Logix 5000 question (view32 momentary push buttons)

[Russ]

I wrote (what I thought) was a simple snippet of code in 5000. I gave the tags to someone working up the screens (in rsview32), and they told me that::::

Note: the Control always reverts back to Auto Mode.
When the Manual mode is pressed and held, the feedback is Manual mode. As soon as the Manual push button is released, the control goes to Auto Mode.

Attached is a pic of the code... did I do something wrong, or is there something amiss with the way they've written the rsview32 code?

 

[kjacoby]

I just tested the code on a ML1100 and it works just as you expect.

 

[TConnolly]

I suspect the problem is in the RSView32. Can you post the .gfx file for the offending screen?

I recommend that the RSView32 momentary buttons be configured to execute the tag command on button release, not on button press.

Assuming that the RSView32 buttons are configured as momentary (on release) then it looks like it will work most of the time. I say most of the time because RSView32 momentary buttons sometimes get stuck on. I've found that it is necessary to check momentary HMI buttons for stuck bits and unconditionally unlatch the stuck bit.

Also always remember that memory writes from the HMI are asynchronous to the program scan, that can trip you up in some situations.

 

[Russ]

Thanks guys. I just heard back from the office. The one thing they recommend changing is to replace the 'first scan' bit with a 'one shot' bit.
This processor uses logix 5000 version 16. They said that when they tried updating it to version 19 it didn't work properly. That Allen Bradley advised against using the 'first scan' bit because of erratic behavior.

It's the first time I've heard of this phenomenon. I've replaced the 'first scan' bit with a 'one shot' just to be safe..... but I'm perplexed...

 

[Russ]

Here's the slight modification I made.