Siemens SIMATIC NET PROFIBUS Instructions d'exploitation télécharger pdf (Page 47)

Installation and Maintenance

5.7 LED Displays and Troubleshooting

SIMATIC NET PROFIBUS Optical Link Module OLM V4.0

Operating Instructions, 01/2013, C79000-G8976-C270-03

LED display Possible causes Signaling

contact

 lit green - The transmission rate was detected and the voltage supply is ok does not signal

 not lit - Voltage supply outage (complete outage, with a redundant supply, outage

down of both supply voltages)

- Voltage supply connected wrongly

- Module defective

signals

 flashes red Transmission rate not yet detected

- There is no transmitting bus node

- No connection to a partner module sending frames

- Transmit and receive fiber-optic cables are swapped over

- Transmission rate does not correspond to the PROFIBUS standard

- Only one single bus node is connected, which only sends token to itself. After

activation of a second bus node, the display must change (token frames are

not enough to set the transmission rate)

- The connected RS-485 segment is only terminated at one side

does not signal

System

  flashes

red/green

Transmission rate detected but

- The slot time of the network could not be detected yet (network parameter

HSA set too low, there is no transmitting bus node)

- One optical channel is set to “redundant optical ring“ mode but the second

one is not (this mode must always be set on both optical channels)

- The value for the slot time of the network is set too low

does not signal

 lit yellow Signals are received on the RS-485 bus lines. does not signal CH1, CH0

electrical

 not lit Bus node is not connected, does not signal

-Connected bus node is not turned on

- Interruption

of one or both cores of the RS-485 bus line

- Short circuit

or ground fault of cores of the RS-485 bus line

does not signal

 flashes red/lit red Sporadic disturbances because of

- Insufficient shielding of the RS-485 bus cable

- Open bus cable, this means the RS-485 bus cable is only connected at one

end

- RS-485 segment is not terminated or only at one end

- Removal/insertion of an RS-485 bus terminal or terminating plug

Permanent problem because

- Cores A and B of the RS-485 bus cable have been swapped over

- Short circuit

on the RS-485 bus cable

- Transmission time exceeded due to a bus node in a bus segment connected

to channel 1 or 0

-Module and other bus nodes connected over channel 1 or 0, transmit at the

same time (e.g. because of duplicate address assignment or slot time set too

low or when restoring after segmentation in the optical line, see section 3.1.1 )

- RS-48

5 driver of the module defective (e.g. after lightning strike)

signals

does not signal

Mode “Bus with fiber-optic link monitoring” and “redundant optical ring“

CH2, CH3

optical

 lit yellow PROFIBUS frames are received on the optical channel does not signal

Depends on the cable length between RS485 interface and fault, and on baud rate. Can vary from one example to another.

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Siemens SIMATIC NET PROFIBUS Instructions d'exploitation Page 47

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