SLC 500 COP Problem

I have pulled up an old program using rs/logics on an AB SLC 500. The problem is I have a COP with the source being a #I:6.1 which is an analog input. Both the source and the destination #N230:135 are at 0. I wrote a rung into this program, SCP with the above input so I could see it and it's there and acting as it should. Why doesn't something show with the COP command?

siralexe

I think you are asking "why doesn't a value from that location show within the COP command?"

Because a COP command could copy MANY locations (thus the 'length' argument) which one (the first ?) should it show the value of? I guess it therefore shows none of them.

The length argument is there at 2 and this is an analog input. Do I then need all locations in that word to obtain the decimal number from the binary number.

If I understand you correctly you have

---+-COP-------------+-

   |Copy File        |

   |Source    #I:6.1 |

   |Dest    #N230:135|

   |Length          2|

   +-----------------+

This will copy two 16 bit words; I:6.1 will be copied to N230:135 and I:6.2 will be copied to N230:136.

If you want to move just one word then use the MOV instruction.

When you look at the input file, I:6.1 and I6.2, what do you see? When you look at the destination data file, N230:135 and N230:136 what do you see? I assume you are online when you look at these. Do they appear like what you expect?