move addressing

i am using logixpro simulator

is there a way to address a move as follows

4 bit binary value to the first 4 bit of output (ie. O:6/0-3)

differant 4 bit value to O:6/4-7

ect

Not sure about Logixpro, but if it is like RSLogix, look for a MVM (masked move) command. Basically you add a mask that allows only certain bits to "fall through" and get written to the output
* bits remain in same state as before MVM

bernie_carlton; said:

The MVM requires that the source bits be in the same 'bit' position in the source word as they will be in the destination word.

Click to expand...

If the bits are not in the correct position, you can re-map them so that they are, or look for a BTD command (bit field distribute in some flavors of RSLogix) which will allow you to choose a starting bit position.

Paul

The MVM requires that the source bits be in the same 'bit' position in the source word as they will be in the destination word. If not you can just 'brute force' it by a seperate 'contact ---> output' pair for each bit.

I recommend Bernie's suggestion, just use XIC OTE pairs.

Assuming 4 bit values are in N7:0 and N7:1



  N7:0/0          O:6/0

---] [-------------( )



  N7:0/1          O:6/1

---] [-------------( )



  N7:0/2          O:6/2

---] [-------------( )



  N7:0/3          O:6/3

---] [-------------( )



  N7:1/0          O:6/4

---] [-------------( )



  N7:1/1          O:6/5

 ---] [-------------( )



  N7:1/2          O:6/6

 ---] [-------------( )



  N7:1/3          O:6/7

 ---] [-------------( )

RElapse said:

---
differant 4 bit value to O:6/4-7

ect

Click to expand...

Oops, I missed that part, do as Alaric said, it will execute faster in a real A/B PLC than word instructions, and be easier to modify and understand.

LogixPro's limited ability to MOVE bits with Mask

In the first picture, a 4-bit value "1100" is Moved with MVM (Move-with-Mask), mask of 000Fh, to O:6.0 to O:6.3

In the second picture, a 4-bit value "0011" is Moved with MVM (Move-with-Mask), mask of 00F0h, to O:6.4 to O:6.7. Because the Destination does not have the same relative bit locations within the word, "0000" must be added to the 4-bit value, making it "0011 0000".