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FX
3G
/FX
3U
/FX
3UC
 Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
B Instruction Execution Time
B-6 Execution Time on Combination of Applicable Devices and Indexing
Appendix B-6 Execution Time on Combination of Applicable Devices and 
Indexing
In examples shown below for basic instructions, MOV instruction and data comparison instructions, the instruction
execution time varies depending on the combination of target devices and absence/presence of indexing.
The combinations of target devices marked with "*1" and "*2" are handled as exceptions because high speed
processing is adopted in the technique.
Appendix B-6-1
Basic instruction (LD/LDI/AND/ANI/OR/ORI) execution time
• FX
3U
/FX
3UC
 PLCs
• FX
3G
 PLCs do not support indexing of bit devices and contact instructions with bit specification of word devices in 
basic instructions.
Appendix B-6-2
Applied instruction execution time
1. MOV (FNC 12) instruction execution time
• FX
3U
/FX
3UC
 PLCs
- MOV instruction (16-bit operation)
*1.
These combinations are handled as exceptions because high speed processing is adopted in the technique.
*2.
When the instruction is executed for a BFM in a special extension block/unit for FX
3U
/FX
3UC
 Series.
- DMOV instruction (32-bit instruction)
*1.
These combinations are handled as exceptions because high speed processing is adopted in the technique.
*2.
When the instruction is executed for a BFM in a special extension block/unit for FX
3U
/FX
3UC
 Series.
Specified device type
Condition
Instruction execution time
Bit device
Without indexing
0.065
With indexing
11.9
Word device
Bit specification
8.8
Command 
contact
S (source)
D (destination)
Without indexing (
µs)
With indexing (
µs)
KnY,KnM,KnS
T,C,D
R
U…\G…
*2
KnY,KnM,KnS
T,C,D
R
U…\G…
*2
ON
KnX,KnY,KnM,KnS
15.5
12.1
13.8
212.9
18.6
16.6
16.9
214.7
T,C,D
12.1
0.64
*1
10.4
209.7
16.6
14.5
14.8
212.8
R
13.8
10.4
12.1
211.3
16.9
14.8
15.1
213.1
U…\G…
*2
131.8
128.5
130.2
377.9
133.1
129.9
131.5
379.4
K,H
12.5
0.64
*1
10.8
210.1
15.4
13.3
13.6
211.6
OFF
KnX,KnY,KnM,KnS
0.325
T,C,D
0.32
*1
R
U…\G…
*2
K,H
0.32
*1
Command 
contact
S (source)
D (destination)
Without indexing (
µs)
With indexing (
µs)
KnY,KnM,KnS
T,C,D
R
U…\G…
*2
KnY,KnM,KnS
T,C,D
R
U…\G…
*2
ON
KnX,KnY,KnM,KnS
15.5
12.4
13.8
311.1
18.7
17.0
17.1
313.0
T,C,D
12.4
1.48
*1
10.7
307.4
17.0
15.2
15.3
310.5
R
13.8
10.7
12.2
308.9
17.1
15.3
15.4
310.6
U…\G…
*2
199.8
195.9
197.4
542.6
201.2
197.3
198.8
544.0
K,H
13.0
1.48
*1
11.4
308.0
16.2
14.4
14.5
309.7
OFF
KnX,KnY,KnM,KnS
0.585
T,C,D
1.48
*1
R
U…\G…
*2
K,H
1.48
*1