Siemens SIMATIC NET PROFIBUS manual Displays

Infrared Link Modul (ILM) 6ZB530–3AC30–0BA1

9	Displays
POWER
green LED		not lit	No power supply or internal power supply defective or ribbon ca-
			ble not plugged in.
		lit green	Power supply OK
TX
yellow/orange LED		not lit	Data not sent optically
		lit yellow	Data are sent, acknowledgment bit correctly received or acknow-
			ledgment bit mechanism not activated.
		lit orange	Data being sent, acknowledgment bit activated but not correctly
			received.
RX
yellow LED		not lit	Data not optically received
		lit yellow	Data optically received
LOW
red LED		not lit	Receive level OK (RX LED lit)
			no receive level (RX LED also not lit)
		lit red	Data optically received, the level is however low (RX LED also lit)
			risk of data errors
ERROR
red LED		not lit	Infrared level at receiver is not critical
		lit red	Infrared level at receiver is critical, risk of data errors

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