MBHL-2/4 are simplified microcontroller pulse counters with
m-bus interface. Their purpose is to connect in m-bus network
devices, which do not have m-bus (usually water- and heat-
meters with pulse output). MBHL-2/4 have m-bus interface and
up to 4 pulse inputs, but no display, keyboard and tariff
possibilities are provided. Backup battery is an option. Functionally
these counters are same as MBHS, but are not in an enclosure
for DIN-rail. The enclosure is for wall mounting, with IP-54.
The other difference with MBHS is that this type of counters
are cheaper due to the cost-effective enclosure.
user
manual
| nominal net voltage |
36 VDC |
| allowable net voltage |
12 ÷ 42V DC |
| nominal power consumption |
2mA (1 and 1/3 standard m-bus loads) |
| number of pulse inputs |
2 or 4 |
| display |
none |
| max input frequency |
20Hz |
| pulse switch requirements |
Ron < 5k, Roff > 500k, up to 25m cable length
|
| dimensions (H/W/D) |
74x74x40mm |
| work temperature |
from 0° C to +50° C |
МBHL-2/4 are simplified 2- or 4-input pulse counters, intended
to connect in m-bus network tax instruments or other devices,
which do not have m-bus interface, but pulse outputs. These
counters do not have display, keyboard or RTC (means there
is no way to program different tariffs). Their purpose is
to optimize prices for remote reading in civil buildings,
still offering excellent quality. One MBHL-2/4 can connect
maximum of 2 or 4 devices with pulse output to m-bus network.
Standard device is powered through the network. Normally
when power supply fail if no backup battery provided, MBHL
counters write current pulses in flash memory. Then when
power supply is restored continue to count pulses from that
position. Backup battery is an option. This backup battery
assures from 40 to 60 days normal mode of operation work
time w/o external power supply. When network voltage is
up again, the battery is recharged to full capacity.
Caution has been taken to prevent any eventual attempts
for manipulating data. For this purpose pulse counters do
not allow main parameter changing - except the first and
only set-up of unique net address. It is not allowed to
write in the internal memory via m-bus net, the user can
only read the count of pulses of every input channel. If
the device is locked any other parameter programming is
also forbidden. Anyway, if not locked devices can be set
with unique ID on each input, making it easier to find in
m-bus network through secondary address search.
