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Siemens LOGO Soft Comfort Online Help Manual

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5.3 Special functions
LOGO!Soft Comfort Online Help
Operating Instructions, 11/2017
363
This value is written to shift register bits (Page 220) Sx.1 to Sx.8, depending on the set shift
direction:
● Dir = 0 (Shift up): Sx.1 accepts the value of input In, the previous value of Sx.1 is shifted
to Sx.2, Sx.2 to Sx.3 ... Sx.7 to Sx.8
● Dir = 1 (Shift down): Sx.8 accepts the value of input In; the previous value of S1.8 is
shifted to Sx.7, Sx.7 to Sx.6 ... Sx.2 to Sx.1.
Q outputs the value of the configured shift register bits.
If retentivity is not enabled, the shift function restarts at Sx.1 or Sx.8 after a power failure.
Special functions (Page 241)
5.3.6.10
Shift register (0BA4 to 0BA6)
Short description
The shift register function reads an input value and shifts the bits. The output value
corresponds with the configured shift register bit. The shift direction can be changed at a
special input. For device series 0BA4 to 0BA6, you can use only one shift register in one
circuit program.
Connection
Description
Input In
The function when started reads this input value.
Input
Trg
The SFB is started with a positive edg
e (0 to 1 transition) at input Trg (Trigger). A
1 to 0 transition is irrelevant.
Input
Dir
You define the shift direction of the shift register bits S1...S8 at the Dir input:
Dir = 0: shift up (S1 >> S8)
Dir = 1: shift down (S8 >> S1)
Parameter
Shift register bit
that determines the value of output Q.
Possible settings: S1 to S8
Retentivity set (on) = the status is retentive in memory.
Output Q
The output value corresponds with the configured shift register bit.
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