ML 1500 combine 16 bit registers into 32 bit

Good Afternoon,

Have a co-worker trying to come up with a decent solution for the following problem.

Using a ML 1500 he is polling data via Modbus from a position controller. The actual position data comes back in two 16 bit registers. He needs to be able to combine the two registers into a single 32 bit register to properly display the position.

We have both looked (and probably overlooked) for an instruction that will perform this function.

Any assistance would be greatly appreciated.

Thanks,
gtsuport

See post two & four

http://www.plctalk.net/qanda/showthread.php?t=48927&highlight=CPW

And this one

http://www.plctalk.net/qanda/showthread.php?t=29509&highlight=CPW

I don't have any 1500's so I don't know how easy it will be to implement, but here's a generic solution for combining to 16 bit words into a 32 bit double or long word.

1. copy word1 to long word
2. multiply long word by 65536 to shift it 16 bits to the rights.
3. add word2 to the long word

multiply long word by 65536 to shift it 16 bits to the rights

Click to expand...

HBN - Hebrew Binary Notation