Shift Register - Sft(10) - Omron SYSMAC C20P Operation Manual

Data Shifting
5–12–1 Shift Register – SFT(10)
Limitations
Description
E
Lost
data
Flags
78
condition. SFTR(84) creates a reversible shift register that is controlled
through the bits in a control word. WSFT(16) creates a multiple-word register
that shifts by word.
Ladder Symbol
I
P
R
E must be less than or equal to St, and St and E must be in the same data
area.
If a bit address in one of the words used in a shift register is also used in an
instruction that controls individual bit status (e.g., OUT, KEEP(11)), an error
("COIL DUPL") will be generated when program syntax is checked on the
Programming Console or another Programming Device. The program, how-
ever, will be executed as written. See Example 2: Controlling Bits in Shift
Registers for a programming example that does this.
SFT(10) shifts an execution condition into a shift register. SFT(10) is con-
trolled by three execution conditions, I, P, and R. If SFT(10) is executed and
1) execution condition P is ON and was OFF the last execution and 2) R is
OFF, then execution condition I is shifted into the rightmost bit of a shift regis-
ter defined between St and E, i.e., if I is ON, a 1 is shifted into the register; if I
is OFF, a 0 is shifted in. When I is shifted into the register, all bits previously
in the register are shifted to the left and the leftmost bit of the register is lost.
St + 1, St + 2, ...
The execution condition on P functions like a differentiated instruction, i.e., I
will be shifted into the register only when P is ON and was OFF the last time
SFT(10) was executed. If execution condition P has not changed or has gone
from ON to OFF, the shift register will remain unaffected.
St designates the rightmost word of the shift register; E designates the left-
most. The shift register includes both of these words and all words between
them. The same word may be designated for St and E to create a 16-bit (i.e.,
1-word) shift register.
When execution condition R goes ON, all bits in the shift register will be
turned OFF (i.e., set to 0) and the shift register will not operate until R goes
OFF again.
There are no flags affected by SFT(10).
Operand Data Areas
SFT(10)
St
E
Section 5–12
St : Starting word
IR, HR
E : End word
IR, HR
St
Execution
condition I