Showing results 1 to 2 of 2

Thread: Status: INVALID , NT_870 but reading values

  1. #1
    Join Date
    17.06.2013
    Posts
    11

    Default Status: INVALID , NT_870 but reading values

    Hi all
    I have one substation with SIPROTEC4 and thiese SIPROTECS are connected to AK-1703 and I am reading values from AK-1703 with AK-driver. All the variables are ok without currents, they have status : INVALID,COT0,COT1,NT_870 but i can read the values and they are changing all the time(and this is not for all devices, most of them are ok ), so the are not like usual INVALID status 0 or last valid value.
    What coud be the reason for this?

    Best regards!
    Angel Markov

  2. #2
    Join Date
    01.07.2008
    Location
    Salzburg, AT
    Posts
    1,039

    Default Re: Status: INVALID , NT_870 but reading values

    in IEC60870 protocol there are defined special flags like 'not topical' and 'invalid'. Using These flags the Slave can inform the Master (e.g. SCADA) that the end-device (Hardware connected to the Slave) does not deliver the data anymore or delivers data of some reasons not reliable.

    So obviously the data is coming from the Slave marked as 'not topical' and/or 'invalid'. The reasons you have to check in the end-devices and/or in slave.

Similar Threads

  1. Reading 64-bit registers via Modbus
    By shikra in forum Drivers
    Replies: 4
    Last Post: 19th November 2013, 11:59
  2. Reading Excel
    By navaneet in forum Engineering Studio & Service Engine (former zenon Editor & Runtime)
    Replies: 1
    Last Post: 27th September 2013, 17:09
  3. dynamic limits + invalid bit indication as text color
    By stolyarov_as in forum Engineering Studio & Service Engine (former zenon Editor & Runtime)
    Replies: 9
    Last Post: 24th July 2012, 09:52
  4. Invalid time stamp
    By jaroslav_kral in forum Engineering Studio & Service Engine (former zenon Editor & Runtime)
    Replies: 2
    Last Post: 27th February 2012, 12:49
  5. Replies: 2
    Last Post: 29th March 2011, 10:46

Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •