Maple Systems MAPware-7000 - Manual (Page 132)

MAPware-7000 Ladder Logic Guide 124
1010-1041 rev. 00
Note:
No transitional contact is required for the count
input. The count input rising edge is detected by
this instruction.
For the count input, direct linking to a
connecting point is not allowed. In this case,
insert a dummy contact (always ON = S04F, etc.)
just before the input.
Refer to Note of Shift register FUN 074.
Multiple counter instructions (CNT) with the
same counter register are not allowed.