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Coding of Fig.
4-18.
20
L D
MO. 3
21
o w
C M
22
K
100
23
. L D
M
05
24
R S T
COS
4-3-8. SFT
...
Temporary memory shift
By application of an SFT instruction to a temporary memory
(M), a 1 bit shift register can be composed.
By linked application of SFT instructions to a temporary
memory (M), a shift register for the number of links can be
established.
When a shift signal M02 is given to a temporary memory Mj,
this memory has the function for processing as follows under
consideration of the status of the preceding Mj-1.
/"'
' ?
-
Fig. 4-20. SFT instructions
M.j
=
1 for
Mj
-
1
=
1
Mj
==
0 for Mj
-
1
=
0
Mj-1 becomes 0 after SFT instruction execution.
i
When this instruction is used, the number s f required steps (M link number) must use consecutive
M.
Aslo, as the shift signal M02 may be continuous if seen with the programmable controller inside
the seanning time, reverse arrangement as follows should be executed in regard to the sequence
arrangement. Normally, the shift signal will use the pulse form M changed from input
X.
-27-
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