Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 15 Communication 2017-09-29
15.7 Universal transmission and reception zones
The device RMH760B allows for the universal exchange of data via its own
terminals as well as via terminals for the extension module RMZ78x.
The data is exchanged via KNX bus from device to device.
Universal inputs, digital and analog outputs of the RMH760B can be used as
send objects (to the send zones).
Universal inputs of the RMH760B can be used as receiving objects (in the
receiving zones).
The data is exchanged as if the device terminals were hardwired.
A maximum of 32 transmission and reception zones each are permitted for each
line (for the KNX bus, see N3127, P3127).
"Allowed" and "not allowed" applications exist according to the KNX bus
specifications (e.g. send frequency).
The use of universal transmission and reception zones is allowed and makes
sense for:
• Transmission of analogue signals (e.g. temperature, 0-10V signals...) and digital
signals between multiple devices
• Further use of an input or output signal from several devices at the same time
• Controlling decentralized aggregates such as primary- or main controller in a district
heating substation
• Simple control functions that are not time-critical
• Common follow-on processing or use of bus information
The applications below or input/output variables cannot be implemented using
universal transmission and reception zones:
• Safety-relevant plants and facilities (e.g. fire alarm off, smoke extraction, frost
protection function)
• If "simultaneous start behavior of plants" is requested
• Applications where the loss of communication of transmission and reception
zones can cause damage
• Controlled systems of a time sensitive or highly complex manner
• Main controlled variable that must be present
• Recording and evaluating pulses
3-point outputs (relay N. QX) cannot be transmitted via the LTE-Sendezone (because
they are analogue outputs in % in the controller).
After switching on the RMH760B (power-up) it takes some time, before the signals
from the bus are available. This may result in fault responses on the part of the
plant for non-permitted applications of the transmission and reception zone.
The desired transmission or reception zone must be set on a terminal on the
RMH760B to activate the function. The partner device must be set in the same
manner.
The transmission/receiver procedure is a 1:n relationship, i.e. in a
transmission/reception zone, one transmitter, but multiple receivers are possible.
Function principle
Number of transmission /
reception zones
Note
Examples of allowed
applications
Examples of not allowed
applications
Important note
Note
Activation
Note