Siemens LOGO!, Manual

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LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 04/2011, A5E03556174-01
245
Let us assume you want to set 'Switch' (On).
1.
Change to the editing mode: Confirm with OK (the cursor is now positioned on 'Off')
2. To change from 'Off' to 'On': Press or
3. Confirm your entries with Press OK
%
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4.4.27 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 shifting
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 transition) at input Trg
(Trigger) starts the special function. 1 to 0 transitions
are irrelevant.
Input Dir The signal at input Dir determines the shifting
direction for the shift register bits S1 to S8 (if 0BA6)
or Sx.1 to Sx.8 (if 0BA7). "x" refers to the configured
shift register byte index 1, 2, 3, or 4.
Dir = 0: Shift up
(0BA6: S1 >> S8; 0BA7: Sx.1>>Sx.8)
Dir = 1: Shift down
(0BA6: S8 >> S1; 0BA7: Sx.8>>Sx.1)
Parameter Shift register bit that determines the value at output
Q.
Possible settings (if 0BA6):
S1 to S8
Possible settings (if 0BA7):
Byte index: 1 to 4
Q: S1 to S8
LOGO! 0BA7 provides a maximum of 32 shift register
bits, with 8 bits per shift register.
Retentivity:
/ = No retentivity
R = The status is retentive.
4
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Output Q The output value corresponds with the configured
shift register bit.