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Modbus Event Data Mapping (Status + Time Stamp)
Event data may be read in blocks of 10 events at a time. These appear in a block of 60 registers (6
per event). Once ten events are read then the registers are reloaded with any subsequent ones from
the event buffer until all events are retrieved. If no event has occurred, then all sixty registers are filled
with FF HEX.
The event data format is as shown below:
16-bit
Word
1
2
3
4
5
6
An example of the register format for 10 events is shown below.
Modbus
Event
Address
#
41001
41002
41003
1
41004
41005
41006
41007
41008
41009
2
41010
41011
41012
41055
41056
41057
10
41058
41059
41060
Appendix B
MSB
(bit positions 8 - 15)
Year
Day
Minute
Input Point Number
IRIG-B Status
[0 = off, 1 = on]
MSB (bit positions 8 - 15)
Year [0-99]
Day [1-31]
Minute [1-60]
Input Point Number [1-1200]
IRIG-B Status [0 = off, 1 = on]
Year [0-99]
Day [1-31]
Minute [1-60]
Input Point Number [1-1200]
IRIG-B Status [0 = off, 1 = on]
Year [0-99]
Day [1-31]
Minute [1-60]
Input Point Number [1-1200]
IRIG-B Status [0 = off, 1 = on]
LSB
(bit positions 0 - 7)
Month
Hour
Second
Millisecond
Input Status
[0= Alarm, 1=Normal]
Modbus Data
LSB (bit positions 0 - 7)
Millisecond [0-999]
Input Status [0= Alarm, 1=Normal]
Millisecond [0-999]
Input Status [0= Alarm, 1=Normal]
Millisecond [0-999]
Input Status [0= Alarm, 1=Normal]
Month [1-12]
Hour [1-24]
Second [1-60]
Month [1-12]
Hour [1-24]
Second [1-60]
Month [1-12]
Hour [1-24]
Second [1-60]
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