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Data Shift Instructions Section 3-9
Description SRD(075) shifts data between St and E by one digit (4 bits) to the right. “0” is
placed in the leftmost digit (bits 15 to 12 of E), and the content of the rightmost
digit (bits 3 to 0 of St) is lost.
Flags
Precautions When St is greater than E, an error will be generated and the Error Flag will
turn ON.
When SRD(075) is executed, the Equals Flag and Negative Flag will turn
OFF.
Note When large amounts of data are shifted, the instruction execution time is quite
long. Always take care that the power is not cut while SRD(075) is being exe-
cuted, causing the shift operation to stop halfway through.
Examples When CIO 000000 is ON, words CIO 0100 through CIO 0102 will shift by one
digit (4 bits) to the right. A zero will be placed in bits 12 to 15 of CIO 0102 and
the contents of bits 0 to 3 of word CIO 0100 will be lost.
3-9-19 SHIFT N-BIT DATA LEFT: NSFL(578)
Purpose Shifts the specified number of bits to the left.
Ladder Symbol
Variations
Applicable Program Areas
Operands C: 0000 to 000F hex (0 to 15)
N: 0000 to FFFF hex (0 to 65535)
ES
Lost
t
Name Label Operation
Error Flag ER ON when St is greater than E.
OFF in all other cases.
E
Lost
St
St: CIO 0100St+1: CIO 0101E: CIO 0102
NSFL(578)
D
C
N
D: Beginning word for shift
C: Beginning bit
N: Shift data length
Variations Executed Each Cycle for ON Condition NSFL(578)
Executed Once for Upward Differentiation @NSFL(578)
Executed Once for Downward Differentiation Not supported
Immediate Refreshing Specification Not supported
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
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