Standards and certifications • Certifications
128
Automation PC 3100 user's manual V0.60
2.5.5 USB connection with the Automation PC 3100
2.5.5.1 Introduction
The information below describes the use of USB peripheral devices on USB interfaces 1, 2, 3 and 4 of the B&R
Automation PC 3100 in hazardous locations Class I, Division 2, Groups A, B, C and D.
Danger!
DANGER OF EXPLOSION
•
Before installation or use in a potentially explosive atmosphere, the explosion protection class
of the device must be checked per ANSI/ISA 12.12.01 and CSA C22.2 No. 213.
•
The following must be used to switch on/off B&R devices installed in a potentially explosive
atmosphere:
°
A switch outside the potentially explosive atmosphere, or
°
A switch that is certified in accordance with the hazardous location class and division
for "tube use"
•
As long as the electrical circuit is activated, cables or wires are not permitted to be connected or
disconnected unless the area is known to be free of ignitable concentrations of vapors, gases
and other flammable or combustible materials. This applies to all connections and switches.
This includes electrical, ground and network connections as well as series and parallel con-
nections.
•
Unshielded/Ungrounded cables are not permitted to be used in potentially explosive atmos-
pheres under any circumstances.
•
Only configurations with nonincendive USB devices are permitted to be used.
•
Doors and openings on housings must remain closed. This prevents the accumulation of for-
eign bodies within the workstation.
Failure to follow these instructions can result in death, serious injury or damage to property!
2.5.5.2 Description
Nonincendive devices (keyboards, mouse) are certified for use on the rear USB interfaces of the B&R Automation
PC 3100 (connected device) and are permitted to be connected and disconnected during operation. In addition to
the nonincendive property, devices that can be connected to the 4 USB interfaces must meet the following criteria.
The figure shows a sketch of the wiring of the USB cable:
9
8
7
6
5
1. Vcc
2. D-
3. D+
4. GND
5. StdA_SSRX-
6. St
7. GND_DRAIN
8. StdA_SSTX-
9. St
Shield GND
Connected device
Class I, Division 2
Group A, B, C, D
or non-hazardous location
Class I, Division 2
Group A, B, C, D
Nonincendive device
with field wiring
USB peripheral
devices
USB cables
USB 1 (3.0) pinout
-4
The following tables indicate the nonincendive electrical circuit parameters:
USB1, USB2, USB3 and USB4 interfaces (USB 3.0):
No-load voltage [V
oc
]
5.0 V
Short circuit current [I
sc
]
8.06 A
Associated capacitance [C
a
]
20 μF
Associated inductance [L
a
]
4.8 μH
Table 123: Nonincendive electrical circuit parameters for the USB1, USB2, USB3 and USB4 interfaces
