218
High-speed Counters
Section 7-1
7-1
High-speed Counters
7-1-1
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
• Range with all other input modes: 0 to 100 kHz
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.
Summary of Contents for CP1L-EL20DR-D
Page 3: ...CP1L EL20D CP1L EM30D CP1L EM40D CP1L EL EM CPU Unit Operation Manual Produced July 2017...
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Page 22: ...xxii...
Page 34: ...xxxiv Software Licenses and Copyrights 7...
Page 192: ...158 Trial Operation and Debugging Section 5 3...
Page 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Page 666: ...632 Trouble Shooting Section 11 7...
Page 696: ...662 Standard Models Appendix A...
Page 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Page 836: ...802 PLC Setup Appendix G...
Page 838: ...804 TCP Status Transitions Appendix H...
Page 840: ...806 Ethernet Network Parameters Appendix I...
Page 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Page 844: ...810 Ethernet Specifications Appendix K...
Page 851: ...Index 817 work words 118 write protection 447...
Page 852: ...818 Index...
Page 854: ...820 Revision History...
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