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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.7 High-Speed Counter [C] (FX3S/FX3G/FX3GC PLCs)
1
Introduction
2
Overview
3
Instruction
List
4
Devices
in Detail
5
Specified the
Device &
Constant
6
Before
Programming
7
Basic
Instruction
8
FNC00-FNC09
Program Flow
9
FNC10-FNC19
Move & Compare
10
FNC20-FNC29
Arith. & Logic
Operation
4.7.2 Input assignment for high-speed counters
Inputs X000 to X007 are assigned as shown in the table below according to each high-speed counter number.
When a high-speed counter is used, the filter constant of a corresponding input number in the main unit automatically
changes.
•FX
3S PLC
X000, X001: 10
µs
X002, X003, X004, X005, X006, X007: 50
µs
•FX
3G/FX3GC PLCs
X000, X001, X003, X004: 10
µs
X002, X005, X006, X007: 50
µs
Input terminals not used for high-speed counters, however, can be used as general inputs.
→ For the input specifications of the main unit, refer to the Hardware Edition of the main unit.
U: Up-counting input D: Down-counting input A: A phase input
B: B phase input R: External reset input S: External start input
Restriction to overlap input numbers
Inputs X000 to X007 are used for high-speed counters, input interrupt, pulse catch, SPD/ZRN/DSZR instructions and
general-purpose inputs. When assigning functions, there should be no overlap between those input terminals.
Counter No.
Input terminal assignment
X000 X001 X002 X003 X004 X005 X006 X007
1-phase
1-count
input
C235 U/D
C236 U/D
C237 U/D
C238 U/D
C239 U/D
C240 U/D
C241 U/D R
C242 U/D R
C243 U/D R
C244 U/D R S
C245 U/D R S
1-phase
2-count
input
C246 U D
C247 U D R
C248 U D R
C248(OP) U D
C249 U D R S
C250 U D R S
2-phase
2-count
input
C251 A B
C252 A B R
C253 A B R
C253(OP)
A B
C254 A B R S
C254(OP)
A B
C255 A B R S