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Art.No.11603-48
15
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
-
Number of 1-Wire devices
-
Type of cable installation (topology)
-
Number and design of cable connectors (unnecessary connection transitions should be avoided)
All factors in total are summarised and referred to as 1-Wire Bus load. Each increase of 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
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As linear a topology as possible without T-junctions
The topology in particular plays a major role. If possible, linear topology should be used. 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 the ECO 208 PRO.
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/
* 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
11603-48 V1.0 R1.1 Manual
Page 15 of 18