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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.8 High-Speed Counter [C] (FX3U/FX3UC PLC)
4.8.5 Related devices
1. Devices used to switch the counting direction of 1-phase 1-count input counters
2. Devices used to check the counting direction of 1-phase 2-count input counters and
2-phase 2-count input counters
3. Devices used to switch the high-speed counter function
4. Operation status of hardware counters and software counters
*1. Cleared when the PLC mode switches from STOP to RUN.
Type Counter No. Specifying device Up-counting Down-counting
1-phase
1-counting 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
Type Counter No. Monitoring device OFF ON
1-phase
2-counting input
C246 M8246
Up-counting Down-counting
C247 M8247
C248 M8248
C249 M8249
C250 M8250
2-phase
2-counting input
C251 M8251
C252 M8252
C253 M8253
C254 M8254
C255 M8255
Device No. Name Description
M8388
Contact for changing function of
high-speed counter
Changes the function of high-speed counter.
M8389
Function switching
device
Switches the logic of the external reset input.
(For details, refer to Subsection 4.8.6.)
M8390 Switches the function of C244. (For details, refer to Subsection 4.8.7.)
M8391 Switches the function of C245. (For details, refer to Subsection 4.8.7.)
M8392
Switches the function of C248 and C253.
(For details, refer to Subsection 4.8.7.)
M8198
Switches the edge count (between 1 and 4) of C251, C252 and C254.
(For details, refer to Subsection 4.8.8.)
M8199
Switches the edge count (between 1 and 4) of C253, C255 and C253 (OP).
(For details, refer to Subsection 4.8.8.)
Device No. Name Description ON OFF
M8380
*1
Operation
status flag
Operation status of C235, C241, C244, C246, C247, C249, C251, C252 or C254
Software
counter
Hardware
M8381
*1
Operation status of C236
M8382
*1
Operation status of C237, C242 or C245
M8383
*1
Operation status of C238, C248, C248(OP), C250, C253 or C255
M8384
*1
Operation status of C239 or C243
M8385
*1
Operation status of C240
M8386
*1
Operation status of C244(OP)
M8387
*1
Operation status of C245(OP)