156
FX3UC Series Programmable Controllers
User’s Manual - Hardware Edition
5 Input Specifications and External wiring
5.5 High-speed Counters (C235 to C255)
5.5.4 Related Devices (High-speed counter)
For switching 1-phase 1-count input counter mode to up-count or down-count
For monitoring the up-count/down-count counting direction of 1-phase 2-count input and 2-phase
2-count input counters
For switching high-speed counter function
Counter type Counter No. Specifying device Up-counting Down-counting
1-phase 1-count input
C235 M8235
OFF ON
C236 M8236
C237 M8237
C238 M8238
C239 M8239
C240 M8240
C241 M8241
C242 M8242
C243 M8243
C244 M8244
C245 M8245
Counter type Counter No. Monitoring device OFF ON
1-phase 2-count input
C246 M8246
Up-counting Down-counting
C247 M8247
C248 M8248
C249 M8249
C250 M8250
2-phase 2-count input
C251 M8251
C252 M8252
C253 M8253
C254 M8254
C255 M8255
Device No. Name Description Reference
M8388
Contact for
changing high-
speed counter
function
Changes the function of high-speed counter −
M8389
Function switching
devices
Switches the logic of the external reset input
Subsection
5.5.5
M8390 Switches the function of C244
Subsection
5.5.6
M8391 Switches the function of C245
Subsection
5.5.6
M8392 Switches the function of C248 and C253
Subsection
5.5.6
M8198
Device for switching C251, C252 and C254 to single or 4 edge
count
Subsection
5.5.7
M8199
Device for switching C253, C255 and C253 (OP) to single or 4 edge
count
Subsection
5.5.7
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