Rockwell Automation 2711P-RDT12H High-bright Display Module - Manual (Page 8)

8 High-bright Display Modules
Publication 2711P-IN026E-EN-P - September 2008
Application Information
Per the National Electrical Code the circuit parameters of nonincendive field wiring
apparatus for use in hazardous locations shall be coordinated with the associated
nonincendive field wiring apparatus such that their combination remains
nonincendive. The PanelView Plus 700 to 1500 and the USB peripheral device shall
be treated in this manner.
The circuit parameters of the PanelView Plus 700 to 1500 USB port are given in
Table 1. The USB peripheral device and its associated cabling shall have circuit
parameters with the limits given in Table 2 for them to remain nonincendive when
used with the PanelView Plus 700 to 1500 USB port. If cable capacitance and
inductance are not known the following values from ANSI/ISA-RP 12.06.01-2003
may be used:
C
cable
= 60 pF/ft
L
cable
= 0.20 µH/ft
Nonincendive field wiring must be wired and separated in accordance with
501.10(B)(3) of the National Electrical Code (NEC) ANSI/NFPA 70 or other local
codes as applicable.
This associated nonincendive field wiring apparatus has not been evaluated for use
in combination with another associated nonincendive field wiring apparatus.
Symbol Definitions
V
oc
Open circuit voltage of the host USB port.
I
sc
Maximum output current of the host USB port.
V
max
Maximum applied voltage rating of the USB peripheral device.
V
max
shall be greater than or equal to V
oc
in Table 1 (V
max
≥
V
oc ).
I
max
Maximum current to which the USB peripheral device can be subjected.
I
max
shall be greater than or equal to I
sc
in Table 1 (I
max
≥
I
sc
).
C
i
Maximum internal capacitance of the USB peripheral device.
C
a
Maximum allowed capacitance of the USB peripheral device and its associated cable. The
sum of C
i
of the USB peripheral device and C
cable
of the associated cable shall be less
than or equal to C
a
(C
i
+ C
cable
≤
C
a
).
L
i
Maximum internal inductance of the USB peripheral device.
L
a
Maximum allowed inductance of the USB peripheral device and its associated cable. The
sum of L
i
of the USB peripheral device and L
cable
of the associated cable shall be less than
or equal to L
a
(L
i
+ L
cable
≤
L
a
).