Maddalena S.p.A., Via G.B. Maddalena 2/4, 33040 Povoletto (UD)
– Italy
Tel. +39 0432.634811, Fax +39 0432.679007, Fax 39 0432.679820,
www.maddalena.it
Article no. 1080100072
– 2013-03-20
4
9.2.1. General information
The number of read-outs via the optical interface is
limited.
During communication on the M-Bus with an
addressed instrument via the M-Bus it is not
possible to use the other interfaces on the
instrument (push-button, optical interface) and vice
versa.
The valid standards for the M-Bus protocol are
EN 13757-2, EN 13757-3 and EN 1434-3 and the M-
Bus Recommendation (version 4.8 from Nov. 1997)
with the basic standard IEC 870 parts 1,2 and 4.
Each meter on the M-Bus is only protected against
high voltage up to the maximal allowed bus voltage
(±50V).
Additional protective measures must be provided by
the level converter/Master.
The installation of an instrument in a M-Bus network
may only be carried out by authorized, qualified
technical personnel.
Attention must be paid to ensure that the cable
lengths and cable cross-sections in the bus network
are appropriate for the
baud rate of the connected
meters (2400 baud)
.
Recommended cable type:
Telephone cable J-Y(ST) Y2 x 2 x 0.8 mm²
10. Error Codes
When the instrument detects an error, the
error symbol and number are displayed.
The error can also be displayed by selecting
the menu item 8) ‘error display’ in the first level / main
loop (see loop 8 display).
There are seven possible causes of error, and they can
appear in combination with each other, depending on
the situation. The description of the faults can be read
from the display.
Display
binary
Description
Display
hexadecimal
1 at 1st position
check sum fault
error 40
1 at 2nd position
E
2
PROM fault
error 20
1 at 3rd position
Reset
error 10
1 at 4th position
Time-out TDC
error 08
1 at 5th position
REF-sensor fault
error 04
1 at 6th position
RF-sensor fault
error 02
1 at 7th position
FF-sensor fault
error 01
Example: Time-out
Error
Low
B
att
er
y
Che
c
k
s
u
m
f
a
u
lt
E
2
PRO
M
fa
u
lt
Res
e
t
Ti
m
e
-o
u
t
TDC
REF
-Se
n
s
o
r f
a
u
lt
RF s
e
n
s
o
r f
a
u
lt
VF
s
e
n
s
o
r
fa
u
lt
Error code
hexadecimal
(LDC
)
Error
code
7
6 5
4
3
2
1
0
Display
Location
1 2 3 4 5 6 7 8
Binary
display
LCD
When an error occurs
in the standard display (total
heat
energy), with the exception of the „reset“ error, the
instrument must be exchanged and sent to the
manufacturer for examination.
Error Description
Error
Effect
Possible cause
ff-sensor
fault
No calculations are carried
out. The registers for flow
and energy are not being
updated (no new data is
being stored).
Sensor cable severed;
sensor cable shorted
circuited.
rf-sensor
fault
No calculations are carried
out. The registers for flow
and energy are not being
updated (no new data is
being stored).
Sensor cable severed;
sensor cable shorted
circuited t.
Internal
calibration
errors
There is no energy
calculation. The registers for
flow and energy are not
being updated (no new data
is being stored).
A defect on the calculator
circuit board.
Time-out
TDC
No calculations are carried
out. The registers for flow
and energy are not being
updated (no new data is
being stored).
1. No water in flow sensor
2. Air in medium
3. Transducer/cable defect
reset
The measurements since
the last storage of data in
the E
2
PROM are lost (max.
one day)
EMC
E
2
PROM
fault
After a reset, the instrument
is without function.
Defective component.
check
sum fault
No calculations are carried
out. The registers of flow
and energy are not being
updated.
Defective component.
