Siemens SIMATIC NET PROFIBUS manual Low Led

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

LED Display		Possible Causes	Signaling
			Contact
POWER LED	lit green	- No acknowledgment pulse received since partner	Signals when
		station not configured with acknowledgment pulse	configured
TX LED	lit orange,	- On point-to-multipoint links on the PROFIBUS	(acknowledg-
			ment pulse)
		ILM of the master subnet if acknowledgment bit
RX LED	lit yellow
		configured (see Section 6.4)
POWER LED	lit green	- No acknowledgment pulse received since partner	Signals if
		station is not configured with acknowledgment
TX LED	lit orange,	pulse or receive level for acknowledgment pulse	configured
		and response frame too low.
RX LED	lit yellow,	- On a point-to-multipoint link on the PROFIBUS	(acknowledg-
			ment pulse,
		ILM on a slave subnet if configured with acknow-
LOW LED	lit red	ledgment bit (see Section 6.4)	level monito-
			ring)
POWER LED	lit green	- Partner station not responding because not atta-	Signals when
		ched, infrared link interrupted, incorrectly configu-	configured
TX LED	lit yellow	red (PROFIBUS address of the slave incorrect,
		data rate of the partner PROFIBUS ILM set incor-	(bus activity)
RX LED	not lit	rectly etc.)
POWER LED	lit green	- Risk of problems on bus, since infrared link has	Signals when
		too much attenuation (obstacles in area of trans-	configured
TX LED	lit yellow,	mission link, distance between PROFIBUS ILMs
		too great, PROFIBUS ILM turned out of line with	(level monito-
RX LED	lit yellow,	partner station)	ring)
LOW LED	lit red
POWER LED	lit green	- Risk of problems on bus due to incidence of ex-	Signals when
		traneous light (for example sunlight, lamps with	configured
TX and RX LEDs not lit		infrared component, halogen lamps with high
		energy)	(constant
ERROR LED	lit red		light)
POWER LED	lit green	- Bus problems must be expected due to incidence	Signals when
		of extraneous light with high-frequency modula-	configured
RX LED	lit yellow	tion (for example energy-saving lamps with HF
		switching device)	(constant
ERROR LED	lit red		light)
Table 1:	Possible problems operating the PROFIBUS ILM

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