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Meter with M-Bus interface and 2 impulse inputs WFx54..
Devices of the type WFx54.. are equipped with an M-Bus interface. This
serves as a communication hub for transmission of the measured values to an
M-Bus control unit. In addition, the devices are equipped with 2 impulse inputs.
This allows the impulses from one or two water meters with impulse output
(Reed contact) to be recorded and transmitted to the M-Bus control unit.
dd on modules cannot be tted onto
meters of the type WFx54..
Connect control cable on the device
Pin assignment
Connection to the M-Bus
The M-Bus cable is installed on the basis of EN 13757-2.
Please note the following instructions:
• Use high-quality spring-loaded terminals or crimp connections suitable for
the cross-sections.
• Avoid unnecessary scanning of the M-Bus.
• Put the M-Bus into operation in one session if possible.
• Ensure the M-Bus has an uninterruptible power supply.
• Avoid switching the M-Bus off.
void short circuits in the
•
lations.
EN
100
A6V10816676_----_d
Impulse input 1 Pin 1: orange
Impulse input 2 Pin 1: red
M-Bus Pin 1: orange (not occupied)
Bus cable during service ork and retro t instal-
Connection impulse input
Connection to the M-Bus system
Pin 2: brown
Pin 2: black
Pin 2: brown (not occupied)
Pin 3: red
Pin 4: black
Siemens Building Technologies