Mitsubishi FX3UC SERIES User Manual page 165

FX Series Programmable Controllers
3UC
User's Manual - Hardware Edition
5.5.7 [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 normally set to 1 edge count mode. The counters can
be operated in 4 edge count mode through programming as shown below.
Counter No.
C251
C252
C253
C253(OP)
C254
C255
To use 4 edge count 2-phase 2-input counter
M8000
M8198
C251
M8000
M8198
C252
M8000
M8199
C253
M8000
M8199
M8388
M8392
C253
M8000
M8198
C254
M8000
M8199
C255
5 Input Specifications and External wiring
5.5 High-speed Counters (C235 to C255)
1 edge count (before change)
Phase A
K
Phase B
Phase A
K
Phase B
K
4 edge count (after change)
Phase A
K Phase B
Phase A
K
Phase B
K
Details of change
+1 +1
Up-counting
-1 -1
Down-counting
+1 +1 +1 +1 +1
+1 +1 +1 +1
Up-counting
-1 -1 -1 -1 -1
-1 -1 -1 -1
Down-counting
159
1
2
3
4
5
6
7
8
9
10