Description of the device
2.5 LED display
Optical link module
14 Operating Instructions, 01/2020, C79000-G8976-C270-06
Red Flashing Transmission rate not yet detected because:
• There is no transmitting bus node
• There is no connection to a partner module that is trans-
mitting frames
• Send and receive FO cable swapped over
• Transmission rate does not correspond to the PROFIBUS
standard
• There is only one single active bus node connected that
is only transmitting tokens to itself. After activating a sec-
ond bus node, the display must change (token frames
alone are not enough to set the transmission rate).
• The connected RS-485 segment is only terminated at one
end
• No connection to the master
– FO cable interrupted
– Problem on the RS-485 interface (bus short-circuit)
Does not signal
Red/green Flashing Transmission rate detected but:
• The slot time of the network could not yet be detected
(network parameter HSA set too low, there is no transmit-
ting bus node)
• One optical channel is set to the "redundant optical ring"
mode but the second one is not (this mode must always
be set on both optical channels)
• The slot time of the network is set too low
Does not signal
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