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I bought LOGO 12/24RC PLC from SIEMENS, and I didn't try it yet because I am worry about the required voltage needed to switch it on. I tried to see the data sheet but I confused with lots of data. If any one has any idea I will be thankful. Here is the data sheet for LOGO 12/24RC

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    \$\begingroup\$ I hate to say it, but if you can't figure out what power is needed you will probably have a hard time doing anything else. Also plc programming is only remotely on-topic here. But for us to help, we will need you to provide us with more info, like links to the datasheet. \$\endgroup\$ – Kellenjb Dec 26 '11 at 6:22
  • \$\begingroup\$ @Kellenjb: Thanks for the respones, I put the data sheet link. Where you suggest the suitable place of my question? \$\endgroup\$ – Adban Dec 26 '11 at 7:45
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    \$\begingroup\$ Read Appendix A. Permissable Voltage Range. \$\endgroup\$ – Majenko Dec 26 '11 at 9:35
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In Appendix A of the data sheet you have all the information you need:

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So you can run the LOGO 12/24 from anything between 10.8V and 28.8V

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