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Commissioning
6.2 Installation
Connecting the operating power supply
Figure 6-3
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
short as possible.
Connecting the optical bus cables
Figure 6-4
28
CH2
CH3
M
NEC CLASS2
24V , 180mA
Pin assignment of the 3-pin terminal block – grounding terminal ↓ and power supply M, L+
2
CH2
NEC CLASS2
24V , 180mA
View of the module from the side with the optical channels CH2 and CH3
L+
from the terminal
to the nearest ground keeping the cable as
CH3
M
L+
Operating Instructions, 06/2022, C79000-G8976-C122-08
PROFIBUS Optical Bus Terminal (OBT)
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