5.3 Description of Function Codes 5.3.10 U codes (Customizable logic operation)
Operating precautions
The customizable logics are executed within 1 ms to 20 ms (according to U100) and processed in the following
procedure:
(1) First, latch the external input signals for all the customizable logics from step 1 to 260 to maintain synchronism.
(2) Perform logical operations sequentially from step 1 to 260.
(3) If an output of a step is an input to the next step, outputs of step with high priority can be used in the same
process.
(4) The customizable logic simultaneously updates 14 output signals.
The step execution order for multi-tasks is shown in the following diagram.
1ms
1
10
1ms 1
1ms
1ms
2ms
11
15
2ms
5ms
21
26
5ms
10ms
51
55
10ms
20ms
101
1 05
20ms
1ms
1
10
1ms 2
1ms
1ms
16
20
2ms
27
32
5ms
56
60
10ms
106
1 10
20ms
2ms
1ms
1
10
1ms 5
1ms
1ms
2ms
11
15
2ms
45
50
5ms
71
75
10ms
1 21
125
20ms
1ms
1
10
1ms 6
1ms
1ms
16
20
2ms
5ms
21
26
5ms
76
80
10ms
1 26
1 30
20ms
2ms
5ms
1ms
1
10
1ms 9
1ms
1ms
2ms
11
15
2ms
39
44
5ms
91
95
10ms
1 41
1 45
20ms
1ms
1
10
1ms 10
1ms
1ms
16
20
2ms
45
50
5ms
96
100
10ms
146
1 50
20ms
2ms
5ms
10ms
1ms
1
10
1ms 19
1ms
1ms
2ms
11
15
2ms
39
44
5ms
91
95
10ms
1 91
1 95
20ms
1ms
1
10
1ms 20
1ms
1ms
16
20
2ms
45
50
5ms
96
100
10ms
196
2 00
20ms
2ms
5ms
10ms
20ms
Note that if you do not consider the process order of customizable logic when configuring a function block, the
expected output may not be obtained, the operation can be slower or a hazard signal can occur, because the output
signal of a step is not available until the next cycle.
Logical operation
Step 1 → 2 → 3 · · · 200
Simultaneous
update of
output signals
1 ms output
signal update
1 ms output
signal update
2 ms output
signal update
1 ms output
signal update
5 ms output
signal update
1 ms output
signal update
2 ms output
signal update
1 ms output
signal update
1 ms output
signal update
2 ms output
signal update
5 ms output
signal update
10 ms output
signal update
1 ms output
signal update
1 ms output
signal update
2 ms output
signal update
5 ms output
signal update
10 ms output
signal update
20 ms output
signal update
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