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Art. No. 11216
11
1-Wire Network, Cabling
The special feature of the 1-Wire system is the "BUS technology". All devices (sensors and actuators) are
operated in parallel on a three-wire line, which is used for both power supply and data communication. The
1-Wire Bus system joins the list of other successful bus systems such as CAN or Modbus RTU. All of the
installation principles recommended for these are also applicable and appropriate to 1-Wire.
The maximum size of a 1-Wire network is determined by various factors. These are mainly:
-
Total cable length and cable type
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Number of 1-Wire devices
-
Type of cable installation (topology)
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Number and design of cable connectors (unnecessary connection transitions should be avoided)
All factors in total are summarised and designated as 1-Wire Bus load. Each increase in a factor increases the
total 1-Wire Bus load for the 1-Wire Controller and thus reduces the maximum network size.
According to our many years of experience and a lot of feedback from customers, the following conservative
recommendation can be made:
-
Maximum cable length 50 -120m
-
Number of 1-Wire devices no more than 20 -22 pieces
-
As linear a topology as possible without T-junctions
The topology in particular plays a major role. If possible, it should be installed in a linear topology. The linear
topology can be compared like pearls on a pearl necklace. The data line should be laid from one device to the
next without T-joints.
Furthermore, the type of cable used can also be mentioned here. We recommend for the cabling
CAT5 or CAT6 network cable. It is also possible to use J-Y(St)Y telephone cables and KNX cables. Longer cable
runs are possible with CAT5 versus CAT7 cables.
With twisted pair cables, a longer connection length can be achieved in an undisturbed environment, as the
capacitive bus load is lower. A total length of 50 m and more can be easily achieved without additional measures.
In disturbed, commercial and industrial environments, the cable should always be shielded in order to increase
the "robustness" or interference sensitivity of the system.
Note
The above statements on 1-Wire are hints and tips and do not describe any product property or represent
any guaranteed product property of this article and the 1-Wire Controllers.
Information on the basics and tips on the 1-Wire Bus system can also be found in the ESERA Online Shop
under
https://www.esera.de/1-wire-grundlagen/
12
Operating conditions
The module may only be operated at the voltages and under the ambient conditions specified for it. The operating
position of the device is arbitrary. The device is intended for use in dry and dust-free rooms.
If condensation forms, an acclimatization time of at least 2 hours must be allowed.
Assemblies and components do not belong in the hands of children!
The modules may only be put into operation under the supervision of a qualified electrician.
In commercial facilities, the accident prevention regulations of the German Federation of Institutions for Statutory
Accident Insurance and Prevention for electrical systems and equipment must be observed.
Do not operate the module in an environment where flammable gases, vapors or dusts are present or may be
present.
* if the sensor or actuator supports Auto-E-Connect. For details, please refer to the operating instructions of the sensor or actuator.
All rights reserved. Reproduction as well as electronic duplication of this user guide, complete or in part, requires the written consent of
ESERA GmbH. Errors and technical modification subject to change. ESERA GmbH 2021
www.esera.de
11216 V5.0 R1.0 Manual
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