Forums.MrPLC.com > Moving Values

Hawkmoon42

Mar 9 2008, 04:59 PM

Using RSlogix 500 and a SLC 505, I want to move different values to 4 7 segment digital displays conected to O:4.0. How do I simply move values in BCD so as to display on any of the 4 displays.
ie 0000 0000 0000 0111 if moved to O:4.0 will display 7 in the first digital display from the left.
But if i want to move it to the second DD from the left how would I do this.
Thanks Gary

Mickey

Mar 9 2008, 05:49 PM

QUOTE(Hawkmoon42 @ Mar 9 2008, 04:59 PM) [snapback]66184[/snapback]

Using RSlogix 500 and a SLC 505, I want to move different values to 4 7 segment digital displays conected to O:4.0. How do I simply move values in BCD so as to display on any of the 4 displays.
ie 0000 0000 0000 0111 if moved to O:4.0 will display 7 in the first digital display from the left.
But if i want to move it to the second DD from the left how would I do this.
Thanks Gary

See Picture. Use the TOD instruction and move instruction.

Hawkmoon42

Mar 9 2008, 08:26 PM

Thanks Micky
I had worked it out my self actually.
I was to obsessed with moving part of a word, as in - 0000 0000 0000 0111 > 0000 0000 0111 0000
It never occured to me to multiply or devide the integer by 10 first, then convert to BCD, followed by using a masked move to the output

BobLfoot

Mar 10 2008, 08:04 AM

QUOTE(Hawkmoon42 @ Mar 9 2008, 09:26 PM) [snapback]66187[/snapback]

Thanks Micky
I had worked it out my self actually.
I was to obsessed with moving part of a word, as in - 0000 0000 0000 0111 > 0000 0000 0111 0000
It never occured to me to multiply or devide the integer by 10 first, then convert to BCD, followed by using a masked move to the output

The PLC 5 and COntrollogix have a nuce command called Bit Field Distribute which allows you to move "nibbles" won't help in this case but might in another processor family.