Program Structure
The software is divided into three program elements (main control,
editor, and process).
The Main module accomplishes the following tasks:·
F
Digital I/O read and write.
F
Determine mode (edit or process).
F
Cassette management.
F
LCD display.
F
Chamber door control.
F
Temperature control
The Edit module controls the update of the system date and time as well
as the serial number, total machine cycles, and the preventative
maintenance screen. It uses parts of the main program (such as digital
I/O) to perform some of its tasks.
The Process module monitors the sterilization process as it occurs and
calls 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.
Input Data
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.
System Operation
Theory of Operation-Overview
2-14
STERRAD® 100 Sterilizer
ASP Service Guide rev. D
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