Parker PAC, Installation Manual, Page: 39 / 197

PACIO Power Distribution Module
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Many PACIO Modules require 24VDC to provide power to field outputs. To ensure that there is as
little cross interference as possible, do not connect the PACIO field power supply lines from one
PACIO power supply port to the next. Install a central power supply point and establish a star
topology using the shortest wires possible between the central point and PACIO Modules. To
simplify this wiring, the use of a PACIO Power Distribution 2 x 16 Module is recommended. For
more information, see page 148.
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located on the Module.
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Some PACIO Modules have under voltage monitoring, and can report this status to the control
unit.
TIP: A rapid shut-down of all PACIO outputs can be performed by externally switching-
off of the I/O supply voltage L+ .
TIP: If you need to monitor the presence of the PACIO power supply in the control
program, connect the 24VDC L+ input power to a PACIO digital input to
represent the status of the field 24VDC power.
It is recommended that the PACIO Module field wiring be properly shielded and the wiring shield be
connected to Earth ground to prevent analog or digital I/O interference.

Shielding the wiring of low voltage analog and digital I/O signals is particularly important
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Each PACIO Module contains an Earth ground bus bar for connection of an optional PACIO Shield
Connection Terminal Block (see page 149). These products are useful in grounding the I/O wiring
cable shields to Earth ground for EMI noise suppression.