Natural Binary 9bits to Decimal ControlLogix5000

Hello,

I've a fast input card (1769-IQ16F) and a encoder that works in natural binary with 9 bits (845DSJDZ25ANDW4), and I need to convert this input to a decimal code.
I'm working with ControlLogix 5000 (the plc is a compaq logix), and I see there is a BCD to Decimal block, but I can't see a block that works with natural binary.

Could you please help me to solve this convertion?


Thanks and best regards

Juan

There is no need for a conversion as the numbering system for integers within the ControlLogix system is, as you describe, 'natural binary.

If the encoder occupies the lowest nine inputs of the card then use the AND instruction with the input card as the first source, 511 (decimal) or 1FF (hexadecimal) as the AND mask and your chosen destination as the third argument.

If the bits occupy higher inputs then the mask would change (use your Windows calculator) and the result would have to be right-shifted the appropriate number of places.

Thanks, I'll try that and let you all know, but I'm shure it'll work this way.


Best regards

It might be 9-bit Signed Binary, in which case bit 8 would be the sign bit.

If you put this into an CompactLogix DINT, then you could....

XIC bit 8, OTE bit 31, OTU bit 8

Bernie's "right-shift" would be easier with a BTD instruction.