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e.bloxx D1-1, D1-4
MOUNTING e.bloxx AND CONNECTING WIRES
15
HB_EBLOXX-D1_E_V18.doc
Gantner Instruments Test & Measurement GmbH
Picture
3.2. - Bus Connection of an e.bloxx D1-1 to the RS 485 Fieldbus with Derivation
Picture
3.3. - Bus Connection of an e.bloxx D1-1 to the RS 485 Fieldbus via Stub Cable
The stub-cable should be as short as possible, not longer than 30 cm.
Notice:
The terminal designations A and B of all modules of the e.bloxx series
are exchanged compared with the
PROFIBUS-definitions. Consequently, in multi-vendor systems the bus lines A and B have to be exchanged
when connecting them to the e.bloxx.
Bus
Structure
The bus structure is a line structure where each bus segment will be terminated with characteristic impedance on both
ends. Branches can be set up by means of a bi-directional signal amplifier, so-called repeaters. Other types of branches
are not permitted (no tree topology). The max. stub-length to a user must not exceed 30 cm.
The following pictures show a few examples of possible bus topology structures. The meanings of the symbols are as
follows: