Host Engineering Forum

General Category => Do-more CPUs and Do-more Designer Software => Topic started by: Rastus81 on April 22, 2013, 11:51:32 PM

Title: Do More thermocouple
Post by: Rastus81 on April 22, 2013, 11:51:32 PM

Hello All,

Can anyone point me in the right direction with a F2-04THM.
I have a thermocouple connected to CH1, but WX0 is reading 0.

The manual doesn't cover domore plc's.

Thanks
Rastus

Title: Re: Do More thermocouple
Post by: franji1 on April 23, 2013, 01:07:10 AM

See if there are any details you need in the Do-more manual

Here's the link to chapter 6:
http://www.automationdirect.com/static/manuals/h2dmm/ch6.pdf

and a link to a page containing links to all the chapters:
http://www.automationdirect.com/pn/doc/manual/h2-dm1e

Title: Re: Do More thermocouple
Post by: Rastus81 on April 23, 2013, 01:14:19 AM

Thanks,

I have that manual. But it only outlines the jumper settings. Im wondering if i need to use any instructions to read the data, like they outline in the module manual.
http://www.automationdirect.com/static/manuals/d2anlg/ch7.pdf

Title: Re: Do More thermocouple
Post by: franji1 on April 23, 2013, 09:08:13 AM

I'm not a thermo-couple person, so I don't know how/if the wiring can cause what you are seeing.

Title: Re: Do More thermocouple
Post by: BobO on April 23, 2013, 09:14:59 AM

The short answer is no. If the module is wired correctly and working correctly the data should just show up in WX memory.

Title: Re: Do More thermocouple
Post by: plcnut on April 23, 2013, 09:45:40 AM

Double check the wiring, and make sure the PLC is in Run mode. (I don't want to admit how many times I've had problems, and it was because I was in program mode  :o )
Also Is the PLC seeing the module in the configuration menu?

Title: Re: Do More thermocouple
Post by: MikeS on April 23, 2013, 03:13:34 PM

that module also requires an external 24V connection, make sure it's securely attached, and that the polarity is correct.

Title: Re: Do More thermocouple
Post by: Rastus81 on April 23, 2013, 08:30:45 PM

Thankyou for your replies.

I tried a new thermocouple and the WX register produced a reading.

Although the original thermocouple worked ok in my meter. Maybe i didn't have it secured well enough under the terminal screw.

I wonder if there is an input for open circuit detection?

Thanks again.
Rastus

Title: Re: Do More thermocouple
Post by: plcnut on April 23, 2013, 09:11:44 PM

It will be Xn. See page 6-27 of the manual.