3.2 Checking Connections
473
7SD5 Manual
C53000-G1176-C169-1
O p t i c a l F i b r e s
WARNING!
Warning of laser rays!
Non-observance of the following measure can result in death, personal injury or sub-
stantial property damage.
Do not look directly into the fibre-optic elements, not even with optical devices! Laser
Class 3A according to EN 60825-1.
For the protection data communication, refer to the following section.
The transmission via fibre optics is particularly insensitive to electromagnetic interfer-
ence and thus ensures galvanic isolation of the connection. Send and receive connec-
tions are identified with the symbols for Send and for Receive.
The character idle state for the optical fibre interface is „Light off“. If the character idle
state is to be changed, use the operating program DIGSI
®
, as described in the SIPRO-
TEC
®
4 System Description.
3.2.2 Checking the Protection Data Communication
The protection data communication is conducted either directly from device to device
via optical fibres or via communication converters and a communication network or a
dedicated transmission medium.
Optical Fibres,
Directly
WARNING!
Warning of laser rays!
Non-observance of the following measure can result in death, personal injury or sub-
stantial property damage.
Do not look directly into the fibre-optic elements, not even with optical devices! Laser
Class 3A according to EN 60825-1.
The direct optical fibre connection is visually inspected by means of an optical fibre
connector. There is one connection for each direction. The data output of one device
must be connected to the data input of the other device and vice versa. Send and
receive connections are identified with the symbols for Send and for
Receive. Important is the visual check of assignment of the send and receive chan-
nels.
For short distances, laser class 1 is fulfilled if FO5 modules and the recommended
fibres are used. In other cases, the laser output may be higher.
If using more than one device, the connections of all protection data interfaces are
checked according to the topology selected.
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