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4-78 Series 90-30/20/Micro Programmable Controllers Reference Manual – September 1998 GFK-0467K
4
Parameters:
Parameter Description
enable When enable is energized and R is not, the shift is performed.
R When R is energized, the shift register located at ST is filled with zeros.
IN IN contains the value to be shifted into the first bit or word of the shift register. For
SHFR_BIT, any discrete reference may be used; it does not need to be byte aligned.
However, 16 bits, beginning with the reference address specified, are displayed online.
ST ST contains the first bit or word of the shift register. For SHFR_BIT, any discrete
reference may be used; it does not need to be byte aligned. However, 16 bits, beginning
with the reference address specified, are displayed online.
ok The ok output is energized whenever the function is enabled and R is not enabled.
Q Output Q contains the bit or word shifted out of the shift register. For SHFR_BIT, any
discrete reference may be used; it does not need to be byte aligned. However, 16 bits,
beginning with the reference address specified, are displayed online.
LEN LEN determines the length of the shift register. For SHFR_WORD, LEN must be
between 1 and 256 words. For SHFR_BIT, LEN must be between 1 and 256 bits.
Valid Memory Types:
Parameter flow %I %Q %M %T %S %G %R %AI %AQ const none
enable •
R •
IN • • • • • • • • • •
ST • • • • •† • • • •
ok • •
Q • • • • •† • • • •
• Valid reference for BIT or WORD data, or place where power may flow through the function.
For SHFR_BIT, discrete user references %I, %Q, %M, and %T need not be byte aligned.
† %SA, %SB, %SC only; %S cannot be used.