Siemens SIMATIC NET PROFIBUS Instruções de Operação descarregar pdf (Página 49)

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

5.7.2 Troubleshooting

This section will help you to localize the problem after an error message (LED or signaling

contact). Refer to the description of the LED displays in section 5.7.1.

5.7.2.1 Error display of the System LED

See description of the LED displays in section 5.7.1.

5.7.2.2 Error display on CH1 / CH0

Check whether

 the DIL switch S0 (CH1) or S8 (CH0) is in position 1, when the OLM is in the electrical

star segment of a star topology (see section 3.2)

 the probl

em remains after removing the RS-485 connector.

Still there: Device defective

. Change the OLM.

Gone: The error is in the RS-485 bus segment.

Check:

– all RS-485 connectors as described in section 5.3

– the setu

p and the shielding of the RS-485 bus segment.

– the RS-485 bus segment using the PROFIBUS bus monitor

– the configuration of all bus nodes.

5.7.2.3 Error display on CH2 / CH3

1. Check whether

 only modules of the same type are connected to each other optically (see chapter 3),

 the optic

al fiber is permitted for the module type being used and does not exceed the

permitted length (see

Table 2-1).

 the optical channels connected via fiber-optic cables are set to the same mode. (see

section 4.2.3)

 the end

s of the fiber-optic cables and the optical transmission and receiving components

are clean

 the fiber-optic cable connectors are connected completely and correctly,

 the requirements of section 5.1.2 were met when connecting an

d laying the optical bus

cables.

Does not apply if the monomaster of a PROFIBUS network is connected to the RS-485 bus segment to be tested. In this case, swap the

suspect OLM with another OLM from the network and then carry out the test mentioned above.

If the error moves with the OLM, the device is defective. Replace the OLM.

If the error does not move with the OLM, the disturbance originates in the RS-485 bus segment. Take measures as described above.

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