
B: Modbus Map and Retrieving Logs
Doc# E149701 MM-38
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Description (Note 1) Format Range (Note 6) Units or Resolution Comments # Reg
Modbus Address
Hex Decimal
read/write except as noted
C34C - C34D 49997 - 49998 Log Retrieval Session Duration UINT32 0 to 4294967294 4 msec 0 if no session active; wraps around after max count 2
C34E - C34E 49999 - 49999 Log Retrieval Session Com Port UINT16 0 to 4 0 if no session active, 1-4 for session active on COM1 -
COM4
1
C34F - C34F 50000 - 50000 Log Number, Enable, Scope UINT16 bit-mapped
nnnnnnnn esssssss
high byte is the log number (0-system, 1-alarm, 2-
history1, 3-history2, 4-history3, 5-I/O changes, 10-PQ,
11-waveform
e is retrieval session enable(1) or disable(0)
sssssss is what to retrieve (0-normal record, 1-
timestamps only, 2-complete memory image (no data
validation if image)
1
C350 - C350 50001 - 50001 Records per Window or Batch, Record Scope
Selector, Number of Repeats
UINT16 bit-mapped
wwwwwwww snnnnnnn
high byte is records per window if s=0 or records per
batch if s=1, low byte is number of repeats for function
35 or 0 to suppress auto-incrementing; max number of
repeats is 8 (RTU) or 4 (ASCII) total windows, a batch is
all the windows
1
C351 - C352 50002 - 50003 Offset of First Record in Window UINT32 bit-mapped
ssssssss nnnnnnnn
nnnnnnnn nnnnnnnn
ssssssss is window status (0 to 7-window number, 0xFF-
not ready); this byte is read-only.
nn…nn is a 24-bit record number. The log's first record
is latched as a reference point when the session is
enabled. This offset is a record index relative to that
point. Value provided is the relative index of the whole or
partial record that begins the window.
2
C353 - C3CD 50004 - 50126 Log Retrieve Window UINT16 see comments none mapped per record layout and retrieval scope, read-only 123
Block Size: 130
read only
Alarm Log Status Block
C737 - C738 51000 - 51001 Log Size in Records UINT32 0 to 4,294,967,294 record 2
C739 - C73A 51002 - 51003 Number of Records Used UINT32 1 to 4,294,967,294 record 2
C73B - C73B 51004 - 51004 Record Size in Bytes UINT16 14 to 242 byte 1
C73C - C73C 51005 - 51005 Log Availability UINT16 none 0=available,
1-4=in use by COM1-4,
0xFFFF=not available (log size=0)
1
C73D - C73F 51006 - 51008 Timestamp, First Record TSTAMP 1Jan2000 - 31Dec2099 1 sec 3
C740 - C742 51009 - 51011 Timestamp, Last Record TSTAMP 1Jan2000 - 31Dec2099 1 sec 3
C743 - C746 51012 - 51015 Reserved Reserved 4
Individual Log Status Block Size: 16
C747 - C756 51016 - 51031
System Log Status Block
16
C757 - C766 51032 - 51047
Historical Log 1 Status Block
16
C767 - C776 51048 - 51063
Historical Log 2 Status Block
16
C777 - C786 51064 - 51079
Historical Log 3 Status Block
16
Log Retrieval Section
Log Retrieval Block
Log Status Block
same as alarm log status block
same as alarm log status block
same as alarm log status block
same as alarm log status block
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