Dimitri Krut

This is what I basically expected. Being new to this, I was hoping that there is some primitive command or function capable of handling this. Long press button features are very common and it would be nice to have it precoded. Thanks, D.

I am trying to implement a long button press (>1 sec) to reset a counter or a clock that otherwise need to keep running Can someone point to an example or offer an idea? Thanks!

Finally tried it last week and it does work now. Thank you for your help!

Trying to connect to Samba SM70 using Unitronic Remote Access 9.8.10. I am communicating directly using USB (RS232 emulation). Remote Access finds the PLC and communicates with no issues. When I try to click OnLine icon, I immediately get Run-time error "5" Invalid Procedure or argument. Any advice on how to deal with this error? Thanks!

We are trying to replicate our current capability. Users hold UP or DOWN buttons to move and no movement when neither button is pushed. This would be a tri-state switch. I can see that it can be implemented using "Image by Range" button capability. I would rather just draw two buttons with the relay logic to make sure that two of them are not pressed simultaneously. Your description of the motor phase reversal is exactly how this one operates. I need to use relays (contractors) anyway... so I will use a three line reversing contractor. Thanks for your help!

Thanks for the code. This exactly what is needed. We are modernizing a large optical illumination tool that contains the elevator mechanism. This tool was originally designed in 1962 and went only through minor changes in late 1970s. Currently this elevator mechanism runs with triple pole relays setup for polarity reversal, limit switches and also with complex push buttons (up/down). It uses a single phase geared motor used for very slow up/down movements. Only uses 3A 115AC. One option is to maintain the basic relay arrangement and just use PLC to replace up/down buttons. The other approach is to feed the limit switches and everything else into the PLC and use it to energize relays in a proper order. You are right about polarity reversing contactors. This is probably the cleanest way approaching it. Thanks again for the PLC code!

I am sure this topic has been addresses before, but I was not able to find references by searching and there were no similar examples/tutorials. Perhaps someone can point me to a prior discussion or an example. I need to control a geared AC motor for up and down motion of a small lift to two end point switches (top & bottom). If I use polarity reversing relays, I need to make sure that both up and down (HMI) buttons are not pressed at the same time. Questions: What's the best way to implement a tri state switch -- up, down and neutral or do a lockout of the unused button? Should I do polarity reversal in the PLC or wire up two double pole relays (the old fashioned way)? Thanks!

I got it working with MI. Thanks for the ideas.

My application needs for the user to enter the desired current in power supply. Typically it will be 90 to 110Amps. It is desirable to enter with the precision of 0.1 Amp. One possibility I am considering is using MI w/o decimals and then using up/down buttons to adjust to the tenths decimal value. Still not sure how to handle that. Thanks!

Using Samba SM70J Trying to make sure that the floating lumber entry is limited to a certain value range and limit a number of characters after the decimal point to one. for example 123.4 is allowed, but if the user tries to enter 123.44, it will be rounded to 123.4. MF type variable does not seem to allow masking of variables. Is there a work around this? Thanks!

Using Samba SM-70 Need to have users enter a single precision floating, masked to enter no more then three digits before decimal and one after. MF type system variable does not permit for masking. Any way to make sure the user will enter masked numbers? Thanks!