Function Block: Counter - Omron NE1A-SCPU01 - 2006 Operation Manual

Command Reference: Function Blocks

6-5-15 Function Block: Counter

Diagram
General Description
Input
Output Enable
Reset
Default Connections
This function can be used only in NE1A-series Controllers with unit version
1.0 or later.
The Counter function block counts the input pulses at an 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.
When the input count reaches the preset SV, the Output Enable signal is
turned ON and held ON. To detect pulses in the input signal, the input pulse's
OFF time and ON time must be longer than the cycle time.
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 set in the configuration data, 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 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.
This function block's count PV is stored in the function block's internal work
area, and can be monitored from a Programming Device.
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.
Section 6-5
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