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Honeywell 900U02-0100 - Table 35 - LED Indications on Ethernet Switch

Honeywell 900U02-0100
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206 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
Ethernet Switch indicators
Table 35 LED Indications on Ethernet Switch
LED
LED State/Color
Description
10/100 Base-T port
Legacy
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.
New Systems
Upper LED
Lower LED
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.

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