Wiring And Safety Guidelines - Allen-Bradley 2711P-RDT12H Installation Instructions Manual

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Symbol Definitions
V Open circuit voltage of the host USB port.
oc
I Maximum output current of the host USB port.
sc
Maximum applied voltage rating of the USB peripheral device.
V
max
V
max
Maximum current to which the USB peripheral device can be subjected.
I
max
I shall be greater than or equal to I
max
C Maximum internal capacitance of the USB peripheral device.
i
Maximum allowed capacitance of the USB peripheral device and its associated cable. The sum of C
C
a
peripheral device and C
L Maximum internal inductance of the USB peripheral device.
i
Maximum allowed inductance of the USB peripheral device and its associated cable. The sum of L
L
a
peripheral device and L

Wiring and Safety Guidelines

Use publication NFPA 70E, Electrical Safety Requirements for Employee Workplaces, IEC
60364 Electrical Installations in Buildings, or other applicable wiring safety requirements for the
country of installation when wiring the devices. In addition to the NFPA guidelines:
• connect the device and other similar electronic equipment to its own branch circuit.
• protect the input power by a fuse or circuit breaker rated at no more than 15 A.
• route incoming power to the device by a separate path from the communication lines.
• cross power and communication lines at right angles if they must cross.
• Communication lines can be installed in the same conduit as low level DC I/O lines
(less than 10V).
• shield and ground cables appropriately to avoid electromagnetic interference (EMI).
• Grounding minimizes noise from EMI and is a safety measure in electrical installations.
For more information on grounding recommendations, refer to the National Electrical Code
published by the National Fire Protection Association.
For more information, refer to Wiring and Grounding Guidelines for PanelView Plus Devices
Technical Data, publication 2711P-TD001. You can locate this publication in the literature
library at this website a
8
shall be greater than or equal to V
of the associated cable shall be less than or equal to C
cable
of the associated cable shall be less than or equal to L
cable
http://www.rockwellautomation.com/literature/.
Rockwell Automation Publication 2711P-IN026H-EN-P - May 2018
in Table 1 (V ≥ V ).
oc max oc
in Table 1 (I ≥ I ).
sc max sc
of the USB
i
(Ci + C ≤ C ).
a cable a
of the USB
i
(L + L ≤ L ).
a i cable a