Hi, I'm new in this Logo! and have a project.

I'm going to use Logo! 24RC , and needinput DC surge protection from relay.

so, IthinkMOV is approprite component.

what do you think? any recommendation?

one more subject is power backup. I'd like to put a simple backup circuitso thatt Logo! is always on as long as power is alive.

Is there any simple way? the initial time of Logo! is 8~ 10 sec. this time is too long for this project.

Look at following examples of microautomation

Micro Automation: Fast and safe fault diagnostics for 24-V load circuits (MAS 24)

http://support.automation.siemens.com/WW/view/en/21064023

Other examples

https://www.automation.siemens.com/mcms/programmable-logic-controller/en/logic-module-logo/application-examples/Pages/Default.aspx?HTTPS=REDIR