ABB A43 User Manual page 135

Communication with Modbus
Follow the steps in the table below to read the most recent historic demand entry:
Read the most
recent historic
Step
entry
1
2
Read part of or the
Follow the steps in the table below to read part of or the entire demand:
entire demand
Step
1
2
3
4
Note –
Follow the steps in the table below to read forward or backwards in time from a
specified date/time:
Read forward or
Step
backwards from
1
a specified date/
2
time
3
4
5
Note –
2CMC48001M0201
Revision: C
Action
Write the value 1 to the entry number register.
Read the data blocks of interest.
Action
Write the value for the starting entry number. Entry number 0 makes the
reading to start with current demand and 1 makes the reading to start with most
recent historic entry.
Read the data blocks of interest.
Write the value 1 to the Get next entry register.
Repeat steps 2 and 3 as many times as required or until there are no more
entries stored. When all entries have been read, all registers in the data blocks
are set to 0xFFFF.
The entry number register is reset to 0 after a restart.
Action
Write a date and time to the Date/Time registers.
Write to the Direction register. Writing value 0 means backwards and value 1
means forward.
Read the data blocks of interest.
Write the value 1 to the Get next entry register.
Repeat steps 3 and 4 until there are no more entries stored. When all entries
have been read, all registers in the data blocks are set to 0xFFFF.
The Date/time registers are reset to 0xFFFF after a restart.
135 A43/A44
User Manual