Siemens SIMATIC NET CP 243-1 - Electrical requirements

Installation and commissioning 09/02
CP 243-1
22 J31069-D0428-U001-A1-7618
Electrical requirements
The input voltage must always be equal to 24 V DC.
Only apply 24 V DC voltage from power sources that are reliably electrically iso-
lated from 120/230 V AC sources and similar sources of danger. Reliable electrical
isolation is defined, for example, in the following standards:
− PELV in accordance with EN60204-1
− Class 2 or circuit with limited voltage/current in accordance with UL 508
The supply voltage on the S7-200 backplane bus is supplied by the respective
S7-200 CPU.
Ensure that the CP 243-1 is properly grounded.