Softing PBpro ETH - Page 11

Chapter 2 - Installation
PBpro ETH - User Guide
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PB 1, PB 2, ...
The "PB" LED shows the bus activity of the corresponding interface:
Master: The LED is on as soon as the master has received the token.
Slave: The LED indicates the status data exchange.
Note
The LED may also light up if the bus has not been connected or is defective.