Siemens ESM, OSM technical specifications Terminal Block for the Power Supply and Signaling Contact

Interfaces, Displays and Operator Controls

4.1.7Signaling 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 24: Terminal Block for the Power Supply and Signaling Contact

!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).

Exceptions:

•Supply by PELV (corresponding to VDE 0100-410) is also permitted if the generated nominal voltage does not exceed the voltage limits 25 V a.c. or 60 V d.c.

•Supply by a SELV current source (corresponding to IEC 60950) or PELV current source (corresponding to VDE 0100-410) power limitation is also permitted as long as suitable fire protection measures are taken as follows:

-Installation in a cubicle

-Installation in a suitable enclosure

-Installation in a suitably equipped room.

50	Industrial Ethernet OSM/ESM
	C79000-Z8976-C068-10