Counter Unit Ver. 1.0 Or Later - Omron NE1A-SCPU01 - 07-2009 Operation Manual

Command Reference: Function Blocks
8-5-15 Counter
Diagram
General Description
198
Unit Ver. 1.0 or Later
Input
Reset
Default
This function can be used with Controllers with unit version 1.0 or later
(including Controllers that support EtherNet/IP).
The Counter function block counts the input pulses at Input and turns ON the
Output Enable signal when the count reaches a set value (SV) set with the
Network Configurator. The function counts the number of OFF-to-ON transi-
tions in the input signal.
To detect pulses in the input signal, the input pulse's OFF time and ON time
must be longer than the cycle time.
■ Counting Methods (Count Type)
The Count Type can be set to Down counter or Up counter (decrementing or
incrementing counter).
With a Down (decrementing) counter, the preset SV is the counter's initial
value and the counter decrements the count by 1 each time that an input
pulse is detected. The Output Enable signal is turned ON when the count
reaches 0.
With an Up (incrementing) counter, the counter's initial value is 0 and the
counter increments the count by 1 each time that an input pulse is detected.
The Output Enable signal is turned ON when the count reaches the preset SV.
The count value (present value) is saved in the function block work area and
can be monitored from the Network Configurator.
■ Reset Methods (Reset Condition)
The Reset Condition used to reset the input count (PV) can be set to Manual
Reset or Auto Reset.
When the reset condition is set to Auto Reset and the input count reaches the
SV, the Output Enable signal is turned ON and remains ON as long as the
input signal is ON. When the input signal goes OFF, the input count is reset.
When the reset condition is set to Manual Reset, the input count is reset and
the Output Enable signal is turned OFF when the Reset signal goes ON. Input
pulses will not be counted while the Reset signal is ON. Counting will be con-
tinued when the Reset signals turns OFF.
Output Enable
Section 8-5