Page 66 - Safety engineering guidelines. Pneumatic and electric solutions

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66
Description
The use of decentralised devices
on the fieldbus – particularly
with high protection for direct
machine mounting – demands
a flexible power supply concept.
A valve terminal with CPX can
generally be supplied via a
socket for all voltages. Here,
we distinguish between
supplying the
• Electronics plus sensors
• Valves plus actuators.
The following connection types
can be selected
• 7/8“, 4 or 3-pin
• M18, 4-pin
• Push-Pull
Interlinking blocks, together
with all the power supply rails,
are the backbone of the CPX
terminal. They provide the power
supply for the CPX modules and
their fieldbus connection.
Many applications require the
CPX terminal to be separated
into voltage zones.
This is particularly true for
switching off the solenoid coils
and the ports separately. The
interlinking blocks can either
be designed as an installation-
saving centralised power supply
for the entire CPX terminal, or
they can be designed as
galvanically isolated, all-pin
disconnectable potential
groups/voltage segments.
The voltage concept of the
CPX terminal permits safe
deactivation via external safety
devices, safety control outputs
or via the integrated ProfiSafe
deactivation module.
CPX terminal – power supply concept
Please observe the legal information on page 73.