Siemens SIMATIC NET Instrucciones de operaciones Pagina 274

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Interfaces, Displays and Operator Controls
Industrial Ethernet OSM/ESM
46
C79000-Z8976-C068-04
4.1.7 Signaling Contact/Terminal Block for Attaching the Power Supply
The attachment of the power supply and the signaling contact is made using a 6-pin
plug-in terminal block with a screw locking mechanism.
L1 +
F1
M
M
F2
L2 +
+
24V
+
24V
Figure 22: Terminal Block
Warning
Industrial Ethernet OSMs/ESMs are designed for operation with safety extra-
low voltage. This means that only safety extra-low voltages (SELV) complying
with IEC950/EN60950/ VDE0805 can be connected to the power supply
terminals and the signaling contact.
The power supply unit to supply the OSM/ESM must comply with NEC Class 2
(voltage range 18 - 32 V, current requirement 1 A)
The signaling contact can carry a load of maximum 100 mA (safety extra-low
voltage (SELV), DC 24V).
Power Supply
The power supply can be connected redundantly. Both inputs are isolated. There is no
load distribution. With redundant power supply, the power supply unit with the higher
output voltage supplies the OSM/ESM alone. The power supply voltage is electrically
isolated from the casing.
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