
Publication 2711P-UM001G-EN-P - September 2007 31
Installation Chapter 2
Application Information
Per the National Electrical Code, the circuit parameters of associated
field-wired apparatus for use in hazardous locations shall be
coordinated with the host product such that their combination
remains nonincendive. The PanelView Plus terminal and the USB
peripheral device shall be treated in this manner.
The circuit parameters of the PanelView Plus USB ports are given in
Table 2.1. The USB peripheral device and its associated cabling shall
have circuit parameters with the limits given in Table 2.2 for them to
remain nonincendive when used with the PanelView Plus USB port. If
cable compliance and inductance are not known, use the following
values from UL 913:
C
cable
= 60 pF/ft
L
cable
= 0.20 µH/ft
Table 2.2, Required Circuit Parameters for the USB Peripheral Device
Parameter Value Parameter Definition and Application Requirement
V
max
5.25V dc Maximum applied voltage rating of the USB peripheral device.
V
max
shall be greater than or equal to V
oc
in Table 2.1 (V
max
≥
V
oc ).
I
max
1.68 A Maximum current to which the USB peripheral device can be
subjected. I
max
shall be greater than or equal to I
sc
in Table
2.1
(I
max
≥ I
sc
).
C
a
10 µF Maximum allowed capacitance of the USB peripheral device
and its associated cable. The sum of C
int
of the USB peripheral
device and C
cable
of the associated cable shall be less than or
equal to C
a
(C
int
+ C
cable
≤ C
a
).
L
a
15 µH Maximum allowed inductance of the USB peripheral device
and its associated cable. The sum of L
int
of the USB peripheral
device and L
cable
of the associated cable shall be less than or
equal to L
a
(L
int
+ L
cable
≤ L
a
).
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