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L-Bus
The pulse outputs are open collector outputs – there is no internal
limitation of current. Depending on the level of the external supply voltage
applied, a serial resistor must be inserted between the voltage source and
pulse output.
The operating current during a pulse must not exceed 27 mA.
PLC example circuit:
One of the most frequent applications
is for feedforwarding the output pulse
to a PLC.
Pulse outputs (L-BUS module only)
Max. input voltage: 30 V
Max. input current: 27 mA
Voltage drop at active output: max.
2 V/27 mA
Current across inactive output: max.
5 µA/30 V
Max. reverse voltage without destroying
the outputs: 6 V
Pulse duration: min. 25 ms
Interpulse period: min. 25 ms
Max. pulse repetition frequency: 20 Hz
Standard pulse values:
Nominal size
[DN]
25
10 pulses
40, 50
1 pulse
80, 100, 150
1 pulse
Table 3 | L-Bus pulse value
73025026a
© Elster GmbH | All rights reserved. Subject to modification
Pulse value
for 1 m³
for 1 pulse
1 f³
10 f³
100 f³
Fig. 9 | L-Bus connection
Honeywell
21
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