CompactLogix L35E Serial Port

[brassard]

I need to change the configuration of the serial port of a CompactLogix L35E. Every time I try, I receive the error "Invalide attribute value" and the the parameters go back to the default value.

The serial port is not used, and a PV1000 is networked by Ethernet.

But, when I'm using the spare PLC and do the same thing at the office (without the PV), I've no dificulty to change the serial port configuration.

On the field, I've try different way to change it but no result.

Any ideas?

 

[TWControls]

Are there any message instructions in the program that could possibly be servicing the serial port even though nothing is hooked to it?

What version of RsLogix are you using?

Your doing this in run mode correct? You can't shut the processor down right?

----------------------------------
TW Controls -

http://www.twcontrols.com

 

[brassard]

I'll have to check out for the original program, but yes for the modified program, since I send out string of ASCII thru the serial port.

I've put back the original program (the one that didn't send code thru serial port)and try to change the config, but it didn't work. The key was in remote mode, and I've put the PLC in program mode

I've RSLogix V13.04 and firmware support V10 to V15.

Like I've mentionned before, using the same code in the spare PLC (without PV1000) and I'm able to change the port config with no problem (online and run mode, offline and download).

Yes, I can shutdown the processor.

 

[TWControls]

What triggers the MSG instruction. It is in the buffer. I don't think you can change the settings while there are outgoing messages but haven't tested to be sure.

Is it possible that the message is not being enable when you are using your spare because an input is not made or a tag in the Panelview is not on?

----------------------------------
TW Controls -

http://www.twcontrols.com

 

[TWControls]

Sorry, but I just tried it with MSG instructions and AWTs going out of the serial port. That doesn't appear to be the problem. Would be curious whether you could change it or not in program mode but you would have to shut down the machine to do that. Would have to see code to give anymore ideas

----------------------------------
TW Controls -

http://www.twcontrols.com

 

[brassard]

I'll have to take a look at the original program to make sure that no instruction try to use the serial port.

And also, just to be sure, next time I'll be on site, I'll disconnect the PV even if it is on the Ethernet port.

Any idea about the error "Invalid attribute value"? This is the one that causes all my problem, it happen every time I apply the new setting.

 

[brassard]

Hi everybody,

Thank a lot for your suggestion, but it was more tricky than it looks.

Like mention in the first post, there was an error "Invalid attribute value" each time I download the serial configuration. There was no information with this error.

Tech support group from RS I've no clue about my problem, but they told me to try the following thing and it worked.

-Export the program in .L5K and reimport it in .ACD.

So, when I've reimported it, I've received the following warning:

Warning: Line 6767: An error occurred while setting attribute TOKENHOLDFACTOR of DF1 DF1 (Value too small.)
Complete - 0 error(s), 1 warning(s)

It make sense, since this attribute is related to the serial port.

Finally, I've download this program (doing nothing for the warning) and now I can change the serial port configuration (online) like I want.

Thanks again!