Pilz PSSu H FS SN SD - Manual (Page 27)

Operation
Operating Manual PSSu H FS SN SD(­T)(­R)
1001451­EN­08 27
8.2.7 X3: LNK, X3: TRF, X4: LNK, X4: TRF
A PSSu system can have either one Ethernet interface (X3) or two Ethernet interfaces X3
and X4 (see Ethernet interface). An Ethernet interface is assigned two status LEDs on the
head module as display elements. The status LEDs indicate various connection and com­
munication states.
X3: LNK, X4: LNK
Colour State Meaning
­­­ No network connection
Green Network connection is error­free
The designation "LNK" stands for "LINK".
X3: TRF, X4: TRF
Colour State Meaning
­­­ No data traffic
Yellow Data traffic is error­free
The designation "TRF" stands for "TRAFFIC".