Can somebody please help me out with ladder programing?(Weg Ladder Programmer) - Page 1
Forum section: electronics / beginners

author: Hadband
author_rank: Newbie
timestamp: March 14, 2022, 08:27:29 pm
content: I'm really new in the plc world, I've read about the ladder logic and how it works, but still there are a lot of questions, I'm working with a weg PLC (SCA06) wich is used mostly to control the servo motor wich is used for the spindle in a CNC machine, we used to turn the spindle on and adjusting the velocity using the parameters, wich can be modified direct at the plc. Therefore I was asked to program buttons so we wouldn't need to interect directly with the plc. I couldn't connect with the newer software they dispose in their website so I had to stick with the old one for the program. Down here I'm going to post some prints of the current sheet and further in the text I will be explanning more about what I already did.We have 3 Digital inputs where all of them must be push buttons, one must be for turning on and off(Digital input 1), and 2 of them to turn the velocity up(digital input 2) and down(digital input 3). For the turning on and off I think it should work just fine with the power block, and for the velocity wich is the problem I came ask for help I was trying to use some action blocks(MC_MoveVelocity) and the high and low signal specified in the use . I'm really in doubt how this should work, if the program shold just recognize the low state from the ladder logic as an deceleration or I should send an low state in the digital input, so if anyone have a clue or at lest an idea of how I can solve my problem I will be really gratefull.If anyone have any suggestions or more questions about the program I will be here to awnser them.

author: CaptDon
author_rank: Super Contributor
timestamp: March 15, 2022, 12:14:46 am
content: Some of the ladder logic software out there can be ported to almost any device, Fanuc, Slick, Allen Bradley Etc. Maybe you could find some other ladder logic software that would give you the options you like and use and would also compile and port to your machine/device?There are a lot of 'hobbyist' CNC folks around now, perhaps they have some forums you could track down?

author: xue
author_rank: Newbie
timestamp: March 15, 2022, 02:30:10 am
content: You have no idea what you are doing, arent you...Show me available timer blocks and ill try to draw that on a piece of paper, it has been a few years since i had my hands on PLC but ill try my best.

author: xue
author_rank: Newbie
timestamp: March 15, 2022, 03:29:32 am
content: Jesus i hate the paywall that is required to use any of this ladder softwareanyway, as they are push buttons you will need to compensate for a "wiggle" that you can achieve with a timer. About the block, look into documentation:https://www.eevblog.com/forum/beginners/can-somebody-please-help-me-out-with-ladder-programing(weg-ladder-programmer)I dont know what are you working on, but that input parameter only referes to a max value, could you say something more about your project.

author: ndzied1
author_rank: Contributor
timestamp: May 31, 2022, 01:30:04 pm
content: A bit after the fact but perhaps someone searching in the future will find this helpful.One of the best resources for PLC related (and general industrial controls) questions is at:http://www.plctalk.net/qanda/