...
Signal LED must be available on case. A red blinking LED must blink 3 time in 3 seconds = 1 Hz if signaling is forced over DCP. On NXHX90 this is the COM0 LED.
EthernetIP:
There are no LEDs mandatory, existing LEDs must be named as follows:
“MS”, “Mod”, “Mod Status” or “Module Status”
“NS”, “Net”, “Net Status” or “Network Status”
EtherCAT:
For EtherCAT take the document ETG700. EtherCAT has strong rulse for printing lables on the case and necessary LEDs.
...