User Guide

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FAULT CONDITIONS
The below fault conditions may be detected by the software:
• EEPROM data error
• serial communication internal bus failure
• software dead loop.
EEPROM data error can be detected through EEPROM test
procedure at start-up or when explicitly requested using setup
menu, or during normal operational mode if a checksum
control fails.
When an EEPROM error is detected during normal mode, a
fault alarm is generated according to the user configuration
for the EEPROM corruption error (see “Alarm” section).
To close an error an EEPROM test (see “Selftest procedures”
section) or reset is required.
As soon as an EEPROM error is detected, the scrolling mes-
sage “EEPROM reset needed - Press up button to reset stored
data or right button to ignore” will appear on the primary
LCD.
If the  key is pressed, the process controller restarts opera-
tion, but alarm actions are performed as configured by the
user (see “Alarm - Error configuration” section). Note that
the device will be in Hold mode in any case.
If the  key is pressed, all the data stored in the EEPROM are
erased and the default values loaded. After that, the device
must be completely recalibrated.
An internal bus error is detected when internal transmission
is not acknowledged or a bus fault occurs for more than a
certain number of unsuccessful transmission attempts (due
for example to a damage occurred to one of the ICs con-
nected to the internal bus). After that the controller displays a
sliding message “Serial bus error”.