Mitsubishi FX3U-4HSX-ADP - Function Switching] Procedures for Using 2-Phase 2-Count Input Counters C251 to C255 in 4 Edge Count Mode

FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
227
11 Use of High-speed Counters (C235 to C255)
11.11 Related Devices and Function Switching Procedures
11
High-Speed Counters
12
Output Wiring
13
Wiring for Various Uses
14
Test Run, Maintenance, Troubleshooting
15
IInput/Output Powered Extension Units
16
Input/Output Extension Blocks
17
Extension Power Supply Unit
18
Other Extension Units and Options
19
Display Module
20
Terminal Block
11.11.4 [Function switching] procedures for using 2-phase 2-count input counters C251 to
C255 in 4 edge count mode
The 2-phase 2-count input counters C251 to C255 are in the 1 edge count mode. The counters can be
operated in the 4 edge count mode by programming as shown below.
Counter No. To use 4 edge count 2-phase 2-input counter Details of change
C251
1 edge count (before change)

4 edge count (after change)
C252
C253
C253(OP)
C254
C255
M8000
M8198
C251
K
Phase A
Phase B
+1
+1
Up-counting
Phase A
Phase B
-1
-1
Down-counting
Phase A
Phase B
+1
Up-counting
+1 +1 +1 +1
+1 +1 +1 +1
Phase A
Phase B
-1
Down-counting
-1 -1 -1 -1
-1 -1 -1 -1
M8000
M8198
C252
K
M8000
M8199
C253
K
M8000
M8199
C253
M8392
M8388
K
M8000
M8198
C254
K
M8000
M8199
C255
K