Allen-Bradley 6181X-12TPW7DC, Руководство пользователя

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Rockwell Automation Publication 6181X-UM001C-EN-P - July 2015 19
Installation Chapter 2
Control Drawing for USB Peripheral Devices
For Class I, Division 2 and Zone 2 Required Circuit Parameters
The following control drawing is provided in accordance with the National
Electrical Code, Article 500 (Class I, Zone 2, Group IIB, and Class I, Division 2,
Groups A, B, C, and D).
Application Information
Coordinate the circuit parameters of associated field-wired apparatus for use in
hazardous locations with the host product so their combination remains
nonincendive. Treat the 6181X computers and the USB peripheral devices in this
manner.
The circuit parameters of the 6181X computer USB ports are indicated in the
previous table. The 6181X computers provide four separately powered USB ports.
Verify that the USB peripheral devices and their associated cabling have circuit
parameters with the limits listed in the table in
Control Drawing for USB
Peripheral Devices on page 19 so they remain nonincendive when used with
6181X computer USB ports.
Parameter Value Parameter Definition
V
oc (USB)
5.25V DC Open circuit voltage of each host USB port.
The maximum applied voltage rating, V
max (peripheral)
, of each peripheral device shall be
greater than or equal to V
oc (USB)
.
V
max (peripheral)
> V
OC (USB), as appropriate
I
sc (USB)
950 mA Maximum output current of each host USB port.
The maximum current, I
max (peripheral)
, to which each USB peripheral device can be subjected,
must be greater than or equal to I
sc
(USB).
I
max (peripheral)
> I
sc (USB)
C
a (USB)
20 μF This value is the maximum total capacitance that can be connected to each USB port. The
total capacitance of each USB peripheral and its cable must not exceed the indicated value.
The maximum total capacitance, C
i (peripheral),
and cable capacitance of each separate USB
peripheral device must be less than or equal to C
a (USB)
.
C
i ( peripheral)
+ C
cable
< C
a (USB)
L
a (USB)
3.11 μH This value is the maximum total inductance that can be connected to each USB port. The
total inductance of each peripheral device and its cable must not exceed the indicated value.
The maximum total inductance, L
i (peripheral),
and cable inductance of each separate USB
peripheral device must be less than or equal to L
a (USB).
L
i (peripheral)
+ L
cable
< L
a (USB)
USB Port USB Peripheral Device
USB Port USB Peripheral Device
USB Port USB Peripheral Device
USB Port USB Peripheral Device
6181X Host Product
Associated Nonincendive
Field Wiring Apparatus
Nonincendive
Field Wiring Apparatus