Appendix D How to Use PLC Function|
Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 D-39
Mnemonic Function
CNT 16-bit counter
C-K
C0~C7, K0~K32,767
Operand
C-D
C0~C7, D0~D29
Explanations:
1. When the CNT command is executed from OFFÆON, which means that the counter coil
is driven, and 1 should thus be added to the counter’s value; when the counter achieved
specific set value (value of counter = the setting value), motion of the contact is as follows:
NO(Normally Open) contact Continuity
NC(Normally Closed) contact Non-continuity
2. If there is counting pulse input after counting is attained, the contacts and the counting
values will be unchanged. To re-count or to conduct the CLEAR motion, please use the
RST command.
Program Example:
Ladder diagram: Command code: Operation:
LD X0 Load contact A of X0 C2 counter
X0
C20CNT
K100
CNT C2 K100 Setting is K100
Mnemonic Function
MC / MCR Master control Start/Reset
Operand
N0~N7
Explanations:
1. MC is the main-control start command. When the MC command is executed, the
execution of commands between MC and MCR will not be interrupted. When MC
command is OFF, the motion of the commands that between MC and MCR is described
as follows:
Timer
The counting value is set back to zero, the coil and the contact
are both turned OFF
Accumulative timer
The coil is OFF, and the timer value and the contact stay at their
present condition
Subroutine timer
The counting value is back to zero. Both coil and contact are
turned OFF.
