206 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
Ethernet Switch indicators
Table 35 – LED Indications on Ethernet Switch
XMT (upper LED)
LINK (lower LED)
Green (On/Off)
Green (On/Off)
On while a message is being sent from the Main CPU;
otherwise Off.
On while the Main CPU is receiving a message.
Remains On as long as host is present; Off when the
host is removed from the link.
Link / Yellow
Speed / Green
On while the as long as electrical connection host is
detected; Flashes during message transactions.
OFF for 10Base-T connections
ON for 100 Base-TX connections
NOTE: These LEDs indicate activity on the communication port, they are
controlled by hardware (PHY chip), not by software.