32
Installation and Operation Manual
X-DPT-Profibus-DP-Interface-eng
PN 541-C-068-AAG
November, 2008
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Sensor zero EEPROM Database SRAM EPROM
Reserved error error error R/W error error
0 0 0 0=OK 0=OK 0=OK 0=OK 0=OK
1=Alarm 1=Alarm 1=Alarm 1=Alarm 1=Alarm
Diagnostics byte 1: Fatal system errors
Explanation of error bits:
1. Invalid EEPROM command: The code send to the slave device with
command byte 1 is invalid. i.e. the two least significant bits of the first
command byte have both been set to 1.
2. Invalid VOR command: The valve override command code send to the
slave device with command byte 2 is invalid. Either a number ranging from 6
to 15 has been set in the lower nibble, which is not allowed for a Smart
TMF controller model, or a non-zero number has been set and the ad-
dressed device is a Smart TMF meter model. The command has been
ignored.
3. Invalid totalizer command: The totalizer command code send to the
slave device with command byte 2 is invalid, i.e. a number ranging from 3 to
15 has been set in the higher nibble. The command has been ignored.
4. Device busy, command ignored: Either a zero command code or an
EEPROM command code has been send to the device, which is however
still processing the previous zero or EEPROM command. The command
has been ignored.
4.5.3 Fatal system errors
Table 5-3 below shows the bit-mapped alarm bits of the second extended
diagnostics byte, the fatal system errors. These error bits all indicate a fatal
system alarm, prevent the device from correct operation. The occurrence of one
of these fatal alarms will cause a system shutdown. Also in the diagnostics
message the static diagnostics bit will be set, i.e. the diagnostics message is
the only message to be send by the device. These alarm situations will not
disappear by them selves and immediate service is required.
Table 5-3: Diagnostics: Fatal system error bits
Explanation of error bits:
1. EPROM error: At start-up (after system reset or power up) the system
EPROM, containing the program is checked by determining the
checksum. If a checksum error has been detected, the system is shut
down. If communication is achieved, this bit will be set in the second
diagnostics byte. The error can not be masked.
2. SRAM R/W error: At start-up (after system reset or power up) the
performance of the system SRAM is checked by writing and reading
specific test patterns at all locations. If a faulty location has been found,
the system is shutdown. If communication is achieved, this bit will be set
in the second diagnostics byte. The error can not be masked.
3. Database error: At start-up (after system reset or power up) and
continuously during operation the parameter database is checked by
checking each parameter’s checksum. If a mismatch is found between the
calculated checksum and the stored checksum at a certain parameter
location, the database is considered to have become invalid. Bit 2 will be
set in the second diagnostics byte, and the system is shutdown. The error
can not be masked.
To Next Page
Loading...
