ABB AC 800F Mounting And Installation Instructions Manual page 184

5
EDC unit
Every 32-bit value in the main memory is provided
with a checksum to improve data integrity.
EPROM
Burst flash EPROM for rapid access. Programmable
while installed in the system, no need to replace
EPROM
EEPROM
Configuration data memory and diagnostic data
memory independent of battery buffering
Diagnostic interface
Serial diagnostic interface (see also Sections 4.1.5
and 5.4).
Temperature monitoring
Operation at temperatures outside the permissible
range reduces
temperature
overtemperature is signaled. Signaling is reset at
hysteresis temperature. Operating hours at normal
operating temperature and at excess temperature
are counted separately.
Connecting/disconnecting fieldbus modules
Modules in slots F1 ... F4 can be plugged in and
removed while the system is running (i.e. when live).
Follow the instructions given in Section 7.1.
Watchdog
The independent watchdog module will reset the
module if not triggered within a specified time. This
avoids "blocking" of the operating system.
Real-time clock
The time and date of the real-time clock must be set
when the AC 800F is used for the first time. When a
buffer battery is used, this setting will be maintained.
If the max. possible deviation should be too
important, it is recommended to use a radio clock.
5-16
the MTBF. Therefore,
is measured cyclically
AC 800F Functional Description
Correct 1-bit error
Signal 2-bit error.
4 MB, 32-bit words
Serial 16kbit EEPROM,
write cycles ≥ 10 7
data retention ≥ 10 years
RS232, 9600/19200 bauds.
Resolution:
the
Accuracy:
and
Overtemperature:
Hysteresis:
Plugging cycles ≤ 1000
Current per contact ≤ 1 A
Trigger time ≤ 1.6 s
Basic accuracy: ± 20ppm
Temperature influence:
-10/+120 ppm
± 5 ppm/a
Aging:
Max. deviation per year:
-1104 ... +4573 s/a
,
0.5 °C
± 2 °C
70 °C
65 °C