Operating instructions

Active Components and Topologies
6-4
SIMATIC NET Tw isted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Note
Since the beginning of 1998, the Optical Link Module (OLM) is supplied as version
2.0. Version 2.0 includes the following improvements compared with the previous
version:
-- Redundancy control is not dependent on the load distribution in the network
-- The diagnostic LEDs also indicate the segmentation of a port; this changed the
display patterns of the link status LEDs (LS LEDs)
-- The signal contact also indicates the segmentation of a port
The differences are explained in detail in the relevant sections in this manual.
Both versions are fully compatible and can be installed in a system in any
combination.
The OLM version can be found on the type plate on the right-hand side panel (see
Figure 6-3)
SIMATIC NET
OLM f. Industrial Ethernet
6GK1102-4AA00
DIL Switch Settings:
Port1..Port5
LA1 ... LA5 Link Alarm
Disabled
Enabled
0
1
Port 5
SIMATIC NET
Industrial Ethernet OLM
Version 2.0
6GK1102-4AA00
DIL Switch Settings:
Port1..Port5
LA1 ... LA5 Link Alarm
Disabled
Enabled
0
1
Port 5
OLM Version 1
OLM Version 2
Figure 6-3 Type Plates of OLM Version 1 and Version 2.0
!
Warning
The OLM/ELM devices are designed for operation with safety extra-low voltage
(SELV). This means that only safety extra-low voltages (SEL V) complying with IEC
950/EN 60950/VDE 0805 may be connected to the power supply terminals and the
signal contact.