Examples Of External Wiring (Rotary Encoder); 1-Phase 1-Input [C235 To C245] - Mitsubishi FX3U SERIES User Manual

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

11.10 Examples of External Wiring (Rotary Encoder)

11.10.1 1-phase 1-input [C235 to C245]

The following examples of wiring apply to the cases where C235 is used. When another high-speed counter
number is used, wire the counter referring to the following diagrams.
1. When the input terminals of the main unit are used
When pulses having a response frequency of 50 k to 100 kHz are captured to the high-speed counter using
the input terminals X000 to X005, wire the counter as stated below.
• The wiring length should be 5m (16'4") or less.
• As connecting cables, use shielded twisted-pair cables. Ground the shield of each shielded cable only on
the PLC side.
• Connect a bleeder resistance of 1.5kΩ (1W or more) to the input terminal, so that the sum of the load
current of the open collector transistor output on the mating device side and the input current of the main
unit is 20 mA or more.
1) NPN open collector transistor output rotary encoder
In the case of sink wiring
PLC
* The grounding resistance should be 100Ω or less.
2) PNP open collector transistor output rotary encoder
In the case of source wiring
PLC
* The grounding resistance should be 100Ω or less.
198
Fuse
L
N
Class D
grounding*
S/S
0V
24V
1.5kΩ
X000
Fuse
L
N
Class D
grounding*
S/S
0V
24V
1.5
kΩ
X000
11 Use of High-speed Counters (C235 to C255)
11.10 Examples of External Wiring (Rotary Encoder)
Rotary encoder
24V DC
24V
0V
Phase A
Phase B
20mA or
Phase Z
more
Rotary encoder
24V DC
24V
0V
Phase A
Phase B
20mA or
Phase Z
more