Posted 31 Dec 2017 I am currently finishing my A.S. in Engineering Technology. My Capstone course is to wire up a complete S7-1200 system using a 1214C DC/DC/DC CPU. There have been no courses that have explained exactly how they are wired. Only programming, which I am pretty good with. There is a 120VAC to 24VDC power supply. They want it to be wired to switches and lights for a simulator. I am just not sure exactly how the I/O's are wired. Is is sinked or sourced? As far as I know, one sends the ground to the output, and one sends the 24v to the output. I would love to speak with someone on how to wire this, as once I graduate, this is what I want to be doing, but I am stuck in a hard place as none of my classes taught us how to wire the PLC's and even worse, the programming class was all about AB PLC's. I have not learned about Siemen's at all. They should be pretty close to the same, but I know there has to be some differences. Also, how they have it set up, there are 2 power supplies on the plastic panel just to the left of the picture. This seems to me as this is a sinking I/O. Am i off? Share this post Link to post Share on other sites
Posted 31 Dec 2017 (edited) Hello, the Photo is a little bit dark, I can't read the marking. anyway Please try to check the attached picture, it might help you. Edited 31 Dec 2017 by Jairus 1 person likes this Share this post Link to post Share on other sites
Posted 5 Jan 2018 So the l1 is going to be the input from the power supply, correct? since the supply is a 120vac in/24vdc out, i would run the 24v to the input of the cpu since it is the dc/dc/dc model. Then the #4 is going to run the power to my PB's or toggles, and then back to my inputs so when the switch is pressed, it will activate that input. am i on the right track? Then the outputs, im not sure what exactly i need to do. power to the 1 &6, which leaves 6 lights all wired to a neutral? Share this post Link to post Share on other sites
Posted 18 Jan 2018 On 1/5/2018 at 0:29 AM, Allen82686 said: So the l1 is going to be the input from the power supply, correct? since the supply is a 120vac in/24vdc out, i would run the 24v to the input of the cpu since it is the dc/dc/dc model. Then the #4 is going to run the power to my PB's or toggles, and then back to my inputs so when the switch is pressed, it will activate that input. am i on the right track? Then the outputs, im not sure what exactly i need to do. power to the 1 &6, which leaves 6 lights all wired to a neutral? Hi Allen, Yes, your CPU is taking 24VDC as incoming power supply. Jairus's photo is another CPU modal. https://www.sahkonumerot.fi/2702074/doc/technicalinfodoc/ CPU1214C.pdf Share this post Link to post Share on other sites