Fiber optic connections
The different control unit types have a different number of fiber optic connections.
No. of fiber optic connectionsType
2 (V1…V2)UCU-22
8 (V1…V8)UCU-23
14 (V1…V14)UCU-24
20 (V1…V20)UCU-25
26 (V1…V26)UCU-26
The maximum length of the cables with 1 mm plastic optical fiber cable is 35 m (115 ft).
Make sure that:
• both cables in a fiber optic pair have the same length, and
• each fiber optic pair connected to one control unit has the same length.
With long distances, cables of different lengths cause different delays, which can have
an unwanted effect on the operation.
For instructions on how to connect the control unit to the converter module(s), refer
to the applicable hardware manual.
10 Operation principle and hardware description
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