3 interface assignment – Siemens PC 870 User Manual
Page 24
Description of Device
2-8
SIMATIC Panel PC 670 / 870 Operating Unit, Equipment Manual
Edition 07/01
2.3.3
Interface assignment
Table 2-2
Pin assignment of front-side USB interface
Pin
Name
Type
Remark
4
4
USB_GND
V
Chassis ground for external USB in-
terface
4
3
3
USB_D0P
B
Data+, USB channel 0
3
2
2
USB_D0M
B
Data–, USB channel 0
2
1
1
USB_P5V_fused
V
+ 5V (fused) for external USB inter-
face;
max. 100 mA, use an external power
supply for devices requiring higher
currents
Signal type
B
Bi-directional
O
Output
V
Voltage
Note
The NEMA-standard versions do not possess a front-side USB inter-
face (see Appendix: Technical Data)
Front-side USB
interface