Siemens SINUMERIK 840D sl Manual page 23

USB interfaces
The USB interfaces are implemented as sockets and comply with the generally valid standard.
The version information (1.1, 2.0 etc.), the maximum velocity (low speed, full speed, etc.) and
the socket type (A or B) are documented in the individual sections for the associated devices.
In principle, USB interfaces have the following characteristics:
● Integrated power supply up to 500 mA for each socket.
● Maximum cable length 3 m (Length including the supply cable to the hub and the connected
terminal device; only 1 hub at maximum is permitted. It should be noted that some
keyboards already have a hub.)
● Hot-plugging-capable devices are connected during operation and are identified
automatically.
Note
Correct identification is only guaranteed for USB I/Os that comply to 100% with the USB
specification.
Table 1-6
Type A socket
USB sticks
If you want to connect a USB stick to the USB interface, preferably use the tested SIMATIC
USB stick 16 GB for this purpose (Article No.: 6ES7648-0DC60-0AA0). Alternatively, you can
use a USB stick with any memory size. It must, however, meet the following minimum
requirements:
● File system: FAT16 or FAT32
● Partitioning: only in PC partition format (MBR)
Operator panel front: OP 012
Manual, 09/2016, A5E36371591B
NOTICE
Cables that are too long can cause the screen to freeze
Observe the following restrictions for the USB front interface for connecting operator
panels to the keyboard, mouse or USB FlashDrive:
● Maximum cable length: 1.8 m
● Extension cables are not permissible
Assignment of the USB interface
Type B socket
General information and networking
Pin Name Type
1 P5V_fused V
2 Data-
B
3 Data+
4 GND V
1.3 Connecting
Remark
+ 5 V (fused)
Data -
Data +
Ground (reference potential)
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