Publication 1763-RM001C-EN-P - October 2009
244
Sequencer Instructions
If the position is equal to zero at start-up, when you switch the controller
from the program mode to the run mode, the instruction operation
depends on whether the rung is true or false on the first scan.
•
If the rung is true, the instruction transfers the value in step zero.
•
If the rung is false, the instruction waits for the first rung transition
from false-to-true and transfers the value in step one.
The bits mask data when reset (0) and pass data when set (1). The
instruction will not change the value in the destination word unless you
set mask bits.
The mask can be fixed or variable. It is fixed if you enter a hexadecimal
code. It is variable if you enter an element address or a file address (direct
or indirect) for changing the mask with each step.
The following figure indicates how the SQO instruction works.
Destination O:14.0
External Outputs (O:14)
at Step 2
15
8 7
0
00
0000
0101
0000
1010
01
ON
02
Mask Value 0F0F
03
ON
15
8 7
0
04
0000
1111
0000
1111
05
06
Sequencer Output File #B10:1
07
Word
Step
08
ON
B10:1
0000
0000
0000
0000
0
09
B10:2
1010
0010
1111
0101
1
10
ON
B10:3
1111
0101
0100
1010
2
Current Step
11
B10:4
0101
0101
0101
0101
3
12
B10:5
0000
1111
0000
1111
4
13
14
15
EN
DN
SQO
Sequencer Output
File
#B10:1
Mask
0F0F
Dest
O14:0
Control
R6:20
Length
4<
Position
2<
SQO
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