Proface PS4800 - 19 Panel PC" - Manual (Page 69)

PS-4600 Series User Manual
69
Front USB Connections
Non-incendive equipment (keyboards, mouse) are permitted for use on the
Industrial Personal Computer (Associated Non-incendive Field Wiring Apparatus)
front USB 5. In addition to being non-incendive, any equipment connected to the
front USB 5 must satisfy the following criteria.
The figure shows the USB cable wiring:
Notes:
1. The following table gives the Non-incendive Circuit Parameters:
The Entity Concept allows interconnection of non-incendive apparatus with
associated apparatus – not specifically examined combinations – as a system when
the approved values of V
oc
(or U
o
) and I
sc
(or I
o
) for the associated apparatus are
less than or equal to Vmax (U
i
) and Imax (I
i
) for the non-incendive apparatus, and
the approved values of C
a
(C
o
) and L
a
(L
o
) for the associated apparatus are greater
than or equal to C
i
+ C
cable
and L
i
+ L
cable
, respectively, for the non-incendive field
wiring apparatus.
2. Non-incendive field wiring apparatus shall satisfy the following:
Circuit Parameters USB port 5
(front USB)
Open-circuit voltage = V
oc
4.96 V
Short-circuit current = I
sc
1180 mA
Associated capacitance = C
a
20
F
Associated inductance = L
a
3.21
H
Industrial Personal Computer Asso-
ciated Non-incendive Field Wiring
Apparatus - Non-incendive Field Wiring Apparatus
(Mouse, Keyboard)
V
oc
I
sc
C
a
L
a




V
max
I
max
C
i
+ C
cable
L
i
+ L
cable
USB cable
Associated Non-incendive
Field Wiring Apparatus