Allen-Bradley PanelView Plus 6 1000, Руководство пользователя

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26 Rockwell Automation Publication 2711P-UM006A-EN-P - November 2010
Chapter 2 Install Terminal
The circuit parameters of the PanelView Plus 6 USB ports are given in Table 21
on page 25 . The USB peripheral device and its associated cabling shall have
circuit parameters with the limits given in Table 22 on page 25 for them to
remain nonincendive when used with the PanelView Plus 6 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
= 197 μF/m (60 μF/ft)
L
cable
= 0.7 μH/m (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.
Outdoor Installation for
High-bright Displays When using a high-bright display module outdoors, catalog number
2711P-RDT12H, there are important considerations in maximizing the field-life
of the front bezel and display:
•
Using an antiglare overlay and visor
•
Selecting the proper enclosure
•
Using the proper orientation of the terminal
Ultraviolet and infrared radiation can reduce the field life of any electronic
device. While the materials used in the terminal bezels provide long field life, that
field life can be extended by proper installation.
Table 23 - 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
).
IMPORTANT
The high-bright display module is compatible only with DC-powered
logic modules, catalog numbers 2711P-RP8D, 2711P-RP8DK,
2711P-RP9D, 2711P-RP9DK. It cannot be used with AC-powered logic
modules.