M-Bus Module Mi With 2 Pulse Inputs - Landis+Gyr ULTRACOLD T550 Technical Description

Communication
9.4

M-Bus module MI with 2 pulse inputs

The M-Bus module enables the meter to communicate with an M-Bus center
in order to transmit measured values. In addition to a possible voltage supply
from the M-bus connection, the "MI" module is equipped with a battery. This
powers the module processor and the pulse input, if no M-bus voltage is ap-
plied.
M-Bus
Standard
Protocol
Electrical isolation
from the meter
from the pulse inputs
Connection
strip-back length
Connection capacity
rigid or flexible
flexible with wire end ferrule
Polarity
Voltage
Current consumption
Addressing
Baud rate
Interface description
Pulse
Number of pulse inputs
Life of the module battery
Standard for pulse inputs
Frequency
Pulse duration (low)
No-pulse duration (high)
Pulse value
Display and output
Polarity
Electrical isolation
Output voltage
Internal resistance
Source current
Pulse input closed (low)
Pulse input open (high)
Connection
Connection capacity
EN 1434-3; EN 13757-2, -3
EN 60870-5
yes
no
5 mm
0.25 ... 0.75 mm²
0.25 ... 0.75 mm²
any
50 V DC max.
1 M-Bus load (1.5 mA)
primary or secondary
300, 1200, 2400, 4800 or 9600 baud
see TKB3448
2 pulse inputs per "MI" module
5 years of operation + 1 year storage
duration;
if the M-bus voltage is applied for at
least 90% of the operating time, the
battery life increased to 10 years
Class IB per EN 1434-2
Max. 10 Hz
≥ 50 ms
≥ 50 ms
0.01 liters/pulse, in steps of 10 000.00
liters/pulse,
in steps of 0.01 liters/pulse
3
in m , 7-digit;
acc. to parameter setting with or with-
out 1 decimal place
yes, must be correct, if transmitter is of
type "open collector"
from the meter:
from the M-bus inputs:
approx. 3.3 V
approx. 1 MΩ
approx. 3 µA
Switching threshold low < 0.2 V
Resistance < 50 kΩ
Switching threshold high: unconnected
collector
Resistance ≥ 6 MΩ
Strip-back length 5 mm
30/49
yes
no