Siemens SIMATIC PN/M-Bus LINK - Status Byte in Cyclic IO Image

Diagnostics
10.1 Status LEDs
PN/M-Bus LINK
44 Operating Instructions, 03/2018, A5E44260928-AA
10.1.3
Connection status of Ethernet interfaces
The LEDs for indicating the connection status of the Ethernet interfaces are located under a
housing flap.
Figure 10-3 Status LEDs, Ethernet interfaces
LINK
Indicates whether there is a physical connection on the Ethernet level.
On
Connection exists
Off
No connection exists
Rx/Tx
Indicates whether a packet is being sent or received
On
PN/M-Bus LINK sends or receives a packet
Off
No packet is sent or received