Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 115)

Publication 1747-UM011G-EN-P - June 2008
Wiring Your I/O Modules 115
Recommendations for
Wiring I/O Devices The following are general recommendations for wiring I/O devices.
• Use acceptable wire gauge. The I/O wiring terminals are
designed to accept two wires per terminal (maximum) of the
following size wire:
– Europe: 2 mm
2
cross section or smaller
– United States: 14 AWG or smaller stranded wires
• See diagram on page 116 for maximum torque values for wiring
terminal screws and terminal block screws.
• Label wiring to I/O devices, power sources, and ground. Use
tape, shrink-tubing, or other dependable means for labeling
purposes. In addition to labeling, use colored insulation to
identify wiring based on signal characteristics. For example, you
may use blue for dc I/O wiring and red for ac I/O wiring.
• Route the wires down and away from the module, securing
them with the cable tie.
• Bundle wiring for each similar I/O device together. If you use
ducts, allow at least 5 cm (2 in.) between the ducts and the
controller so there is sufficient room to wire the devices.
• Terminal cover plates have a write-on area for each terminal.
Use this area to identify your I/O devices. Label the removable
terminal block if you have not already.
ATTENTION
Before you install and wire I/O devices, disconnect power from
the controller and any other source to the I/O devices.
ATTENTION
Calculate the maximum possible current in each power and
common wire. Observe all local electrical codes dictating the
maximum current allowable for each wire size. Current above
the maximum ratings may cause wiring to overheat, which can
cause damage.
Capacitors on input modules have a stored charge that can
cause a non-lethal shock. Avoid mounting the controller in a
position where installation or service personnel would be in
danger from startle reaction.