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9.5 Instruction of Leading Edge Detection Method
9.5.1 Instructions of Leading Edge Detection Method
Instructions using the leading edge detection operation
1. DF (leading edge differential) instructions
2. Count input for CT (counter) instructions
3. Count input for F118 (UDC up-down counter) instructions
4. Shift input for SR (shift register) instructions
5. Shift input for F119 (LRSR left-right shift register) instructions
6. NSTP (next step) instructions
7. Differential execution type high-level instruction (P13)
Leading edge detection method
•
An instruction with a leading edge detection method operates only in the scan where its trigger
(execution condition) is detected switching from off to on.
(1) Standard operation
(2) Leading edge detection operation
How to perform leading edge detection
The condition of the previous execution and the condition of the current execution are compared, and the
instruction is executed only if the previous condition was off and the current condition is on. In any other
case, the instruction is not executed.
Precautions when using an instruction which performs leading edge detection
•
When RUN begins, for example when the system is powered on, the off
→
on change of the execution
condition (trigger) is not detected. The instruction is not executed. Execution of the instruction will take
place as explained on the next page.
•
When used with one of the instructions indicated in instructions 1 to 6 below which change the order of
execution of instructions, the operation of the instruction may change depending on input timing. Take
care regarding this point.
Be careful when using leading edge detection type instructions with control instructions, such
as:
1. MC and MCE instructions
2. JP and LBL instructions
3. LOOP and LBL instructions
4. CNDE instruction
5. Step ladder instructions
6. Subroutine instructions
Summary of Contents for FP E Series
Page 1: ......
Page 16: ......
Page 17: ...Chapter 1 Functions and Restrictions of the Unit ...
Page 28: ...1 12 ...
Page 29: ...Chapter 2 Specifications and Functions of the Unit ...
Page 37: ...2 9 Circuit diagram C32 Y0 Y1 Y3 Y4 C28 Y0 Y1 Y3 Y4 Y2 Y5 to YF Y2 Y5 to YB ...
Page 48: ...2 20 ...
Page 49: ...Chapter 3 Expansion ...
Page 56: ...3 8 Terminal layout diagram Note The numbers in the connector are for the first expansion ...
Page 61: ...Chapter 4 I O Allocation ...
Page 66: ...4 6 ...
Page 67: ...Chapter 5 Installation and Wiring ...
Page 90: ...5 24 ...
Page 91: ...Chapter 6 High speed counter Pulse Output and PWM Output functions ...
Page 116: ...6 26 ...
Page 121: ...6 31 ...
Page 125: ...6 35 Pulse output diagram ...
Page 131: ...6 41 ...
Page 139: ...6 49 ...
Page 141: ...6 51 ...
Page 144: ...6 54 Program Continued on the next page ...
Page 145: ...6 55 ...
Page 147: ...6 57 Program ...
Page 151: ...Chapter 7 Communication Cassette ...
Page 210: ...7 60 The values of DT50 and DT51 are written in DT0 and 1 of PLC ...
Page 238: ...7 88 ...
Page 239: ...Chapter 8 Self Diagnostic and Troubleshooting ...
Page 247: ......
Page 248: ......
Page 249: ...Chapter 9 Precautions During Programming ...
Page 260: ...9 12 Example 2 Using the CT instruction between JP and LBL instructions ...
Page 268: ...9 20 ...
Page 269: ...Chapter10 Specifications ...
Page 286: ......
Page 287: ...Chapter 11 Dimensions ...
Page 290: ...11 4 11 1 3 Expansion Unit FPG XY64D2T FPG XY64D2P FPG EM1 ...
Page 293: ...Chapter 12 Appendix ...
Page 297: ...12 5 ...
Page 437: ...12 145 12 7 ASCII Codes ...
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