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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
13 High-Speed Processing – FNC 50 to FNC 59
13.1 FNC 50 – REF / Refresh
13.1.1 What should be understood before using the REF instruction
1. Changing the input filter
The input filter value is determined by the contents of D8020 (initial value: 10 ms).
Use the MOV instruction, etc. to adjust the value in D8020, which represents the input filter value.
Target range: X000 to X017 (In inputs X020 and later, the input filter value is fixed at 10 ms and cannot be
changed.)
(The target range is X000 to X007 in the FX
3G, FX3U-16M, FX3UC-16M.)
2. Output response time
After the REF instruction is executed, the output (Y) sets the output signal to ON after the response time shown below.
→ For details, refer to the respective PLC Hardware Edition manual.
Target range: Y000 to highest connected output number
1) Relay output type
The output contact is activated after the response time of the output relay.
- Y000 and higher: Approximately 10 ms
2) Transistor output type
a) FX
3U/FX3UC(D, DSS) PLC
- Y000, Y001 and Y002: 5μs or less (load current = 10 mA or more, 5 to 24V DC)
- Y003 and higher: 0.2ms or less (load current = 100 mA, 24V DC)
b) FX
3UC -32MT-LT(-2) PLC
- Y000, Y001, Y002 and Y003: 5μs or less (load current = 10 mA or more, 5 to 24V DC)
- Y004 and higher: 0.2ms or less (load current = 100 mA, 24V DC)
c) FX
3G PLC (14-point and 24-point type)
- Y000 and Y001: 5μs or less (load current = 10 mA or more, 5 to 24V DC)
- Y002 and higher: 0.2ms or less (load current = 100 mA, 24V DC)
d) FX
3G PLC (40-point and 60-point type)
- Y000, Y001 and Y002: 5μs or less (load current = 10 mA or more, 5 to 24V DC)
- Y003 and higher: 0.2ms or less (load current = 100 mA, 24V DC)
3) Triac output type
- Y000 and higher: 1ms or less (OFF → ON), 10ms or less (ON → OFF).
3. When using the REF instruction between FOR and NEXT instructions or between a pointer (with
a lower step number) and CJ instruction (with a higher step number)
Inputs and outputs can be refreshed even when the input information or immediate output is required in the middle of
a routine program during control.
4. When using the input interrupt (I) function
When executing interrupt processing accompanied by I/O operations, I/O refresh can be executed in the interrupt
routine to receive the latest input (X) information and give the immediate output (Y) of the operation result so that
dispersion caused by the operation time is improved.
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