ABB 615 Series ANSI Manual page 39

1MAC052634-MB D
615/620 series ANSI
Communication Protocol Manual
Clock not synchronized bit 13
The quality information bit is set in the IED's real-time clock if the IED has not been
synchronized.
Clock failure bit 12
The quality information bit is set in the IED's real-time clock if the clock has a severe
failure. Do not rely on this time stamp.
Data object ID bit 8
The coding alternatives of the data object ID registers 1 and 2 are the Modbus address or
UID. The coding alternatives cannot occur simultaneously in the IED but are selected and
configured at the system setup phase. The default setting is "Modbus address".
The UID code is 32 bits wide and occupies both registers. The word order is high/low. The
UID code refers to the functional design of the IED platform in which the object resides.
Shortly, it means that the UID code is equal in all the platform IEDs in which the same
functional design and the same Modbus object is used.
Data value identification bits 5..0
Coding of the event data value is one bit, two bits or 32 bits. The coding depends on the
IEC 61850 common data class, which is the origin of the Modbus data in question.
Vendor-specific implementation
Section 3
33