Installation and Maintenance
5.8 Maintenance
SIMATIC NET PROFIBUS, Optical Link Module
Operating Instructions, 07/2008, A2B00065774O, Edition V1.5
41
¾ 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.
5.9 Cleaning
If it becomes necessary to clean the device, this must be done with a dry, lint-free
cloth. Do not use water or solvent! If liquids get into the device, it must be
deactivated.
When cleaning the device, make sure that no dirt enters the optical transmission
path or gets onto the optical components. This means either that the fiber-optic
cables remain connected or you fit the supplied protective caps!
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