X8 Instruction Set Reference Manual
5-24
Using the High-Speed Counter and Programmable Limit Switch
The HowPresetReached flag is set when the HSC accumulator value is less
than or equal to the high preset.
This bit is updated continuously by the HSC s whenever the PLC is in a run
mode.
UnderFlowInterrupt
The UnderFlowInterrupt flag is set when the HSC accumulator reaches to the
Underflow value and the HSC interrupt is triggered.
This bit can be used in the control program to identify that the underflow
condition caused the HSC interrupt and applied to the logic of the control
program.
This flag can be cleared by the control program and is also cleared by the HSC
whenever these conditions are detected:
• Low Preset Interrupt executes
• High Preset Interrupt executes
• Overflow Interrupt executes
• PLC enters an executing mode
OverFlowInterrupt
The OverflowInterrupt flag is set when the HSC accumulator reaches to the
Overflow value and the HSC interrupt is triggered.
This bit can be used in the control program to identify that the Overflow
condition caused the HSC interrupt and applied to the logic of the control
program.
This flag can be cleared by the control program and is also cleared by the HSC
whenever these conditions are detected:
• Low Preset Interrupt executes
• High Preset Interrupt executes
Description
Data Format
HSC Mode
Function
User Program
Access
HSC:0.UnderFlowInterrupt
Bit
2~9
Status
Read Only
Description
Data Format
HSC Mode
Function
User Program
Access
HSC:0.OverFlowInterrupt
Bit
2~9
Status
Read Only
Summary of Contents for X8 Series
Page 1: ...Catalog Number s X8 M14DDT X8 M16DDR X8 M32DDT X8 Instruction Manual Reference Manual ...
Page 16: ......
Page 64: ...X8 Instruction Set Reference Manual 2 12 X8 Series PLC Memory and Data Table ...
Page 166: ...X8 Instruction Set Reference Manual 7 8 Relay Type Bit Instructions ...
Page 180: ...X8 Instruction Set Reference Manual 8 14 Timer and Counter Instructions ...
Page 205: ...X8 Instruction Set Reference Manual Math Instructions 10 17 ...
Page 206: ...X8 Instruction Set Reference Manual 10 18 Math Instructions ...
Page 212: ...X8 Instruction Set Reference Manual 11 6 Converion Instructions ...
Page 218: ...X8 Instruction Set Reference Manual 12 6 Logical Instructions ...
Page 236: ...X8 Instruction Set Reference Manual 15 8 Shift and FIFO LIFO Instructions ...
Page 242: ...X8 Instruction Set Reference Manual 16 6 Sequencing Instructions ...
Page 252: ...X8 Instruction Set Reference Manual 18 4 Input and Output Instructions ...
Page 280: ...X8 Instruction Set Reference Manual 20 12 PID Control ...
Page 296: ...X8 Instruction Set Reference Manual 21 16 ASCII Instructions ...
Page 308: ...X8 Instruction Set Reference Manual 22 12 Communications Instructions ...
Page 312: ...Appendix A 4 System Error Code ...
Page 313: ...Appendix B MSG Instruction Error Code MSG Instruction Error Code ...
Page 322: ...Appendix B 10 MSG Instruction Error Code ...
Page 325: ...ASCII Character Set Appendix C 3 ...
Page 326: ...Publication number X8 RM001A EN September 2012 ...
Page 327: ...Copyright 2012 RS Automation Co Ltd All rights reserved ...