Rockwell Automation 6181X-15xxxxxxx VersaView 6181X-IN001B-MU-P - Manual (Page 15)

VersaView 6181H Integrated Display Computers 15
Publication 6181H-IN001B-MU-P
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 VersaView 1500P computer,
and the USB, and PS2 peripheral devices shall be treated in this manner.
The circuit parameters of the VersaView 1500P computer’s USB and PS2 ports are
given in Table 1. The VersaView 1500P computer provides two USB ports and one
PS2 port with a Y-cable.
The USB and PS2 peripheral devices and their associated cabling shall have circuit
parameters with the limits given in Table 2 for them to remain nonincendive when
used with the computer’s USB and PS2 ports. For the comparison of C
a
and C
i
, use
the sum of the capacitance of all connected peripheral devices and their associated
cables C
i
. For the comparison of L
a
and L
i
, use the inductance of each individual
peripheral device and its associated cable for L
i
.
If cable compliance and inductance are not known, the following values from UL
913 may be used:
C
cable
= 60 pF/ft
L
cable
= 0.20 µH/ft
Table 2 Required Circuit Parameters for USB and PS2 Peripheral Devices
Parameter Value Parameter Definition
V
max
5.25V dc
(minimum) Maximum applied voltage rating of each peripheral device. V
max
of each
peripheral shall be greater than or equal to V
oc (USB)
and V
oc (PS2)
in Table 1.
V
max (per ipheral)
≥ V
oc (USB)
and/or V
oc (PS2)
as appropriate
I
max
2.2 A
(minimum) Maximum current to which each peripheral device can be subjected. I
max
of
each peripheral shall be greater than or equal to I
sc (USB)
and I
sc (PS2)
in Table 1.
I
max (peripheral)
≥ I
sc (USB)
and/or I
sc (PS2)
as appropriate
C
i
30 µF Maximum allowed total capacitance of all peripheral devices and their
associated cables. The sum of C
i
of all simultaneously connected peripheral
devices and C
cable
of their associated cables shall be less than or equal to C
a
.
(C
i
+ C
cable
)
USB1
+ (C
i
+ C
cable
)
USB2
+ (C
i
+ C
cable
)
PS2
≤ C
a
L
i
1.7 µH Maximum allowed total inductance of each peripheral device and its
associated cable. The sum of C
L
of each peripheral device and L
cable
of its
associated cables shall be less than or equal to L
a
.
(L
i
+ L
cable
)
USB1
≤ L
a
(L
i
+ L
cable
)
USB2
≤ L
a
(L
i
+ L
cable
)
PS2
≤ L
a