Mitsubishi FX3U Series Programming Manual

110
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.7 High-Speed Counter [C] (FX3U/FX3UC PLC)
4.7.8 How to use 2-phase 2-count input counters C251 to C255 with
4 edge counting
For the 2-phase 2-count input counters C251 to C255, the edge count is usually set to 1. By using the programs
shown in the table below, the edge count may be set to 4.
Counter No.
When using 2-phase 2-count input counters with 4 edge
counting
Description
C251
1 edge count (before change)
↓
4 edge count (after change)
C252
C253
C253(OP)
C254
C255
M8000
M8198
C251
K {{{
A phase
B phase
+1
+1
Up-counting
A phase
B phase
− 1
− 1
Down-counting
A phase
B phase
+1
Up-counting
+1 +1 +1 +1
+1 +1 +1 +1
A phase
B phase
− 1
Down-counting
− 1 − 1 − 1 − 1
− 1 − 1 − 1 − 1
M8000
M8198
C252
K {{{
M8000
M8199
C253
K {{{
M8388
M8199
C253
K
{{{
M8392
M8000
M8000
M8198
C254
K {{{
M8000
M8199
C255
K {{{

Mitsubishi FX3U Series Specifications

General

Model	FX3U Series
Program Memory	64k steps
Execution Speed	0.065 μs/basic instruction
Type	PLC (Programmable Logic Controller)
Power Supply	100-240V AC
I/O Points	Up to 384
Communication	USB
Expansion	Supported via expansion modules
High-Speed Counters	Up to 6 channels
Analog Input/Output	Available via expansion modules
Temperature Range	0 to 55°C
Programming Language	Ladder Logic, Structured Text
Built-in Functions	PID control
Humidity	5 to 95% (non-condensing)