Installation
Operating Manual XCx 300 / 500 / 540 Version 09/08
23
Connecting the power supply
The diagram shows a bus coupler with expansion modules of the RIO
8 I/O type.
For details on the diagram refer to the following section.
Connecting the DIN rail to ground (1)
The DIN rail which holds the modules must have a broad-surface
connection to ground providing adequate conduction.
Connecting the expansion modules to ground (2)
The 8 I/O expansion module have a connecting terminal marked with
the ground symbol. To increase interference immunity this terminal
must be connected to ground (or PE potential) with a conductor which
is as short as possible (2.5mm
2
).
The contact spring located in the module clamp base is used to divert
EMC interference. This spring provides the connection between the
PCB shield potential and the DIN rail. Do not fit modules without a
contact spring or with a defective contact spring.
Relaying the power supply (3)
To provide an optimum wiring the power supply can be relayed from
one module to the next. When using modules with digital outputs the
current on each relay terminal must not exceed a specific value. If the
maximum current is exceeded an additional power supply feed must
be provided (see below).
