Precautions
• Counter numbers are shared by the CNT, CNTX(546), CNTR(012), CNTRX(548), CNTW(814), and CNTWX(818) instructions. If two counters share the same counter number but are not used simultaneously, a duplication error will be generated when the program is checked but the counters will operate normally. Counters which share the same counter number will not operate properly if they are used simultaneously.
• A counter's PV is refreshed when the count input goes from OFF to ON and the Completion Flag is refreshed each time that CNT/CNTX(546) is executed. The Completion Flag is turned ON if the PV is 0 and it is turned OFF if the PV is not 0.
• When a CNT/CNTX(546) counter is forced set, its Completion Flag will be turned ON and its PV will be reset to 0000. When a CNT/CNTX(546) counter is forced reset, its Completion Flag will be turned OFF and its PV will be set to the SV.
• Be sure to reset the counter by turning the reset input from OFF ® ON ® OFF before beginning counting with the count input, as shown in the following diagram. The count input will not be received if the reset input is ON.