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Wiring

5-6

Distributed I/O Device ET 200M

EWA-4NEB780600602-06

Features of Load Power Supplies

The load power supply feeds input and output circuits (load circuits), as well as

sensors and actuators. The characteristic features of load power supplies required

in specific applications are listed in the following table.

Characteristics of the

Load Power Supply

Mandatory for ... Remarks

Safe (electrical) isola-

tion

Modules that have to be

supplied with v60V DC

or v25V AC

The PS 307 power supplies and the

Siemens load power supplies of the

6EP1 series have this feature.

24V DC load circuits

Output voltage toleran-

ces:

20.4 V to 28.8 V

40.8 V to 57.6 V

51 V to 72 V

24V DC load circuits

48V DC load circuits

60V DC load circuits

With high output voltage ripple we re-

commend that you provide a suppor-

ting capacitor. Rating: 200 mF per 1A

load current (in the case of full-wave

rectification).

Rule: Ground Load Circuits

Load circuits should be grounded.

The common reference potential (ground) guarantees full functionality. Provide a

detachable connection to the protective conductor on the load power supply

(terminal L- or M) or on the isolating transformer (Figure 5-1, ). In the event of

power distribution faults, this makes it easier to localize ground faults.

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Siemens SIMATIC Distributed I/O System DP/ASi Link Specifiche Pagina 92