Siemens EF 837 Series Spécifications Page 26

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Power Supply Section 2 Installation
26 3BSE056248
Power Supply
It is recommended to feed the system components and field equipment from
different power supplies. Example of system components are Controllers,
Communication Modules, Fieldbus Communication Interfaces and Modulebus
Modems, (for instance PM864A, CI854A, CI840A and TB840A). Example of field
equipment is transmitters, actuator as well as the field side of the S800 I/O modules
(terminals on MTU and S800L marked L+ and L-).
The power supplies can also be configured in a redundant configuration using
independent voting units.
Figure 13. Recommended Power Supply Concept
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