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FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
11 Use of High-speed Counters (C235 to C255)
11.11 Related Devices and Function Switching Procedures
11.11.2 [Function switching] switching of logic of external reset input signal
The external reset input for the counters C241 to C245, C247 to C250 and C252 to C255 resets the counters
when it is turned ON. If the logic is inverted by the following program, the counters can be reset by turning
OFF the input.
Cautions on inverting the logic of the external reset input signal
Although C253 is a hardware counter, it is switched to a software counter by inverting the logic of the external
reset input signal.
11.11.3 [Function switching] switching of allocation and functions of input terminals
When the software counters C244, C245, C248 and C253 are combined with the following special auxiliary
relays, the allocation of the input terminals and functions are changed.
Program the special auxiliary relays just before the counters.
Counter No.
Inversion of logic of external reset input
signal
Details of change
C241 to C245
C247 to C250
C252 to C255
The logic of external reset input is inverted to
reset the counters when the input is turned OFF.
(The logic for all applicable counter numbers is
inverted.)
Counter No. Function switching method Details of change
C244(OP)
• The count input terminal is changed from X000 to
X006.
• Reset input is not given.
• Start input is not given.
• The counter functions as a hardware counter.
C245(OP)
• The count input terminal is changed from X002 to
X007.
• Reset input is not given.
• Start input is not given.
• The counter functions as a hardware counter.
C248(OP)
• Reset input is not given.
• The counter functions as a hardware counter.
C253(OP)
• Reset input is not given.
• The counter functions as a software counter.
M8388
M8389
C253
K
M8388
M8390
C244
K
M8388
M8391
C245
K
M8388
M8392
C248
K
M8388
M8392
C253
K
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