Software Initialization And Test Functions; Working Program Functions - ConMed Sabre 2400 Operators & Service Manual

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However, since undetected failure of 27C256
could escalate a minor failure to a serious con-
sequence in the O.R. environment, the 27C256
program is equipped with many fail detection and
shutdown features. Further, an independent exter-
nal circuit (the Watchdog Timer) guards against a
malfunctioning 27C256 or CPU operation. This
safety system is discussed in the following over-
view of the 27C256 program.
3.1.4.1. Software Initialization and Test
Functions
The following list of software functions begins at
Power On Reset or by a manual reset performed
by an internal CAL switch. The following initial-
ization sequence must be successfully executed
before the main working program can be entered.
1. Initialize outputs to relays and indicators.
2. Initialize all data memory locations for the
working program.
3. Load the contents of the Non-volatile
EEPROM into working RAM space and verify
the validity of it's values.
4. Verify the microprocessor Watchdog Timer is
functioning correctly and that it can control RF
shutdown.
5. Display 8s on all numeric indicators, illumi-
nate all status indicators and sound four tones for
operator verification.
6. Verify that the RF circuitry is operating.
7. Verify that the Return Monitor circuits are
working.
8. Verify that the AC Line voltage is within oper-
ating limits.
9. Verify that no shorts exist in the hand/foot
controls.
10. Verify that internal data memories are func-
tioning properly and without crosstalk.
3-6
11. Verify that the contents of program memory
in all locations where the program resides is intact
using a 16-bit cyclic redundancy check.
12. Verify that the contents of the calibration data
is intact using a 16-bit cyclic redundancy check.
13. Verify that the contents of the preset data is
intact using a 16-bit cyclic redundancy check.
14. 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. An error tone is
sounded to alert the operator and the "HLP"
code is displayed on the Coag Power Level dis-
play. Refer to Table 4.7 for a list of HLP codes
and their possible causes.

3.1.4.2. Working Program Functions

The main program loop is executed continuously
by calling the working subroutines and refreshing
the CPU Watchdog Timer on each pass through
the loop.
Bipolar, 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 operator error
tone.
• More than one simultaneous activation request.
• Any activation request other than bipolar 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 stuck key press, or attempt-
ing to increase or decrease power levels beyond
the machine limits.