2-Phase 2-Input [C251 To C255] - Mitsubishi Electric MELSEQ FX3S Series User Manual

FX Series Programmable Controllers
3S
User's Manual - Hardware Edition

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
Sink wiring
X000
X001
PLC
2) PNP open collector transistor output rotary encoder
Source wiring
PLC
The grounding resistance should be 100 Ω or less.
*1.
Fuse
L
*1
Class D grounding
N
S/S
0V
24V
Fuse
L
*1
Class D grounding
N
S/S
0V
24V
X000
X001
10.8 Examples of External Wiring (Rotary Encoder)
Rotary encoder
24 V DC
24V
0V
A-phase
B-phase
Z-phase
Rotary encoder
24 V DC
24V
0V
A-phase
B-phase
Z-phase
10 Use of High-speed Counters
95
1
2
3
4
5
6
7
8
9
10