Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 69)

Chapter 5
Wiring Your Control System
5–6
The following are general recommendations for wiring I/O devices.
!
ATTENTION: Before you install and wire I/O devices,
disconnect power from the controller and any other source to the
I/O devices.
Use acceptable wire gauge — The I/O wiring terminals are designed to
accept #14 or smaller AWG stranded wires, and two wires per terminal
(maximum). Maximum torque 0.9 N–m (8 in–lb).
Label wires — 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.
Bundle wires — 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.
Identify terminals — 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 (RTB) with appropriate slot, rack (chassis) and module
identification if you have not already. Refer to page 5–8 for more
information.
!
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.
Recommendations for Wiring
I/O Devices