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Connecting the operating power supply
Image 5-3
1. Supply the PROFIBUS OBT only with a stabilized safety extra-low voltage complying with
IEC 950 / EN 60 950/VDE 0805 of nominally 24 V (minimum 19.2 V and maximum 28.8
V). The power source must meet the requirements of NEC Class 2 according to the
UL/CSA approval.
2. If the PROFIBUS OBT is not mounted on a grounded DIN rail, run a grounding cable with
a cross-section of 2.5 mm
as short as possible.
PROFIBUS Optical Bus Terminal (OBT)
Operating Instructions, 04/2016, C79000-G8976-C122-07
Pin assignment of the 3-pin terminal block – grounding terminal ↓ and power supply M,
L+
from the terminal
2
to the nearest ground keeping the cable
Commissioning
5.2 Installation
23
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