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CONTROL UNIT PACS 3000
The letters PACS stand for Programmable Autoclave Control System.
The purpose of the control system is to issue orders and send them to
the executive components of the unit so that a number of process steps
are performed in accordance with a predetermined template. The order
signals are worked out by the computer program of the control unit in
conjunction with measurements of actual parameter values for the
current program. These are usually times, temperatures and pressures.
Several different pieces of equipment can be connected to the control
unit for programming, monitoring and documenting the processes.
The operator communicates with the control unit via a control panel
or an ordinary PC. There are several versions of the operator-machine
interface, from the simplest, which consists of two pushbuttons and
eight LEDs to shows that certain statuses have been reached, to the most
advanced, which allow complete programming of the control system,
among other things.
All operator panels can be used to monitor the processes, since they
display all the set parameter values as well as actual values on request.
All relevant data associated with a given process, such as batch number,
operator number, date, etc., can be entered by the operator.
Programs, system definitions and process data can be documented by
connecting a printer to the unit. A host computer can also be connected
directly to the CPU of the control system.
If necessary, a measurement and monitoring system which is
completely independent of the control system, can be set up by
providing the equipment with a PACS SUPERVISOR. This contains a
separate CPU and its own measurement and control cards. The
SUPERVISOR performs its measurements by means of separate
temperature and pressure sensors alongside those of the control unit.
The system has links to the control unit CPU and can therefore use the
shared operator panel, as well as adding the control unit readings to the
process documentation. The SUPERVISOR can also be involved in
independent interlocking of door opening, for example.
The computer contains programs for automatic calibration of the
temperature and pressure sensors. Where alternative correction
constants are known, they can be entered manually. The testing
functions include means of activating analog and digital outputs and for
monitoring analog and digital inputs.
The control unit hardware is divided, so that the operator panels can
form small separate units that are easy to position at the most suitable
location. CPU, measurement and control boards and the power supply
are installed in separate electrical enclosures which are connected to the
operator panels by shielded cables.
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