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Terminal wiring guidelines, functions, ratings, and
requirements
Input and Output wiring guidelines
Table 3 provides information and guidelines about the functions, ratings, and requirements for the
expansion module input and output terminals, and references guidelines for determining proper
wire sizes and cable lengths.
In addition to the wiring guidelines in Table 3, observe the following guidelines when wiring
expansion module inputs and outputs:
• Run all low-voltage wiring and cables separate from high-voltage wiring.
• All input and output cables, regardless of wire size or number of wires, should consist of
stranded, insulated, and twisted copper wires.
• Shielded cable is not required for input or output cables.
• Shielded cable is recommended for input and output cables that are exposed to high
electromagnetic or radio frequency noise.
• Inputs/outputs with cables less than 30 m (100 ft) typically do not require an offset in the
software setup. Cable-runs over 30 m (100 ft) may require an offset in the input/output software
setup.
I/O Terminal blocks, ratings, and requirements
Table 3: I/O terminal blocks, functions, ratings, requirements, and cables
Terminal block
Terminal
label
label
UNIVERSAL
+15 V
(Inputs)
INn
14
FX-PCX2721 Expansion Input/Output Module Installation Instructions
Function, ratings, requirements
15 VDC Power Source for active (3-wire)
input devices connected to the Universal INn
terminals.
Provides 100 mA total current
Analog Input - Voltage Mode (0–10 VDC)
10 VDC maximum input voltage
Internal 75k ohm Pull-down
Analog Input - Current Mode (4–20 mA)
Internal 100 ohm load impedance
Note: A current loop fail-safe jumper
can be positioned to maintain a closed
4 to 20 mA current loop, even when
the power to the expansion module is
interrupted or off.
Determine wire size
and maximum cable
length
Same as (Universal)
INn
Note: Use 3-wire
cable for devices
that source power
from the +15 V
terminal.
See Guideline A in
Table 4.
See Guideline B in
Table 4.
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