5511-710 GB/12.2004/Rev. C1
7
4. M-Bus Slave for MULTICAL
®
The M-Bus Slave is a module especially developed
for MULTICAL
®
and is easily installed in the modu-
lar space.
The M-Bus Slave is supplied via the M-Bus Master,
and there is a galvanic decoupling to MULTICAL
®
,
which cannot be supplied over the M-Bus Master.
The M-Bus Slave is equipped with either two
extra in- or outputs, to facilitate remote data
acquisition from other meters, e.g. water meter
or to read out the energy and volumes pulses
from the meter itself.
The M-Bus Slave is an intelligent unit with its own
processor and RAM.
The M-Bus Slave automatically collects data from
the heat meter every 12 hours. furthermore data is
collected during reset/start as well as when data
has been sent from M-Bus Slave to M-Bus Master.
Reset is produced by decoupling the supply power
to the M-Bus system for a while (at least 1 minute).
The M-Bus Slave can also be initiated from the
M-Bus Master by sending the format SND_NKE.
Initiation means resetting the internal counters
and collecting data from the meter. When the M-Bus
Slave collects current data from the meter, commu-
nication to the M-Bus network is blocked. This inter-
val is called the initiation time, for MULTICAL
®
III it
is typically 9 seconds, whereas the typical initiation
time of a MULTICAL
®
is 12 seconds.
For the creation of M-Bus data packs the M-Bus
Slave uses the codings of MULTICAL
®
(A-B-CCC).
If the coding cannot be found in the M-Bus Slave
an error message appears which means that the
decimal point will not be correctly placed in the
M-Bus data pack.
Each M-Bus Slave has a maximum current
consumption of 1 Unit Load (1.5 mA).
R
in
= 410 Ω, C
in
= 0,5 nF.
Order numbers:
M-Bus Slave for MULTICAL
®
III/MULTICAL
®
with pulse inputs 66-04-000-100
M-Bus Slave for MULTICAL
®
III/MULTICAL
®
with pulse outputs 66-07-000-100
M-Bus Slave for MULTICAL
®
with pulse inputs 66-08-000-100
M-Bus Slave for MULTICAL
®
with pulse outputs 66-09-000-100
There is a difference between the M-Bus Slaves for MULTICAL
®
III and MULTICAL
®
.
MULTICAL
®
transmits a larger amount of data. Please refer to paragraph 10: Data acquisition of M-Bus.
Terminal 24-25 (M-Bus) M-Bus connection
Terminal 65-66 (input A) Pulse input A
Terminal 67-68 (Input B) Pulse input B
Terminal 24-25 (M-Bus) M-Bus connection
Terminal 16-17 (CE) Energy pulse
Terminal 67-68 (CV) Volume pulse
Pulse inputs Pulse outputs
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