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1.3 Cautions on Creation of Fundamental Programs
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
1.3.7 Limitation in the number of instructions and limitation in
simultaneous instruction instances
Each sequence instruction has a limitation in the number of using the instruction and the number of
simultaneous instances of instructions. The limitation, however, differs from one PLC to another.
Limitations in the number of instructions
Some instructions can be used only up to the specified number of times.
As for the instructions having a limited number of times of use and whose operands allow indexing, device
numbers and numeric values in such instructions can be changed by index registers. By indexing, when
driving multiple instances simultaneously is required, such instruction can be used as if they were used
beyond the allowable number of times.
→ FX Structured Programming Manual [Device & Common]
Note that some PLCs do not provide some instructions.
→ 2. Instruction List
FX
3S, FX3G, FX3GC, FX3U and FX3UC PLCs
FX
1S, FX1N, FX1NC, FX2N and FX2NC PLCs
Instruction
name
Allowable number of times of
use
Remarks
MTR 1 -
SPD
8
(1 instruction / 1 input or fewer)
Pay attention so that this instruction does not overlap the input numbers in interrupt
input in DVIT instruction, DOG inputs in ZRN instruction, zero point signal in DSZR
instruction, input interrupt numbers and high speed counter input numbers.
IST 1 -
SORT 1 FX3S, FX3G or FX3GC PLCs are not provided.
TKY 1 FX3S, FX3G or FX3GC PLCs are not provided.
HKY 1 FX3S, FX3G or FX3GC PLCs are not provided.
ARWS 1 FX3S, FX3G or FX3GC PLCs are not provided.
PR 2 FX3S, FX3G or FX3GC PLCs are not provided.
SORT2 2 FX3S, FX3G or FX3GC PLCs are not provided.
DUTY
5
(1 instruction / 1 output or fewer)
FX3S, FX3G or FX3GC PLCs are not provided.
DHSCT 1 FX3S, FX3G or FX3GC PLCs are not provided.
Instruction
name
Allowable number of times of use
FX1S, FX1N, FX1NC FX2N, FX2NC
MTR 1 1
SPD 1 1
PWM 1 1
IST 1 1
ABSD 1 1
INCD 1 1
ROTC FX1S, FX1N or FX1NC PLCs are not provided. 1
SORT FX1S, FX1N or FX1NC PLCs are not provided. 1
TKY FX1S, FX1N or FX1NC PLCs are not provided. 1
HKY FX1S, FX1N or FX1NC PLCs are not provided. 1
DSW No limit 2
SEGL No limit 2
ARWS FX1S, FX1N or FX1NC PLCs are not provided. 1
PR FX1S, FX1N or FX1NC PLCs are not provided. 2