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Rockwell Automation 6181X-12TPXPDC Industrial Integrated Computers for Hazardous Locations User Manual

Page 17

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Industrial Computers for Hazardous Locations 17

Rockwell Automation Publication 6181X-IN001C-EN-P - April 2011

Control Drawing - Class I Division 2 and Zone 2 Required Circuit
Parameters for USB Peripheral Devices

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).

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 shall 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 shall 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 shall 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

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