1.3.3 Pulse counter register 1 and 2
The calculator has two (2) pulse inputs that acts as
volume accumulators in [m³]. To set the volume
accumulators to pulse counters the pulse weight in
calculator must be set to:
1000 [l/p], 0 decimals
Example: 1000 [l/p], 0 decimals -1 m³ per pulse
(One pulse one increment of display). See also
3.3.5.1 table 3.2 for more information on sequence
13 and 14.
1.3.4 Placing of flow sensor
The calculator uses different algorithms to calculate
the energy depending on which pipe (hot or cold)
the flow sensor is placed. Always set the flow
sensor placing correctly in the calculator.
Recommended flow sensor placing is in the return
(cold) pipes, see also fig 1.1, 1.2 principle of energy
measurement, as this side normally is the “cooler
side” for the flow sensor.
The flow sensor placing can be set in the “service
mode”, see Service 7.4 or by using the “FlexServ
program” version 2 or higher.
See also 3.3.5.1 and table 3.2 for more information
on sequence 64, flow sensor placing.
1.3.5 M-Bus
The F2/3/4 calculator is equipped with M-Bus
communication. The M-Bus in the calculator is
according to M-Bus standard and the recommen-
dation according to M-Bus user group.
Battery powered calculators are sensitive and may
not be connected into loops with more than 250 M-
Bus nodes with maximum one M-Bus read once a
day, otherwise the battery life expectancy in the
calculator will be affected.
Extreme M-Bus communication, when the
calculator is flooded by the M-Bus, the calculator
will prioritize the M-Bus over the display. This
flooding will result in strange calculator display
behaviour.
Flooding of the M-Bus communication will not
affect the calculator readings.
1.3.6 Communication address
The calculator has two (2) communication add-
resses in M-Bus.
Primary address, this is a value from 1-250. The
primary address can be changed in the “service
mode”, see also service 7.4 or by using the
“FlexServ program” version 2 or higher.
When two or more meters within a M-Bus loop use
the same primary address a communication coll-
ision will occur. The primary address must be
unique for each calculator in the M-Bus loop.
“Secondary address”, is normally set to F4 serial
number (S/N).
When two or more calculators in an M-Bus loop
use the same primary address a communication
collision will occur. This is why secondary
addressing is recommended when no calculator has
the same secondary address from factory.
In most M-Bus reading programs the user can
choose to address the calculator by the primary or
secondary address. The transfer and communication
speed for the calculator will not be affected by
choosing the primary or the secondary addressing
in M-Bus.
1.3.7 Power cut
Mains powered
When the mains power is cut the calculator will run
following sequence:
1. Automatically switch over to the backup
battery.
2. Store calculator data to an EEProm.
3. Generate an error code “0000080” on display
sequence 15. See also Error Codes, 3.4 (Only
when selected in the calculator programming).
The F4 calculator has a backup battery (both mains
and battery driven calculators). This battery will
supply the calculator with power when main power
is cut. The backup battery will last up to 10 years at
normal usage of calculator, maximum one M-Bus
reading per day and normal energy values.
When power fails, the calculator stores all data to
the EEProm at dayshift. When power is cut from
both mains and backup battery and the calculator
looses all recorded data in temporary memory,
there are two (2) cases:
1. All data stored after dayshift will be lost, see
also storing values, 6.4
2. All data stored after the save by short circuit
the “Save data button” will be lost, see also 2.4
Save data button. Only when the “save data
button” is short circuit after a dayshift.
