FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
201
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 Related Devices and Function Switching Procedures
11.11.1 Related devices
1. For switching 1-phase 1-count input counter mode to up-count or down-count
2. For monitoring of up-count/down-count counting direction of 1-phase 2-count input and 2-
phase 2-count input counters
3. 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
Counter
type
Counter
No.
Monitoring
device
OFF ON
1-phase
2-count
input
C246 M8246
Up-
counting
Down-
counting
2-phase
2-count
input
C251 M8251
Up-
counting
Down-
counting
C247 M8247 C252 M8252
C248 M8248 C253 M8253
C249 M8249 C254 M8254
C250 M8250 C255 M8255
Device No. Name Description Reference
M8388
Contact for
changing high-
speed counter
function
Contact for changing the high-speed counter function −
M8389
Function switching
devices
Switching of logic of external reset input
Subsection
11.11.2
M8390 Function switching device for C244
Subsection
11.11.3
M8391 Function switching device for C245
Subsection
11.11.3
M8392 Function switching device for C248 and 253
Subsection
11.11.3
M8198
Device for switching C251, C252 and C254 to single or 4 edge
count
Subsection
11.11.4
M8199
Device for switching C253, C255 and C253 (OP) to single or 4 edge
count
Subsection
11.11.4
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