Siemens LOGO! - Shift Register

213
LOGO! Manual
A5E00380835-01
4.4.25 Shift register
Short description
You can use the shift register function to read the value of
an input and to shift its bits left or right. The output value
corresponds with the configured shift register bit. The shift-
ing direction can be changed at a special input.
Symbol in
LOGO!
Wiring Description
Input In Input read at the start of the
function.
Input Trg A positive edge (0 to 1 tran-
sition) at input Trg (Trigger)
starts the special function.
1 to 0 transitions are irrele-
vant.
Input Dir The signal at input Dir de-
termines the shifting direc-
tion for the shift register bits
S1...S8 an:
Dir = 0: Shift up (S1 >> S8)
Dir = 1: Shift down (S8 >>
S1)
Parameter
Shift register bit that deter-
mines the value at output Q.
Possible settings:
S1 ... S8
Retentivity:
/ = No retentivity
R = The status is retentive.
Output Q The output value corre-
sponds with the configured
shift register bit.
LOGO! functions