3-18
The following initialization sequence must be suc-
cessfully executed before the main working pro-
gram can be entered.
1. Initialize outputs to relays and indicators.
2. Initialize all data memory locations for the
working program.
3. Verify that the Watchdog Timer is functioning
correctly and that it can control RF shutdown.
4. Verify that the RF current circuitry is operat-
ing.
5. Verify that no shorts exist in the hand/foot
controls.
6. Verify that internal data memory input/output
lines function properly and without crosstalk
using a walking bit test.
7. Verify that the contents of program memory
in all locations where the program resides is intact
using a 16-bit cyclic redundancy check (CRC).
8. Verify that the contents of the calibration
memory (NOVRAM) in all locations where data
resides is intact using a 16-bit CRC.
9. Display 8s on all numeric LEDs and sound all
four tones for operator verification, and illumi-
nate all status indicators if all the previous tests
have passed.
10. Copy the last setting EEPROM to mode and
power registers if JMP1 is set to "last" and CRC is
OK. If the CRC test fails, factory defaults will be
loaded.
11. Enable RF output relays and pass control to
the working program.
Failure of any of the above self-tests will result in
the end of program executions, and a display of
"HLP" on the Cut display. A 1 KHz tone is
sounded to alert the operator and an error code is
displayed on the Coag Power Level LEDs to indi-
cate the Faults. See Appendix A.
The main program loop is executed continuously
by calling the working subroutines and refreshing
the Watchdog Timer circuit on each pass through
the loop.
Hand control, foot switch, and return electrode
inputs are monitored for changes. The validity of
the input conditions are checked. The following
conditions are considered illegal requests and
result in a pulsing 1710 Hz operator error tone.
•Simultaneous monopolar and bipolar requests.
•Simultaneous Coag and Cut requests.
•More than two simultaneous requests.
•Any request other than Bipolar Coag with the
Return Fault indicator ON.
In the case of an illegal hand/foot request, the last
valid request is the one honored. Other operator
actions that can result in a pulsing operator error
tone are multiple or continuous pushbutton oper-
ation.
The current condition of the hand/foot controls
and the keyboard are continuously monitored.
When a valid request to change mode or power
level is received, the displays are updated to reflect
the change. When a valid request for RF activity
is received, the following sequence is performed:
1. The appropriate RF indicator lamp and tone
are activated.
2. The requested accessory output relay is closed.
3. The current limit fail-safe is set.
4. The power setting is used to retrieve waveform
and amplitude parameters from the calibration
memory which are then sent to the RF drive
circuits.
5. RF output is enabled via /RFEN.
Self-tests are continuously performed during
operation to ensure the integrity and reasonable-
ness of hardware and software operation during
the working program execution. Failure of these
tests will result in a safe end-to-program execu-
tion (RF drive and all relays are disabled). A dis-
play of HLP on the Cut power levels LEDs and a
1 KHz tone alerts the operator to the condition.
The MACHINE FAULT indicator lamp is illumi-
nated, and the appropriate error code is displayed
Summary of Contents for sabre 180
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