GE Industrial Solutions A Series Lighting Control Panelboards Modbus Register Map - Manual (Page 46)

A Series ® Lighting Controller Modbus Register Map
Compact Event Log
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Compact Event Log
The Lighting Controller uses an object known as the
compact event log to store system events. This is a first-in,
first-out rotary buffer with a depth adjustable to a
maximum of 1500 events. Each event has eight
components that can be reported. If the buffer overflows,
the oldest event is discarded to make room for the latest. A
register is available that contains the number of events in
the log. If the log is empty and an attempt is made to read
out an event, an exception is returned. Events are read
using Function Code 04.
Event Definitions
Table 80 lists the types of events that can be present in the
compact event log. Asking for more events than are
present in the event log causes an exception. Read register
20001 and 20002 to get the number of events and ask for
12n registers to get the n
th number of entries.
Offset Modbus reg. DB size Property Format Range Type
0 20001- 20002 Byte Total Events Int 1 – 1500 R
Alarm Output Ref.
2 20003 Word Device No Word 0 - 65535 R
3 20004 Word Object Type Word 0 – 65535 R
4 20005 Word Object Instance Word 0 – 65535
BO= 4
BV= 5 R
5 20006 Byte Alarm Ack Int 0/1 R
6 20007- 20008 Byte Alarm Values Int 0 - 65535,
0 - 65535 R
Array of
1500 Event Entries
8 20009 Hrs/Mins Int 0 – 23 | 0 - 59 R
9 20010 Seconds/Hundredths of sec Int 0 – 59 | 0 - 99 R
10 20011 Week of Day / Day Int 0 – 07 | 0 – 31 R
11 20012 Month / Year Int 0 – 12 | 0 – 99 R
12 20013 Event Type Int Enum R
13 20014 Event Argument Int Enum R
Event Object Ref.
14 20015 Object Type WORD 0 – 65535 R
15 20016 Object Instance WORD 0 – 65535 R
16 –
12007 20017 –
32008 1499 more Event entries
(8 registers per entry)
12007 registers per CEL
Table 79. Registers comprising the compact event log.
Each event record is a block of eight registers starting
from 20009. Note that these registers are read only. The
Alarm Output Ref and Alarm Ack properties are editable.
Note that if Alarm Output Reference does not exist, all
three registers are filled with 0xFFFF.
Compact Event Log Registers
The registers of the compact event log are listed in Table
79.