Prodigy I (System Numbers Df+11999 And Lower) Single Board; Controller; Sbc Functions; Sbc Reset - GE Medical Systems PRODIGY Service Manual

2.4 PRODIGY I (system numbers DF+11999 and
lower) Single Board Controller

2.4.1 SBC Functions

2.4.2 SBC Reset

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PRODIGY Service Manual (Rev C - 2000)
The microprocessor-based Single Board Controller (SBC) provides overall
operation and control of the scan table.
Control Functions
• Control of x-ray source power supplies, and shutter / collimator in a fail
safe manner.
• Provides control signals for two external stepper motor drives (Centent)
to scan patient in a fail safe manner and senses limit switch actuation at
the limits of travel (via FOINK see 2.11).
• Controls the detector array (communicates with the Detector Mother
Board, section 2.10.2).
• Responds to external scanner failure signals (interrupts generated by
SBC, FOINK see 2.11, and Detector Mother Board see 2.10).
Communication
• Communicates with PC host via an optically isolated RS-422 interface.
• Collects data from the detector array.
All SBC circuitry resets when the microprocessor resets. This is done during
power up, and can also be done over the communication port (via the host),
through connections to other circuit boards (especially the Detector Mother
Board, as a fail-safe shutdown), the by pressing the reset button on the SBC,
by pressing the Emergency Stop Button on the arm, or when a fault is
detected by the SBC or the FOINK (section 2.11.1).
Error Conditions Sensed by the SBC:
• Loss of Communications with the Detector Mother Board (DMB).
• Loss of Communications with the Host PC.
• Limit Switch tripped when shutter is open.
• Limit Switch depressed when commands are being sent.
• Failure in x-ray source kV programming
System Overview 2-43