Mitsubishi FX3UC SERIES User Manual page 194

FX Series Programmable Controllers
3UC
User's Manual - Hardware Edition
7.2 Rotary Encoder [High-speed Counters C235 to C255]
7.2.1 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.
Caution
As connecting cables, use shielded twisted-pair cables. Ground the shield of each shielded cable only on the
PLC side.
When pulses having a response frequency of 50 to 100kHz 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.
• 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 20mA or more.
1. NPN open collector transistor output rotary encoder
1) In case of the FX
PLC
* The grounding resistance should be 100Ω or less.
2) In case of the FX
PLC
* The grounding resistance should be 100Ω or less.
188
→ For input allocation in high-speed counters, refer to Subsection 5.5.2.
- MT/D, FX
3UC 3UC
Fuse
+
-
Class D
grounding*
1.5
kΩ
COM
X000
- MT/DSS [Sink input wiring]
3UC
Fuse
+
-
Class D
grounding*
COM0
1.5
kΩ
X000
7.2 Rotary Encoder [High-speed Counters C235 to C255]
-32MT-LT
Rotary encoder
24V
24V DC
0V
Phase A
Phase B
Phase Z
Rotary encoder
24V
24V DC
0V
Phase A
Phase B
Phase Z
7 Examples of Wiring for Various Uses