235
High-speed Counters
Section 7-1
When the High-speed Counter Gate Bit is turned OFF again, the high-speed
counter will resume counting and the counter PV will be refreshed.
Restrictions
• The Gate Bit will be disabled if the high-speed counter's reset method is
set to Phase-Z Software reset and the Reset Bit is ON (waiting
for the phase-Z input to reset the counter PV.)
High-speed Counter Frequency Measurement
This function measures the frequency of the high-speed counter (input
pulses.)
The input pulse frequency can be read by executing the PRV(881) instruction.
The measured frequency is output in 8-digit hexadecimal and expressed in
Hz. The frequency measurement function can be used with high-speed
counter 0 only.
The frequency can be measured while a high-speed counter 0 comparison
operation is in progress. Frequency measurement can be performed at the
same time as functions such as the high-speed counter and pulse output with-
out affecting the performance of those functions.
Procedure
1,2,3...
1.
High-speed Counter Enable/Disable Setting (Required)
Select the Use high speed counter 0 Option in the PLC Setup.
2.
Pulse Input Mode Setting (Required)
Set the High-speed Counter 0 Pulse Input Mode (Input Setting) in the PLC
Setup.
3.
Counting Mode Setting (Required)
Set the High-speed Counter 0 Counting Mode in the PLC Setup.
If ring mode counting is selected, set the High-speed Counter 0 Circular
Max. Count (max. ring count) in the PLC Setup.
4.
Reset Method Setting (Required)
Set the High-speed Counter 0 Reset Method in the PLC Setup.
5.
PRV(881) Instruction Execution (Required)
N: Specify the high-speed counter number. (High-speed counter 0: 0010)
C: 0003 (Read frequency)
D: Destination word for frequency data
Restrictions
• The frequency measurement function can be used with high-speed
counter 0 only.
Specifications
Item
Specifications
Number of frequency
measurement inputs
1 input (high-speed counter 0 only)
Frequency measurement
range
High-speed counter 0:
Differential phase inputs: 0 to 50 kHz
All other input modes: 0 to 100 kHz
Note:
If the frequency exceeds the maximum value, the
maximum value will be stored.
Measurement method
Execution of the PRV(881) instruction
Output data range
Units: Hz
Range:
Differential phase input: 0000 0000 to 0003 0D40 hex
All other input modes: 0000 0000 to 0001 86A0 hex
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...
Page 4: ...iv...
Page 10: ...x...
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...
Page 855: ......