Micrologix 1400 combine 2 words

[bwiring]

How do es a person combine two words of data into one. N7:0 and N7:1, High word and Low word, 1234 and 5678 and get 12345678.

 

[Mickey]

Multiple N7:0 (1234) X 10000 then add N7:1 (5678). Your destination(s) will have to be a "floating point" or "Long" data type.

 

[bwiring]

Micky thanks for the quick response. I did that using a long word data type and the processor faulted with a 20h fault. any suggestions?

 

[ASF]

Some information on the fault code is attached. As Mickey said, make sure that the destination of all your math instructions are a LONG data type (not INT), and follow the advice from the manual below if necessary.

Also be aware that the "multiply by 10000" trick will only work if your first value always has 4 digits. If you had 123 and 456, you'd get 1230456, not 123456. If different digit counts are a possibility, you might have to do some trickery with dividing by 10 until you get a number less than 10, see how many divides you have to do, and then multiply by [10 times that number].

 

[Donnchadh]

Hi

I Would place the otu in the bottom of lad 2

Donnchadh

 

[chelton]

I think you need to multiply n7:0 by 0x10000 (10000 hex) or 65536 to move the first word to the high word of the destination.

 

[Mickey]

Post your .RSS filw (zip it first) If what ASF said did not work.

A "CPT" ( compute instruction) should work, with a destination of a long data type.

Move N7:0 to L9:0
Move N7:1 to L9:1

Then:

(L9:0*10000)+L9:1=L9:2

Let us know.

 

[jrwb4gbm]

Just curious, could a masked move MVM be used to do this? Seems like I did it this way once many years ago.