MSA SUPREMA - Page 66

REV 0, June 2005Page 66
Operation Manual SUPREMA
4. Operation of the System
two items require access authorisation by entering a password or introducing a key into a
switch, if so equipped.
If the user wishes to press a restricted-access button and does not have authorisation, he must
enter the password or activate the key switch. Password authorisation remains in effect until
measurement mode is activated through operator input. Pressing the key switch will be requested
for each data input.
The system is delivered with the default password “AUER”.
All of the operator functions are available through both control units, the integral operation/
display unit and the PC, if connected. However, certain actions such as changing parameters
or calibration cannot be performed simultaneously through both control units. Therefore, to
perform an action of that type, modification authorisation will be required and verified. It will
remain exclusive for that control unit until measurement mode is activated either through operator
input or automatically due to inactivity, after which it will again be possible to switch between
the control units. If modification authorisation is at the PC and there has not been any
communication between the PC and SUPREMA system for more than 5 minutes, modification
authorisation will be released automatically.
In the “Measure” and “Diagnosis” submenus, data only is displayed, and so there is no access
control.
Measure
This window shows the measurement data for the inputs available in the system.
Three display types are available for selection:
• list
• bar
• led
The displayed measure values are updated at intervals. In order to have short update cycles by
a serial communication, the measurement data parameters displayed (tag, marking, unit, gas
type etc.) cannot be updated in cycles. Instead, when the PC operating program is started, all
of the sampling point parameters are transferred and stored in a buffer. The parameter settings
of a sampling point are only updated when being displayed or stored in the “setup” submenu of
the PC operating program. That means that, after the PC operating program has been started,
parameter changes carried out at the the integral operation/display unit are not automatically
displayed at the “measure” window of the PC operating program.
Measure mode
During normal operation the system is in measure mode, which displays all of the inputs available
in the system. Contrary to the common alarm LED at the MDO front panel, the display of
failures is not flashing. Measurement values that are over the full-scale range, or signal failures,
are latched. Measurement values below the measurement range behave as if they were non-
latching alarms.
Alarm mode
As soon as alarms are triggered, only the inputs in alarm status are displayed, arranged by
input number. Contrary to the alarm LEDs at the MDO front panel, the display of alarms is not
flashing.
Measurement values that are over the full-scale range are triggering up all alarms caused by
values exceeding the limits. Alarm types are latching or non-latching.