PLC hardware interface for BCD input
I would have to guess you are dealing with binary input to bcd output. A DM74185A per bcd set with a  MM74C902 if you need buffering etc. 

Its very hard to figure out what you needed. But a binary shift register is what seems to fit your application. Of course, you can do it with 16 jk flip-flops and 4 quad nor gates instead of four 74185 ic chips.

I would guess that you would do the 10's compliment bcd circuit with the 74185.