Siemens SIMATIC NET PROFIBUS Provozní pokyny Strana 421

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5.1 LED Indicators
25
5 LED Indicators and Troubleshooting
Version 1.0 8/00
5 LED Indicators and Troubleshooting
Fig. 14: LED indicators on the front plate
CH 1
System
PROFIBUS OLM
CH 2
CH 3
GND
Receive
Signal
Intensity
CH 2 CH 3
LED indicators
Possible causes
The transmission rate has been recognized and the power supply is in order
Power supply has failed (total failure*)
Power supply connected incorrectly
Module defective
Transmission rate has not yet been recognized
No transmitting bus subscriber present
No connection to a partner module sending frames
Send and receive optical fibers have been transposed
Transmission rate does not correspond to the PROFIBUS standard
Only one active bus subscriber is connected, which is only sending tokens to
itself. The indicator must switch over after a second bus subscriber has been
activated (token frames on their own are not enough to set the transfer rate).
The connected RS 485 segment is only terminated at one end.
Transmission rate recognized but
the network slot time could not be determined (network parameter HSA is set
too low, no transmitting bus subscriber present)
one optical port is set to Redundant optical ring mode, but not the second
(this operating mode must always be set at both optical ports)
the slot time of the network configuration is too short
* failure of both power supply sources with redundant infeed
LED Indicator
System
lights green
not lit
flashes red
flashes red /green
Signaling contact
no signal
signal
no signal
no signal
5.1 LED Indicators
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