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SR, shift register
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02/16 MN05013001Z EN
Operation of the function block
The shift register has a linear structure. This means that a
clock pulse initiates the following actions:
• A new value/data bit is transferred to the register and the
other data is moved one place further in the register.
• The value/data bit at the other end of the register is
pushed out.
• Both shift directions, forwards and backwards, are
possible.
The function block has two operating modes for different
data formats:
• BIT for a bit data format
• DW for a double word data format.
In BIT mode, the function block uses
• Input coils: SR..FD and SR..BD.
• Register field contacts: SR..Q1 to SR..Q8.
In DW mode the function block processes inputs and outputs
in double word format:
• Inputs SR..I1 and SR..I2
• Outputs: SR..D1 to SR..D8.
SR..FD and SR..I1 are for data that the function block
transfers to register Q1 or D1 in a forwards direction when
SR..FP is activated.
The following two figures illustrate the process for forward
shift operations in BIT and DW modes.
h
The shift register function block must be enabled so that it
can work, i.e. the coil SR..EN must be active. If this is not
active, the entire function block is deactivated.
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