
The
Process
module monitors the sterilization process as it occurs and
call each of the stages in turn:
F
Vacuum
F
Injection
F
Diffusion
F
Plasma
F
Vent
F
Abort cycle
All of these modules, including the abort cycle, use parts of the main
program to perform their tasks.
Three types of input data are accepted by the software. Analog inputs
(temperature, pressure, and RF power) are converted to digital readings
and interpreted by the software. Operator inputs (inserting cassettes and
pressing pressure switches) are read as digital inputs. All other sensors
used as inputs to the system are digital.
Digital and analog inputs are used to monitor all phases of the process,
just as digital outputs control the process.
Output Data
Outputs to the operator include LCD messages, printed messages,
control panel lights, audible beeps, and the opened or closed door.
Digital outputs to the machine’s hardware components are used in every
stage of the sterilization process to perform tasks such as opening and
closing the throttle valve, controlling the RF power, and communicating
with the printer.
The software runs a 100 millisecond interrupt as its highest priority
interrupt. If the “heartbeat timer” interrupts any segment of the
software, other than the monitor state, the software goes to cancel/abort
processing and provides a controlled failure rather than system lockup.
In three cases 100 milliseconds is too long for the system to wait
between cycles. For these three areas the software uses a 10 millisecond
interrupt as an interrupt for faster processing:
F
the throttle valve controller
F
the bar code reading
F
cassette positioning mark detector
Theory of Operation
User Interface and Control Subsystems
ASP Service Guide rev D.
STERRAD® 100 Sterilizer
6-5
Содержание STERRAD 100
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