190 HC900 Process & Safety Controller User and Installation Manual Revision 6
21 April 2017
Ethernet Switch indicators
Table 33 – LED Indications on Ethernet Switch
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.
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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