Data Sheet for Product

Smart Infrastructure

CE2N5324en

2021-03-

NOTICE

Module WZU-MB G4 can be used in both slots. Always plug module WZU-MI into slot 1.

M-bus module with 2 pulse inputs

WZU-MI

Function description

In addition to the M-bus connection facility, the WZU-MI module has 2 pulse inputs to con-

nect metering pulses from hot and cold water meters with Reed contact, relay or open collec-

tor. The cumulated volume is calculated based on the pulses and the set pulse valency,

stored in the processor unit at 5-minute intervals and passed on via M-bus.

NOTICE

The volume values calculated by the meter from the pulse inputs cannot be officially cali-

brated.

In addition to possible power supply from the M-bus connection, the WZU-MI module is

equipped with a battery. It powers the module processor and the pulse input, if no M-bus

voltage is applied. Either isolated contacts (e.g. relay or Reed contacts) or electronic trans-

mitters (open collectors) can be used as pulse transmitters for the pulse inputs. If an open

collector circuit is used as the transmitter of the pulse inputs, the cable must always be elec-

trically isolated from the M-bus inputs of the WZU-MI module.

BACnet/Modbus module

WZU-485E-BAC

WZU-485E-MOD

The processor unit uses both modules to communicate over ModBus® or BACnet

The ModBus® module is suitable (and preconfigured) for data transmission per the Mod-

Bus®-RTU protocol over RS485.

The BACnet

module is suitable (and preconfigured) for data transmission per the BAC-

net

protocol over RS485 and BACnet

MS/TP.