Omron CP1H CPU UNITS - PROGRAMMING 05-2007, Operation Manual

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High-speed Counters
Section 5-2
• 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
5-2-2 High-speed Counter Specifications
Specifications
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.
Item Specification
Number of high-speed counters 4 (High-speed counters 0 to 3)
Pulse input modes (Selected in the PLC
Setup) Differential phase
inputs Up/down inputs Pulse + direction
inputs Increment inputs
Input terminal allocation Phase-A input Increment pulse
input Pulse input Increment pulse
input
Phase-B input Decrement pulse
input Direction input ---
Phase-Z input Reset input Reset input Reset input
Input method Differential phase,
4x
(Fixed)
Two single-phase
inputs Single-phase
pulse + direction
inputs Single-phase
input
Response
frequency X/XA
CPU
Unit Counters
0 to 3 24 VDC
inputs 50 kHz 100 kHz 100 kHz 100 kHz
Y CPU
Unit Counters
0 and 1 Line
driver
inputs 500 kHz 1 MHz 1 MHz 1 MHz
Counters
2 and 3 24 VDC
inputs 50 kHz 100 kHz 100 kHz 100 kHz
Counting mode Linear mode or circular (ring) mode (Select in the PLC Setup.)