Compact logix 5069-IY4 input module - thermocouple

[Cnetwork]

Hello Guys,


Trying to scale a thermocouple directly into my IY4 card. Connected into the terminal +\-.

I’ve scaled the range of my J type to -50 - 750 degrees c for 0 - 100%. I’m getting an abnormal reading. Does anyone know if I need a link on CJC terminals? Or will it be okay just directly into the input?


Thanks

 

[MikeyN]

Which terminal block are you using? The manual says you need a 5069-RTB14CJC if you are using a thermocouple. Use the 5069-RTB18 if you aren't using a TC.

 

[Cnetwork]

Thanks for the reply.

Yeah I read that but been told there’s a way of setting it up with out the CJC terminal block. I’m using the standard 18tb screw

 

[MikeyN]

Terminals 0-1 and 11-12 do not indicate a use in the manual. I bring this up because the manual does say on the top of page 69 that the IY4 has 2 CJC sensors. 2 thermistors embedded in the 14CJC or 2 thermistors wired to the 18. They even indicate the thermistor type as a Measurement Specialties, Inc. 10K3A1A.

The only place on the TB I could see to connect remote CJC would be on the terminals I listed above. The FBD on page 66 indicates that thermistors could be connected to terminals CJC x- and CJC x- [sic]. My guess is that those were meant to be the unlabeled terminals, but Rockwell never got that implemented and missed updating this part in the manual.

I think your easiest route is going to be to purchase the correct RTB. If you do happen to make it work with that RTB, please let us know!

 

[danw]

Note that in the module configuration, logic 1 disables the CJ measurement.