Configuring a T/C on Foxboro PAC T2550

Hi there,
Currently i'm facing a problem configuring a Type K Thermocouple to my T2550. i'm using T/C type AI 4 Channel card on my T2550. when i connect the T/C to my T2550 the is no reading at all either at AI or PV . i've set the HR & LR accordingly but when i connect the thermocouple to the chart recorder the reading is appear as normal.
Please advice me if there is any configuration or setting that i need to carried out at my T2550. if you have sample then it would be more helpful.

Thanks
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  • Bryan (Customer Support Engineer) March 14, 2013 12:03
    Have you configured the AI_UIO block for the AI4 input channel as you need?
    Have you downloaded and started the database to take the configuration?
    Once loaded you should be able to open the database and using online connect to view the AI_UIO block and check the values being seen.
    You can confirm you are online by checking for the circled plus watermark, which is usually feint but the Online Connect button will be depressed. You can also check by looking at the header block for the clock changing.

    See the attached image. To get a value in the AI_UIO block I just shorted the inputs for channel 1. Set the InType to TC and the Character Type to K, before downloading.

    You should also check the Terminal Unit of the AI4 has a "AI4-TC" sticker.

    • This comment was removed on 2013-03-14.
      see the change log
    • Hi Bryan,
      Thanks for the info. yes i already configure the module correctly as per attachment that you attached including viewing it online. The terminal block card that i used is also AI4- TC and yet there is still no value of AI. tomorrow i will try to swap the terminal unit and hopefully there some improvement. i will update you once i get the solution.

      Anyway is there any news regarding the quarantined T940? i'm planned to proposed it for our existing install based upgrade

      Thanks.
      Hafiz
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  • Ian Roughsedge (Product Manager - Systems) March 15, 2013 08:26
    Hi Hafiz,

    Please:

    1) Check the 'Status' field in the AI_UIO block, in Bryan's example above it is zero (>0000) indicating all is well with the hardware, If it is non-zero, then look at the detail bits to disciver the problems. Note that in the LINdatabase a field value with a leading '>' indicates that a hexadecimal number follows.

    2) Check the PV. Is the PV in range, above range, below range? If the system has detected a problem with the input then the PV will be driven according to the setting of field PVErrAct (PV Error Action). In Bryan's example picture above we see that PVErrAct = UP and so if there was an error in the hardware we would expect to see a PV way above high range (i.e. PV > HR and so Out of Range).

    3) Check the alarms. Make sure you have set a non-zero priority for all the non-process alarms (Hardware, OutRange, PVError, CharErr and ModBlock), a non-zero setting means they are enabled. Are any of those raised to indicate a problem?

    4) Check especially the Alarm called ModBlock. I notice you are a T940 user, are you perhaps new to the AI_UIO block and T2550/T2750? If so, you need to be aware that you must not only cerate the AI_UIO block but also the MOD_UIO block too (Module Block to represent the I/O card on the rack). If you use the I/O Branch of the LINtools document contents view soset up the I/O then creation of MOD_UIO block instances will happen automatically.

    5) I know you mentioned that AI was not updating so it looks like a hardware problem, but checking the field called Mode is in 'Auto' is a useful check too. Settings other than Auto can decouple PV from the hardware (e.g. to provide override of PV at test time or in the event of a device failure in the field).

    6) Can you advise which site (slot) and channel you are using and advise which terminals you are connected to e.g. send a picture of the wiring.
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