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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
14 Handy Instruction – FNC 60 to FNC 69
14.3 FNC 62 – ABSD / Absolute Drum Sequencer
1) Write the following data to [ , +1] to [ +4n-2, +4n-1] in advance using a transfer instruction:
For example, store rising point data and falling point data alternately.
2) Output pattern
When the command input is set to ON, "n" points starting from change as shown below.
Each rising point/falling point can be changed respectively by overwriting the data in [ +1, ] to
[ +4n-1, +4n-2].
Cautions
1. Specifying a high-speed counter (C235 to C255)
In DABSD instruction, a high-speed counter can be specified as .
When the high-speed counter is specified, the output pattern contains response delay caused by the scan cycle with
regard to the current value of a counter.
When high responsivity is required in FX
3U/FX3UC PLCs, use the table high-speed comparison function offered by the
HSZ instruction, or use the HSCT instruction.
2. When specifying digits of a bit device as
1) Device number
Specify a multiple of 16 (0, 16, 32, 64 ...).
2) Number of digits
- In ABSD instruction (16-bit operation): Only K4 is available.
- In DABSD instruction (32-bit operation): Only K8 is available.
3. Other cautions
• The value "n" determines the number of target outputs (1 ≤ n ≤ 64).
• Even if the command input is set to OFF, the ON/OFF status of outputs does not change.
Rising point Falling point
Target output
Data value
(example)
Data value
(example)
[+ 1,]
40
[+ 3,+ 2]
140
[+ 5,+ 4]
100
[+ 7,+ 6]
200
+1
[+ 9,+ 8]
160
[ + 11, + 10]
60
+2
[ + 13, + 12]
240
[ + 15, + 14]
280
+3
…
⎯
…
⎯
…
[ + 4n - 3, + 4n - 4] [ + 4n - 1, + 4n - 2] + n − 1
D
1
S
1
D
1
S
1
D
1
S
1
D
1
S
1
S
1
S
1
S
1
S
1
D
S
1
S
1
S
1
S
1
D
S
1
S
1
S
1
S
1
D
S
1
S
1
S
1
S
1
D
S
1
S
1
S
1
S
1
D
D
1
D
D
1
S
1
D
1
S
1
D
1
S
1
D
1
S
1
40 140
100 200
160
240 280
180
360
60
0
z
+3
+2
+1
D
D
D
D
D
1
S
2
D
1
S
1