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1.7
USB interface
Interface assignment
USB socket from above:
Figure 1-2
Signal description
Pin no.
1
2
3
4
Note
If several USB devices are being operated on the PC, this can impair the performance of the
PC Adapter USB A2. To achieve optimum performance in the functions for communicating
with the S7 automation system, remove all USB devices you do not require.
NOTICE
Disrupted function or communication abort possible
Removing and inserting USB devices can cause functional disruptions on the USB interface.
In extreme situations, this can lead to the communication via the PC Adapter USB A2 being
aborted meaning that the application needs to be restarted.
PC Adapter USB A2
Operating Instructions, 07/2022, C79000-G8976-C293-03
USB interface
Signal
+5V
-Data
+Data
Ground
Description of the device
1.7 USB interface
Meaning
Supply voltage
- differential signal
+ differential signal
Ground
13
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