Cause : Fault in parameter memory (active in all operating states)

Software monitoring of correct functioning of the EEPROM module (non-volatile memory) on the A7009 board.

The EEPROM values contains all data which must be protected in the case of a power failure (i.e. parameter values and process data which must remain stored during power failures).

The following are monitored:

♦ Connection between the A7001 electronics board and the EEPROM on the A7009 backplane wiring assembly

♦ Whether the parameter values stored on the EEPROM are within the permissible value range

♦ Whether data are being correctly stored on the EEPROM. For this purpose, values are read and checked for correctness after they are transferred to the module

♦ Whether the checksum of the non-volatile process data in the EEPROM is correct

Possible causes for all fault types:

Excessive EMC-related interference is present (e.g. due to unprotected contactors, unscreened cables, loose shield connections)