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Siemens LOGO Soft Comfort Online Help Manual

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Reference material
5.3 Special functions
LOGO!Soft Comfort Online Help
Operating Instructions, 11/2017
359
Particular characteristics to be noted when configuring
The softkey can be used both with momentary pushbutton or switching action. At the status
parameter you can define the on (actuated) or off state for the switch/pushbutton.
If the softkey is assigned a pushbutton action, the output is always set for the duration of one
cycle with a 0 to 1 transition at input En when the pushbutton is in on state, or if the
pushbutton state changes from Off to On when En=1.
Special functions (Page 241)
5.3.6.8
Shift register (LOGO! 8.FS4 and later versions only)
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 LOGO! 8.FS4 devices, you can use a maximum of four shift registers with eight bits for
each 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 edge (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 Sx.1 to Sx.8 at the Dir input:
Dir = 0: shift up (Sx.1 >> Sx.8)
Dir = 1: shift down (Sx.8 >> Sx.1)
NOTE:
"x" refers to the index of the shift register.
Input
R
The SFB is reset with a positive edge (0 to 1 transition) at input
R
(Reset). When the
SFB is reset, all the shift register bit (Sx.1 to Sx.8) and the output at Q are set to 0.
Parameter
Shift register index:
the index of shift register in the circuit program.
Possible settings: 1 to 4
Shift register bit
that determines the value of output Q.
Possible settings: 1 to 8
Retentivity set (on) = the status is retentive in memory.
Output Q
The output value corresponds with the configured shift register bit.
… 359 …


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