Phoenix Contact 2861205, User Manual

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Description of the field multiplexer
5981_en_06 PHOENIX CONTACT
15
3 Description of the field multiplexer
3.1 General description
Functions The field multiplexer
– forms the head of an field multiplexer station. All the necessary Inline I/O terminals are
connected to it.
– configures the station and manages data exchange with the opposite station over a
remote bus cable.
– supplies power to the connected I/O terminals.
The field multiplexer generates the logic voltage U
L
for all connected devices from the
supplied supply voltage U
MUX
as well as the supply voltage U
ANA
for the connected
analog terminals.
Indicators See Section “Diagnostic indicators” on page 17.
Connections See Section “Terminal point assignment” on page 18.
Connection method The field multiplexer is suitable for the connection of copper cables.
Connect cables with diameters of 0.08 mm
2
through 1.5 mm
2
(AWG 24 - 16) to the spring-
clamp connections of the Inline connectors.
In order to implement data transmission over other transmission media, additional interface
converters from Phoenix Contact must be used (see Section “Transmission media” on
page 41 or Section “Technical appendix: The field multiplexer with different transmission
media” on page 67).
Protection The field multiplexer has protection against polarity reversal and excess voltage on U
MUX
.
Potential and data routing The potential and data routing of the field multiplexer station begins at the field multiplexer.
Connection to functional
earth ground (FE)
If the remote bus cable is shielded, the shield is internally connected through a capacitor to
FE.
In the terminal, there is a capacitive connection of U
MUX
, U
M
, U
S,
and GND to FE.
Please refer to the IL SYS INST UM E user manual for information on the individual circuits
within an Inline station, which also apply for a field multiplexer station.
Please refer to the IL SYS INST UM E user manual for detailed information on the
individual jumpers as well as on the maximum capacity of the jumper contacts.