Using a field multiplexer in the field multiplexer system
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Using a field multiplexer in the field multiplexer system
The field multiplexer is a simple system for the transmission of signals between remote
stations. It has a modular design, and saves on conventional parallel cabling.
A field multiplexer system is set up using two
identical
field multiplexers. The multiplexers
are electrically linked over a 2-wire cable and may transmit digital and analog signals over
a distance of up to 12 km.
Data can also be transmitted over fiber optics, telephone lines, Bluetooth or Ethernet. In
these cases other maximum distances are possible (see Section “Transmission media” on
2.1
Arrangement of a field multiplexer system
The field multiplexer and the Inline I/O terminals connected to it form a station. A field
multiplexer system consists of two stations. The two stations must be arranged in such a
way that each input terminal is assigned to an output terminal on the other side, and vice
versa (complementary arrangement, see Figure 2-1).
In addition to the complementary arrangement of I/O terminals in each station and its
counterpart, a distinction must be made between the active (master) and the passive (slave)
field multiplexer station. This is done by inserting a jumper into one of the stations, which
thereby becomes the master. Further configuration settings are not required.
Up to 32 Inline I/O terminals can be connected to a field multiplexer station simply by
mounting them next to one another.
The intelligent wiring method used by Inline terminals enables the field multiplexer station to
be created quickly and easily, since, for example, time-consuming wiring of the terminal
power supply is not required. It is only necessary for the power supply units integrated in the
field multiplexers to be supplied with 24 V DC on the input side. They generate the operating
voltage required for the field multiplexer
and
the connected Inline I/O terminals.
Figure 2-1
Complementary arrangement of I/O terminals
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