Demand - ABB A43 User Manual

Communication with Modbus
Step
2
3
Read quantity
configuration
Follow the steps in the table below to read the current configuration of quantities
to store in previous values:
Step
1
2
3
Note –
the number of channels used is already known.
Note –
Quantity registers in step 2. The Channel number register holds the current channel
number, starting from 1 after reading the Number of channels register. It is
incremented every time the Quantity registers are read.
The Period configuration register is used to read or write the period with which
previous values are stored. The table below describes the contents of the Period
Period
configuration register:
configuration
register
Byte nr
0 (High byte)
1 (Low byte)

9.10.2 Demand

Demand configuration defines the set of quantities to store at the end of a period
General
and the number of levels for these quantities. It is also defines the period with
which values are stored, and the intervals for calculation of minimum and
maximum values.
A43/A44
User Manual
Action
Write the OBIS code for the quantity to store in the first channel to the Quantity
registers.
Repeat step 2 for all channels that shall be used, i.e. the same number of times
as the value written in step 1.
Action
Read the Number of channels register to find out how many channels are used.
Read from the Quantity registers to get the OBIS code for the quantity
configured in the first channel.
Repeat step 2 for each channel, until all OBIS codes have been read. This
means step 2 shall be performed the same number of times as the value read
from the Number of channels register
Step 1 initiates the readout procedure and can NOT be left out, even if
The Channel number register can optionally be read together with the
Description
Previous values period
Day of week, in case of weekly storage
144
Possible values
0 = Daily
1 = Weekly
2 = Monthly
1-7 (1 = Monday)
2CMC48001M0201
Revision: C