The System Bus (I-On Ex Control Units Only); Device Addressing On The Bus - Eaton i-on series Engineering Manual

i-on Range

The System Bus (i-on EX Control Units Only)

30 50 160
The system bus carries all the data between the control unit and its expanders and
keypads. Electrically the bus is a single set of four conductive paths. Two paths carry dc
power and two carry data. Physically the bus cable can connect the devices in either
daisy-chain or star arrangements – see Figure 2.
Figure 2. Bus Layout Example
See the relevant Installation Guide for details of bus configuration, maximum bus length
and cabling type. As part of programming the i-on30EX, i-on50EX and i-on160EX you will
need to understand how devices are addressed, and how to add and delete them
correctly.

Device Addressing on the Bus

Each device on the bus has a unique address. The device obtains this address from the
control unit, either during the commissioning stage of a new installation, or at some later
date under control of the Installer Menu when the installer adds the device. Once the
device has obtained a bus address, the device stores that address in non-volatile memory.
During subsequent programming at the control unit the Installer also assigns other
information to each bus device, for example allocating them to partitions, or programming
the zone types and attributes of any zones attached to expanders. The control unit stores
this information within itself (NOT within the bus device).
This means that if you need to remove a bus device, and perhaps install it on another
system then you must:
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