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Standard function blocks
300
02/16 MN05013001Z EN
SR, shift register
The shift register function block enables you to move bits or
marker double words one position forwards or backwards
with every clock pulse, depending on whether Bit or Double
word (DW) mode is selected. The shift register has a linear
structure. If, for example, a bit is added at one end of the
shift register in a bit operation with a clock pulse, a bit will
be pushed out at the other end. You can choose between
two operating modes:
• Bit (BIT).
• Double word (DW).
easySafety allows the use of up to 16 shift registers.
Function block
Figure 142: Shift register function block
a
Coil SR..EN: Enables the operation of the function block.
b
Coil SR..FP: Clock pulse forwards.
c
Coil SR..BP: Clock pulse backwards.
d
Coil SR..RE: Resets the shift register to zero.
SR...
Shift Register
EN
RE
BP
FP
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
D1>
D2>
D3>
D4>
D5>
D6>
D7>
D8>
>I1
>I2
FD
BD
DW
DW
DW
DW
DW
DW
DW
DW
DW
DW
a
b
c
d
e
f
g
h
i
j
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