User Manual

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Building Technologies M-bus System CE1P5361en
HVAC Products 2 System components 08.02.2007
2.6 M-bus repeater WZC-R250
2.6.1 Introduction
The M-bus repeater is an amplifier for use in M-bus plants where long bus distances
must be covered.
2.6.2 Use
The M-bus repeater is for use in plants where extensive bus lines are required, or
where a large number of devices need to be connected, e.g. in district heating plants
that supply heat to entire sections of towns.
2.6.3 Functions
The M-bus repeater
 operates as a signal amplifier
 enables plant to be subdivided into several M-bus sections
2.6.4 Equipment combinations
Through the use of M-bus repeaters (connected in series or in parallel), the plant can
be subdivided into several M-bus segments.
A maximum of 250 M-bus devices can be connected to the M-bus repeater.
M-bus segment Maximum
number
Type
reference
Data Sheet
M-bus repeater for maximum 250 devices
1
1
)
WZC-P250
N5366
M-bus devices
250
2
)
1) This limitation applies to the M-bus output (master)
2) The SONOHEAT
®
heat meters with an M-bus module of V1.06 or higher produce a
bus load of 1.5 standard loads. A SONOHEAT
®
heat meter with an M-bus module
up to V1.06 corresponds to 1.5 devices: This means that a maximum of 250/1.5 =
1660 SONOHEAT
®
heat meters with an M-bus module up to V1.06 can be con-
nected to a WZC-P60.
All other devices and SONOHEAT
®
heat meters with an M-bus module of V2.01 or
higher represent 1 M-bus load.
Note