ABB A43

Communication with Modbus
2CMC48001M0201 139 A43/A44
Revision: C User Manual
9.8.1 Reading Event logs
General
Readout of logs is controlled by the Entry number register or the Date/Time
register. After writing to the Entry number register or the Date/Time register, the
log entries are available in the registers of the data block. To get the next set of
entries the Get next entry register is used.
Read the 15 most
Follow the steps in the table below to read the 15 most recent log entries:
recent logs
Step
Action
1
Write the value 1 to the entry number register.
2
Read the data block.
Read the
entire history
Read forward or
backwards from
a specified date/
time
Follow the steps in the table below to read the entire history of logs,
backwards in time:
Step
Action
1
Write the value 0 to the Entry number register to make sure the reading starts
from the most recent entry.
2
Write the value 1 to the Get next entry register.
3
Read the data block.
First time this step is performed the logs in the data block are the most recent
up to the 15th most recent. Second time this step is performed the logs in the
data block are the 16th to the 30th.
4
Repeat steps 2 and 3 until there are no more entries stored. When all entries
have been read, all registers in the data block are set to 0xFFFF.
Note – The entry number register is reset to 0 after a restart.
Follow the steps in the table below to read forward or backwards in time from a
specified date/time:
Step
Action
1
Write a date and time to the Date/Time registers.
2
Write to the Direction register. Writing value 0 means backwards and value 1
means forward.
3
Read data block.
4
Write the value 1 to the Get next entry register.
5
Repeat steps 3 and 4 until there are no more entries stored. When all entries
have been read, all registers in the data block are set to 0xFFFF.
Note – The Date/time registers are reset to 0xFFFF after a restart.