Manipulating L# data type in ML1400

[RPax]

Hi, I was wondering if you could help. I am using a Micrologix 1400 where I have an 11 digit number loaded in a L# data type (doubleword). This comes from a barcode scanner.

I need to send this value to another ethernet connection (Via TCP IP) which only accepts either Word or Real. When i move the L# data type to a floating point and use the MSG instruction the value comes out truncated on the other side.

I was wondering is it possible to split the L# data type 11 digit number and send as 2words\integers i.e 6 digits in one word and 5 in the other or something to that effect. On the recieving side I can put back together.

Appreciate your help on this - Rpax

 

[Christoff84]

Even using 6 digits is outside the range of a word/int. Can you use a ST file to store the 11 digit string as ascii code? I guess it depends on what your receiving device is capable of understanding and how flexible it is to piece something back together. I would think you could transmit the ascii string in word chunks, as long as your receiver can be told to interpret the result as ascii characters.

 

[Christoff84]

My mistake, looks like you can directly reference each bit in the L file. If this is the case, just have each bit turn on a bit in an N file.

ex. XIC L9:1/0 OTE N7:0/0...etc

Once you have that, just send the data across (N7:0 and N7:1 in this case) and piece it back together in the receiver. Just be aware it won't show up properly in the PLC as the N words ae signed ints.

 

[RPax]

Thanks for the reply, as a matter of interest is it possible to move an L# Long Word into a floating point without the number being rounded up? Thanks again

 

[bernie_carlton]

In all likelihood you Long has more significant digits that the float can represent. It takes the next nearest number that it can represent.

 

[RPax]

Thanks again for you replies. Unfortunetely, my mapping from the L data type bit to two interger bits wasn't sucessfull as when I sent the data to the processor on the other side it picked up the digital number incorrectly. I also couldn't map over a floating point due to the rounding up issue as Bernie mentioned.

What I plan to do is take a 9 digit scanned number in an L data type and break it up into 3 seperate 3 digit numbers i.e. 123456789 will now be loaded into integers as N7:20 123, N7:21 456 and N7:22 789 and send over.

Due to the problems with the rounding up issue in calculations I was wondering would the following few code lines be correct(attached PDF) to do the above?. Appreciate any advice on this RPax