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10 Use of High-speed Counters
95
FX3S Series Programmable Controllers
User's Manual - Hardware Edition
1
Introduction
2
Features and
Part Names
3
Product
Introduction
4
Specifications
5
Version and
Peripheral
Devices
6
System
Configuration
7
Installation
8
Preparation and
Power Supply
Wiring
9
Input Wiring
10
High-Speed
Counters
10.8 Examples of External Wiring (Rotary Encoder)
10.8.2 2-phase 2-input [C251 to C255]
The following examples of wiring apply to the cases where C251 is used.
When another high-speed counter number is used, wire the counter referring to the following diagrams.
It is recommended to use shielded twisted-pair cables for connection cables. Ground the shield of each
shielded cable only on the PLC side.
1) NPN open collector transistor output rotary encoder
2) PNP open collector transistor output rotary encoder
*1. The grounding resistance should be 100 or less.
Sink wiring
S/S
24V
Class D grounding
*1
Fuse
0V
X000
X001
L
N
0V
24V
PLC
Rotary encoder
24 V DC
Z-phase
B-phase
A-phase
Source wiring
Class D grounding
*1
Fuse
Rotary encoder
24 V DC
Z-phase
B-phase
A-phase
S/S
24V
0V
X000
X001
L
N
0V
24V
PLC