KROHNE Summit 8800 Vol 1 - Manual (Page 20)

20 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol1 R02 en
SUMMIT 8800 DESCRIPTION 03
NOTE: These values (Max, Min, Hi and Lo) can be placed into a security display, where they can
be accessed by the “Edit” mode on the SUMMIT 8800.
Fault
Operational self-checking status .
In normal operation the self-checking routine, tests all memory components for data corrup-
tion. The watchdog circuit is also provided to detect a failure on the processor.
Faults will also be indicated for each board slot that contains a board that is either faulty, miss-
ing a critical board or the wrong type of board.
In case of a fault the LED will illuminate and all calculations will stop – an indication that a hard-
ware error has been detected, that has affected the operation of the flow computer.
Flow Limits
An alarm that indicates that the user-defined low and high flow limits have been reached. These
limits are expressed as a percentage of the maximum and minimum flow rate, and are typically
lower than the maximum and minimum values.
Flow alarm will come on when the uncorrected flow is above the HiQ value (% of the max flow
rate) or below LoQ (% of the maximum flow rate).
When an alarm occurs, the yellow LED will illuminate.
The HiQ is an accountable alarm and the LoQ is a non-accountable alarm.
Further details on how to set these parameters are explained in Volume 2.
3 .1 .6 Description of Hardware memory devices
The SUMMIT 8800 contains the following types of hardware memory storage devices which are
integrated on the board and cannot be removed from the unit.
Flash Memory
• Used to store the operating program (legally relevant software) of the device
• Non-volatile memory requires no power source to maintain integrity of data.
• Can only be externally accessed (Read or Write) when the unit is in the boot mode for pro-
gramming. This mode can only be accessed when a hardware switch seal is broken and
removed.
• Requires unique software tool to download and upload the program file via the USB port.
• Cannot be accessed using any common software tools.
• Integrity of program is maintained by the use of a CRC32 checksum.
Data Flash Memory (Configuration Data)
• Used to store all configuration and set-up parameters (legally relevant parameters).
• Non-volatile memory requires no power source to maintain integrity of data.
• Can only be externally written to when in open security mode. This mode can only be entered
when a hardware switch seal is broken and removed.
• Requires unique software tool to download and write the program file via the USB or ethernet
port
• Cannot be accessed using any common software tools.
• Integrity of data is maintained by the use of a CRC32 checksum.
Data Flash Memory (Recorded Data)
• Used to store all data log parameters
• Used to store all audit trail data and parameters