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USB 2 interface (USB 2.0):
No load voltage [V
]
oc
Short circuit current [I
]
sc
Associated capacitance [C
]
a
Associated inductance [L
]
a
The unity concept allows the interconnection of nonincendive devices with connected devices without specifically
verified combinations as the system. For this, the permitted values of V
device must be less than or equal to V
of C
(C
) and L
(L
) for the connected device must be greater than or equal to C
a
o
a
o
nonincendive device with field wiring.
Where C
= 196.85 pF/m (60 pF/ft), if unknown
Cable
Where L
= 0.656 μH/m (0.20 μH/ft), if unknown
Cable
B&R device (associated device)
V
oc
I
sc
C
a
L
a
Wiring must follow national regulations and meet all legal requirements.
The B&R device must be installed in a suitable protective housing. For installations in Class I, Division 2 Hazardous
Locations, the housing must be able to withstand one or more Division 2 wiring methods.
Warning!
• Substitution of components may impair suitability for Division 2 or Division 1 hazardous (clas-
sified) locations.
• Do not energize or disconnect the device while the area is known to be hazardous.
• The associated nonincendive field wiring apparatus shall not be connected in parallel unless
permitted by the associated nonincendive apparatus approval.
The B&R device is suitable for use in Class I, Division 2, Groups A, B, C and D. It also offers nonincendive field
wiring for devices in Class I, Division 2, Groups A, B, C and D.
Panel PC 2100 user's manual V1.11
513 V
2060 mA
20 μF
4.8 μH
Table 229: Nonincendive circuit parameters for rear USB 2 interface
(U
) and I
max
i
Table 230: Associated nonincendive field wiring apparatus
Standards and certifications • Certifications
(or U
oc
(I
) for the nonincendive device, and the permitted values
max
i
-
Associated nonincendive field wiring apparatus (mouse, keyboard)
≤
V
max
≤
I
max
≥
C
+ C
i
Cable
≥
L
+ L
i
Cable
) and I
(or I
) for the connected
o
sc
o
+ C
and L
+ L
i
Cable
i
Cable
for the
253
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