ABB A43

Communication with Modbus
2CMC48001M0201 129 A43/A44
Revision: C User Manual
Example of data
The following table shows the relation between stored values and channels in data
block 1
block 1:
Entry
Timestamp
Channel 1
Channel 2..8
Status
Value
1
110601
0 (OK)
1000 kWh
...
00:00:00
2
110501
0 (OK)
800 kWh
...
00:00:00
3
110401
0 (OK)
450 kWh
...
00:00:00
9.6.1 Reading Previous Values
General
Read the most
recent
Readout of previous values is controlled by the Entry number register or
Date/ Time register.
After writing to any of those registers, the values of all channels for the
given entry number or date/time are available in the registers of data block 1
to 7, together with status and timestamp information.
In the data blocks, the registers Quantity, Data type and Scaler provide
further information about the data stored in each channel. To get the next
block of previous values, write the value 1 to the Get next entry register, and
then read again from the registers in the data blocks.
Follow the steps in the table below to read the most recent previous values entry:
Step
Action
1
Write the value 1 to the entry number register.
2
Read the data blocks of interest.
Read the entire
Follow the steps in the table below to read the entire history of previous values:
history
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 blocks of interest.
4
Repeat steps 2 and 3 until there are no more entries stored. When all entries
have been read, all registers in the data blocks are set to 0xFFFF.