comms traffic.
Vosper Thornycroft Controls, Inc., 14900 Woodham Drive, Suite 130A, Houston, TX 77073. Tel: 281-821-8448; Fax: 281-821-8442.