DP Cabinet

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DP Cabinet
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DP Cabinet

• The DPC 21 (Dynamic Position Cabinet) comprises
  two identical computer, each with its I/O System.
• The cabinet comprises two areas
• Process cabinet
• Termination cabinet

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DPC Cabinet
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Process Cabinet

• Inside we will found the power supply, that
  provides a conversion from 220/230 Vac to 24 Vdc.
  This voltage will be distributed in the process
  cabinet.
• In the process cabinet each user is protected
  with a fuse.

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Process Cabinet

• A filtering system is installed before the AC/DC
  conversion to prevent current spikes and
  environmental disturbs.

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Process Cabinet
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Process Cabinet

• The Process cabinet comprises two card-rack,
  filled with the I/O interfaces.
• Each card-rack contains a BP-407S backplane which
  provides connectors for cards and cables.

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Process Cabinet

• The normal configuration for the card-rack
  comprises the following I/O cards.
• DI 400 (32 digital input channels)
• AI 400 (32 analogue input channels)
• AOV 406 (26 analogue input and 6 analogue output
  channels)

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Process Cabinet

• The serial line interface unit (TBSS) is used
  with up to two plug-in unit installed on it.
• Each unit can handle the RS-232, the RS-422 and
  the current loop protocol.

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Process Cabinet

• In a dual redundant system the thrusters are
  grouped into two independent groups.Each
  computer has two AOV-406, one for each group, in
  order to make the correct I/O signals.

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SBC 500

• The Single Board
• Computer 500 is a
• real time computer
• for control process
• purpose, based on
• the Motorola
• MPC755 RISC
• processor at 300
• MHz.

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SBC 500

• The SBC 500 perform the main task of DP system,
  included the Vessel Model. In the DP OS only the
  GUI is executed.

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SBC 500

• The SBC 500 main bus is the PBUS (Process BUS),
  also called PBUS2 on the new versions.
• Four alarm are provided
• Power under voltage
• Fan not running
• High Temperature
• WatchDog timeout

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SBC 500

• The front panel provides the following
  functions
• Reset
• NMI
• Mode
• RS-232 Console
• LED Indicators

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AI-400

• The AI-400 is an interface between the PBUS2 and
  32 analogue inputs.
• The input range is 10 Vdc
• Each input is provided by a low pass filter
• There are no configurable parts on the AI 400
  card.

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AI-400

• Can receive up to 32 voltage signals from the
  field. It low-pass filters the signals and then
  guides them one at the time through the Analogue
  Multiplexers for A/D conversion.
• When the SBC performs a read-channel-x
  instruction and the card address comparator in
  the PLD respond with match, the channel x value
  is multiplexed through the Analogue Multiplexers,
  A/D converted and enebled to the bus as a 16 bit
  word through the Output data buffer to the PBUS2.
• The SBC reads one value at the time from AI 400
  by addressing the card and one specific card
  device. The card device can either be one of the
  32 channels or one of several registers in the
  Register and Control Logic PLD.

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DI-400

• The DI-400 is an interface between the PBUS2 and
  32 digital inputs. It low-pass filters the
  signals and saves them in two 16 bit registers on
  the card.
• An optocoupler is included for each channel to
  isolate the field and the SBC side from each
  other.
• There are no configurable parts on the DI 400
  card.

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AOV-406

• The AOV 406 card is an interface between the
  Process Bus (PBUS2), and 26 single-ended analogue
  input and 6 single-ended analogue output
  channels.

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AOV-406 - Fail-safe outputs

• The fail-safe mechanism has two levels for this
  card. They
• are
• If contact with the SBC is lost, but the card
  itself
• functions OK, the PLD watch dog is triggered and
  forces
• the fail-safe values initially programmed to be
  set out by
• the micro-controller.
• The fail-safe values may be programmed for each
• channel and can be
• - the last received and accepted values from the
  SBC.
• - 0 Vdc.
• If the refresh mechanism on the card is defect,
  the refresh
• watch dog opens the analogue switches and set all
• outputs to 0 Vdc.

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AOV-406 Configuration

• The DIP-switch S1 bit 1, 2 and 3 are used to set
  the operational mode of the card. Bit 4 of the
  DIP-switch is not used.

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OK/error indication AI 400 DI 400 AOV 406

• A bi-colour (red/green) LED on the front of the
  card indicates the status of the card. A watch
  dog, controlled from the SBC, drives the LED.
• Green light indicates that the SBC sends
  module-alive messages to the card. This means
  that the SBC can see no error with this card. In
  a system with no errors all the I/O card LEDs
  light green.
• Red light indicates that the card is not running
  in the system. The reason for the red light can
  be
• the SBC has stopped.
• the watch dog on the card has timed out.
• the SBC has discovered a self diagnostics error
  on the I/O card and sends a module error messages
  to it that turns on the red LED.