Diagnostics; Fault Handling Function Block; Fault And Alarm Signals; Fault Word Bits - ABB DCS 500B Description

Functional Software description

• Diagnostics

FAULT HANDLING
function block
Fault and Alarm
signals

Fault Word bits

Alarm Word bits

Fault Logger

92
If a fault or an alarm has occurred, an error code is generated.
These codes are transferred to the fault logger (maximum 100 error
codes with occurrence time). This fault logger can be examined for
previous fault and alarm codes by means of the control panel or
CMT/DCS500 Tool.
In the event of a supply voltage failure, the program stores the data
of the fault buffers and data loggers to a protected memory on the
Control card SDCS-CON-2.
Control card SDCS-CON-2 has a self-diagnostic program. The pro-
gram indicates the current state of the drive on a seven- segment
display. These codes are given in the manual "OPERATING
INSTRUCTION".
Each fault and alarm/status is coded as an individual error code to
the LATEST FAULT (11106) and LATEST ALARM (11107).
Fault words FAULT WORD1 (11101), FAULT WORD2 (11102),
FAULT WORD3 (11103) and alarm words ALARM WORD1
(11104), ALARM WORD2 (11105), ALARM WORD3 (11106),
contain status bits for all possible DCS500B faults and alarms.
see Operating Instruction
see Appendix A - Signal list 11101/11102/11103
see Appendix A - Signal list 11104/11105/11106
The latest fault can be read out from parameter LATEST FAULT
(11107) and the latest alarm from LATEST ALARM (11108). The
parameter is also the basic index for the fault logger which consists
of 100 latest events, alarms and faults with occurrence times. The
contents of the fault logger can be read out by means of the
CMT/DCS500 Tool or panel.
DCS 500 Software Description