Omron CP1L CPU UNIT - 03-2009, Руководство по эксплуатации

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High-speed Counters Section 5-1
5-1 High-speed Counters
5-1-1 Overview
• A rotary encoder can be connected to a built-in input to produce a high-
speed pulse input.
• The PRV(881) instruction can be used to measure the input pulse fre-
quency (one input only).
• The high-speed counter PVs can be maintained or refreshed.
• The High-speed Counter Gate Bit can be turned ON/OFF from the ladder
program to select whether the high-speed counter PVs will be maintained
or refreshed.
• Any one of the following input signals can be selected as the counter input
mode.
Response Frequencies for 24 VDC Inputs to High-speed Counters 0 and 1:
• Differential phase inputs (4x): 50 kHz
• Pulse + direction inputs: 100 kHz
• Up/Down pulse inputs: 100 kHz
• Increment pulse inputs: 100 kHz
• The counting mode can be set to linear mode or circular (ring) mode.
• The counter reset method can be set to Z phase software reset,
software reset, Z phase software reset (continue comparing), or
software reset (continue comparing).
Pulse Input Functions
Purpose Function used Description
Receive incremental rotary
encoder inputs to calculate
length or position. High-speed counter
function Built-in input terminals can be used for high-speed counter
inputs.
The PV for the high-speed counters are stored in the Auxiliary
Area.
The counters can be operated in ring mode or linear mode.
Measure a workpiece's length
or position.
(Start counting when a certain
condition is established or
pause counting when a certain
condition is established.)
High-speed Counter
Gate Bit The high-speed counter can be started or stopped (PV held)
from the Unit's program by turning ON/OFF the High-speed
Counter Gate Bit when the desired condition is met.
Measure a workpiece's speed
from its position data (frequency
measurement.) PRV(881) HIGH-
SPEED COUNTER
PV READ The PRV(881) instruction can be used to measure the pulse fre-
quency.
• Range with differential phase inputs: 0 to 50 kHz (Y models: 0
to 500 kHz)
• Range with all other input modes: 0 to 100 kHz (Y models: 0 to
1 MHz)
PRV2(883) PULSE
FREQUENCY CON-
VERT PRV2(883) reads the pulse frequency and converts it to a rota-
tional speed (r/min) or it converts the counter PV to a total num-
ber of rotations. Results are calculated by the number of pulses/
rotation.