Siemens SIMATIC NET PROFIBUS Instruções de Operação descarregar pdf (Página 50)

Installation and Maintenance

5.8 Maintenance

SIMATIC NET PROFIBUS Optical Link Module OLM V4.0

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

2. Detect the optical receive level (section 5.6):

 Check the fiber-optic cable attenuation with an optical level meter if the level is in the

range “function not guaranteed” or “optical link power margin reduced". If the attenuation

is too high, replace the fiber-optic cable. If the attenuation is within the valid range, one of

the two OLMs of the disturbed segment is defective. First, replace the OLM which

supplies the signal for the measurement mentioned above. If the problem remains,

replace the other OLM instead. If there is no optical level meter at hand, you can still get

an idea of where the problem lies simply by swapping over both fiber-optic cables at both

OLMs: if the problem moves along with the cables, the cable is almost certainly faulty, if it

does not, the problem is in one of the OLMs.

 If the level is in the range “normal operation”, first check the transmitting OLM, as

described above, and then the receiving OLM, if necessary.

 If the level of both OLMs of the disturbed fiber-optic cable segments is within the range

“optical link power margin reduced” or “normal operation”, one of the two OLMs of the

disturbed fiber-optic cable segment is defective. In this case replace one OLM of the

disturbed fiber-optic cable segment first. If the error persists, replace the other OLM

instead.

5.7.2.4 Level display lit yellow or red

For active interfaces see previous section 5.7.2.3.

The level display cannot normally be deactivated. If you want to have the (correctly)

displayed red level of an unused optical interface changed to green, a "short circuit" must be

arranged from the transmitter to the receiver of the channel involved using a suitable fiber-

optic cable. At the same time, the monitoring for this channel must be active. This means for

channel 2, the S1 and S2 switches are turned off and for channel 3, the S3 and S4 switches.

The channel display (yellow LED) remains off and the corresponding level LED is green.

5.8 Maintenance

The OLMs V4.0 are maintenance-free. It is also not possible to make any calibrations on the

OLM V4.0. There are no elements whatsoever inside the OLM V4.0 housing that need to be

touched by engineers or users. The only controls are the DIL switches are accessible from

the outside.

The devices have a resettable fuse (PTC). If the fuse trips (all LEDs go off despite correctly

applied power supply), the device should be disconnected from the power supply for

approximately 30 minutes before it can be turned on again.

If solvents or similar chemicals are used in the vicinity, the user should periodically inspect

the visible plastic parts of the OLM V4.0 (DIL switches). If there are any signs of changes,

the OLM V4.0 should be replaced.

If any other fault develops, please send the device to your SIEMENS service center for

repair. Repairs on-site are not possible.

Telefon Fax

Technical Support +49 (0)911 895-7222 +49 (0)911 895-7223

Field Service +49 (0)911 895-7444 +49 (0)911 895-7445

Spare Parts / Repair +49 (0)911 895-7448 +49 (0)911 895-7449

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