Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 120)

Publication 1760-UM001D-EN-P - September 2005
4-60 Draw a Circuit Diagram with Pico
4x Shift Register
You can use a shift register for storing an item of information, e.g.
sorting parts into good and bad; two, three, or four transport steps
further on.
A shift pulse and the value (0 or 1) to be shifted are needed for the
shift register.
The shift register's Reset input is used to clear any values that are no
longer needed. The values in the shift register pass through the
register in the following order.
1st, 2nd, 3rd, 4th storage position.
Block diagram for the 4x shift register:
Assign the meaning ‘bad part’ to the value 0. This ensures that no bad
parts will be reused if the shift register is accidentally deleted.
Function
Pulse Value Storage Location
1 2 3 4
1 1 1 0 0 0
2 0 0 1 0 0
3 0 0 0 1 0
4 1 1 0 0 1
5 0 0 1 0 0
Reset = 1 0 0 0 0
Item Function
I1 Shift pulse (PULSE)
I2 Information (good/bad) to be shifted (VALUE)
I3 Delete content of the shift register (RESET)
M1 First storage position
Pulse Value Reset