PLC5 COP to MVM

Have a need to mask some bits that are currently being copied from one integer file to another. Looks like the MVM instruction is fairly straight forward, can I just replace the current COP to a MVM?

COP
Source #N10:12
Dest #N22:52
Length 2

Do I need two MVM instructions to do this? It has no length parameter, so assuming it only does one integer per instruction.

MVM
Source N10:12
Mask XXXX
Dest N22:52

MVM
Source N10:13
Mask XXXX
Dest N22:53

Yes, the MVM works on a single 16 bit word, so you do need two of them.

I just want to make sure you know that the MVM instruction is not like a bitwise AND. The MVM will leave unaffected the bits in the destination aligned with a 0 in the mask. As an example:

Source 0000 1111 0000 1111
Mask 0101 0101 0101 0101

Destination before operation:
1010 1010 1010 1010

Destination after operation:
1010 1111 1010 1111

Keith

here is a tutorial on the Move instructions. At the 6 min mark is the MVM instruction. Hope this helps.
https://ladiesandtech.com/2016/03/14/watch-rslogix-tutorial-on-move-instructions-part-1-on-youtube/

Thanks!