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If you're getting a -1 in MI 282 then something is happening.  The block just doesn't know what to do with the incoming stream. If you're using Ethernet then COM 1 will be dedicated to your SCAN block. DanT describes using Info Mode to look at the serial buffer.  Do this. Upload your program so we can see exactly what you're doing. Joe T.

Hi; The Data from the Scale is being sent as an ASCII String  ( Not an actual Number  - ML or MI) In Info Mode  in the PLC, look at the Serial Port  Monitor  and see what the data being received there looks like. Receive  as  a   Stream     of     Vector Length 3  ( convert 2 Bytes to Linked Element(MI) )  with the CR,LF as the End of Text(EOF)( Length 2) Make sure the 4th MI is set to   0x00   NULL      >>     12  34 56  0x00      (Note:  You can look at the MI's On Line  in HEX Format - easy read for ASCII Data) THEN  convert the ACSII String   to an ML  in the ladder. >>   Strings     ASCII to Num ( Have an ASCII Table handy ! ) DanT       

Hi;   For the HMI      Under Text,   List of texts            Create an Indexed List and call them by the      FaultCode  ( int 32)  ( your switch case index )  in the program                 ( FaultCode  being what ever name you choose )   In the Ladder  -  Use the    Compare =    to Set the  Fault Code   to the Fault number   or  -- this one is neet -- Under Solution explorer   use the   Switch Case   and set up the   FaultCode    to the List of Texts                  There is a lot of flexibility in this function   - Fixed  compares and ranges    with   Options for Actions Example  :    Case ID 1 ,  Name Case 1, Comparison Type - Value , From   #1 ( a Constant),  To   (Blank) ,   Action  (Store Tag)    , Tag (FaultCode)   Store into Tag ( #1   a Constant)   DanT  

Hi Joe, Thanks for the tips and help. However, I still have no communication. Just getting error -1. I tried exchanging the MI for an ML and it didn't solve. Then I tried using exactly the configuration you presented (stream with vector and with termination after 10mS) and other similar settings, such as 1 byte for a link, and none has worked yet. It may be that the problem lies elsewhere. The memory tab shows no value, even after online. It's normal? Could I be sending something wrong through the serial emulator? I am just using the "send" field and putting a number directly. (see the image) Perhaps it would not be necessary for me to be using the message structure as shown in the attached image? For example, could the absence of STX and ETX be causing this failure? Or is it that the presence of the configured ethernet must not be disturbing COM 1? I am using ethernet to program and monitor the PLC. Will serial port 1 on the PLC always be linked to COM 1?   Thanks for the Help.. Fábio

I want to store a specific string (read fixed) to a "string tag" according a value.  If value = 1, then string should be "OK" - value = 2, string is "NOT OK", value = 3, string is "FAULT...",.... OK, I know I can do this with the compare instructions, but I want to do this with the switch case instruction....😎 suggestions anybody ?