Omron RX Series User Manual page 449

Analog input value
Frequency reference
Precautions for Correct Use Precautions for Correct Use
• If you switch the control via the terminal SET/SET3 (C001 to C008 = 08/17) with the terminal
AHD ON, the set frequency remains "as is." To switch the control function, turn OFF the
terminal AHD and have the inverter hold the signal again.
• Frequent use of this function could shorten the life expectancy of the internal storage element.
Multi-function Pulse Counter (PCNT, PCC)
• Use this function to capture pulses from a pulse train input via one of the multi-function input
terminals.
• You can monitor the captured pulses as the total count in the Pulse Counter Monitor (d028).
• To use this function, set the Multi-function Input S1 to S8 Selection (C001 to C008) to 74 (PCNT) or
75 (PCC).
• The total count value cannot be stored. It will be reset to zero when the power supply is turned off and
then on again or when the inverter is reset.
• To clear the total count value, turn ON the terminal to which PCC (pulse counter clear) is allocated.
Parameter No.
C001 to C008
Related functions
• The resolution of the input pulse frequency can be obtained from the formula shown below. Note,
however, that this applies to pulse input with a duty ratio of 50%.
The inverter cannot capture input pulses at frequencies higher than the specified resolution. It is
recommended that you use a frequency resolution of 100 Hz or less.
For details on input terminal response, refer to Input Terminal Response Time on page 7-140.
(Example) Input terminal response time = 1, Frequency resolution = 125 Hz
Frequency resolution [Hz] = 250/(Input terminal response time set values C160 to C168 + 1)
Input pulse
PCNT
Counter
value
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
AHD terminal
Function name
74: PCNT (Pulse counter)
Multi-function Input S1
to S8 Selection
75: PCC (Pulse counter clear)
d028
Input terminal response time
ON
OFF
1
ON
Data
2
Input pulses are too short and cannot
be captured during this period.
7 Detailed Functions
Default data Unit
– –
3 4
7 - 123
7