156
5-15-7 ONE DIGIT SHIFT LEFT – SLD(74)
Ladder Symbols Operand Data Areas
SLD(74)
St
E
@SLD(74)
St
E
St: Starting word
IR, SR, AR, DM, HR, LR
E: End word
IR, SR, AR, DM, HR, LR
Limitations St
and E must be in the same data area, and St must be less than or equal to E.
Description When
the execution condition is OFF
, SLD(74) is not executed. When the execu
-
tion condition is ON, SLD(74) shifts data between St and E (inclusive) by one
digit (four bits) to the left. 0 is written into the rightmost digit of the St, and the
content of the leftmost digit of E is lost.
5
E
8 1
St
F C 97D
Lost
data
0
...
Precautions If
a power failure occurs during a shift operation across more than 50 words, the
shift operation might not be completed.
Flags ER: The St and E words are in different areas, or St is greater than E.
Indirectly
addressed DM word
is non-existent. (Content of
∗
DM word is
not BCD, or the DM area boundary has been exceeded.)
5-15-8 ONE DIGIT SHIFT RIGHT – SRD(75)
Ladder Symbols Operand Data Areas
SRD(75)
E
St
@SRD(75)
E
St
E: End word
IR, SR, AR, DM, HR, LR
St: Starting word
IR, SR, AR, DM, HR, LR
Limitations St
and E must be in the same data area, and St must be less than or equal to E.
Description When
the execution condition is OFF
, SRD(75) is not executed. When the exe
-
cution
condition is ON, SRD(75) shifts data between St and E
(inclusive) by one
digit
(four bits) to the right. 0 is written into the leftmost digit of St and the right
-
most digit of E is lost.
2
St
3 1
E
4 5 C8F
Lost
data
0
...
Data Shifting Section 5-15
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