Thermcouple module on SLC 504

Cryogen · Oct 20, 2005

Hi guys, How do I configure T/C modules on SLC 500 (I mean to get the right temperature display). I have three NT8 modules with me.

I have this manual with me (attached) but I do not understand the part where they explain the ladder programming.
Any help would be greatly appreciated..
Thanks

Cryogen · Oct 20, 2005

Sorry the manual is too big to attach.. Let me see if I can post the link..

mgvol · Oct 20, 2005

If your version of RSLogix500 is not more than a couple of years old, you should be able to configure using a wizard instead of in the ladder logic. In the I/O Configuration, highlight the NT8 module and click on the Adv Config button. On the pop-up, click the Configure button and see if a wizard pops up with tabs for each module channel.

Cryogen · Oct 21, 2005

Thanks mgvol

I have Ver 5.50 of RSlogix500 .. It doesn't have the 'configure' option for Thermocouples. WHat is the current version anyway?

mgvol · Oct 21, 2005

Current version is 7.0 and current RSLinx is 2.50. Both of these support the new MicroLogix 1100.

mgvol · Oct 21, 2005

Which part of the ladder example is giving you trouble, the configuration code?

Cryogen · Oct 21, 2005

Please refer my attachment..

I don't understand how the module can be configured as an Output.. Why is the TC module in Slot3 referred to as #O:3.0

The manual is:

Publication 1746-UM007C-EN-P - July 2004

mgvol · Oct 21, 2005

True, it is an input module, but the module configuration data is written to the corresponding output file in the data table. Think of it like this: you are INPUTTING data from the card and OUPUTTING configuration info. to the card.

Cryogen · Oct 21, 2005

Alright, so it is done this way to output the configuration file to the TC module. Now, how will we display temperatures.. Will that be I:3.0 ?

Also, the manual talks about verifying the configuration file by comparing I:3.6 to O:3.2.. I don't get that..

Thanks for your reply

mgvol · Oct 21, 2005

1) Yes, the actuall channel data will be on I:X.0, I:X.1, etc.
2) I believe they are referring to checking the configuration if you are writing logic to change the module config on the fly; if you wnat to monitor the CJC sensor temperature on one of the module channels periodically to monitor the temperature inside your enclosure, for example. I have never done this, I ususally just copy the config data from a static integer file on the first pass of the program and never do it again.

Alan Case · Oct 21, 2005

At a guess (without reading the manual. RTFM) i would say that I:3.0 is a readback of a valid configuration output ie O:3.2
ie if you dont configure the card to valid values the card will not return a valid readback of the config data. Just a bit of self checking built in. Regards Alan Case

Cryogen · Oct 21, 2005

Thanks guys.. I am clear now..

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Thermcouple module on SLC 504

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