Function Switching] Switching Of Logic Of External Reset Input Signal; Function Switching] Switching Of Allocation And Functions Of Input Terminals - Mitsubishi FX3U SERIES User Manual

FX Series Programmable Controllers
3U
User's Manual - Hardware Edition

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.
Counter No.
C241 to C245
C247 to C250
C252 to C255
Cautions in 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.
C244(OP)
C245(OP)
C248(OP)
C253(OP)
Inversion of logic of external reset input
signal
M8388
M8389
C253
K
When used as hardware counter
M8388
M8390
C244
K
M8388
M8391
C245
K
M8388
M8392
C248
K
M8388
M8392
C253
K
11 Use of High-speed Counters (C235 to C255)
11.11 Related Devices and Function Switching Procedures
Details of change
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.)
Details of change
• 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.
• 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.
• Reset input is not given.
• The counter functions as a hardware counter.
• Reset input is not given.
• The counter functions as a software counter.
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