9-9
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
Содержание FP E Series
Страница 1: ......
Страница 16: ......
Страница 17: ...Chapter 1 Functions and Restrictions of the Unit ...
Страница 28: ...1 12 ...
Страница 29: ...Chapter 2 Specifications and Functions of the Unit ...
Страница 37: ...2 9 Circuit diagram C32 Y0 Y1 Y3 Y4 C28 Y0 Y1 Y3 Y4 Y2 Y5 to YF Y2 Y5 to YB ...
Страница 48: ...2 20 ...
Страница 49: ...Chapter 3 Expansion ...
Страница 56: ...3 8 Terminal layout diagram Note The numbers in the connector are for the first expansion ...
Страница 61: ...Chapter 4 I O Allocation ...
Страница 66: ...4 6 ...
Страница 67: ...Chapter 5 Installation and Wiring ...
Страница 90: ...5 24 ...
Страница 91: ...Chapter 6 High speed counter Pulse Output and PWM Output functions ...
Страница 116: ...6 26 ...
Страница 121: ...6 31 ...
Страница 125: ...6 35 Pulse output diagram ...
Страница 131: ...6 41 ...
Страница 139: ...6 49 ...
Страница 141: ...6 51 ...
Страница 144: ...6 54 Program Continued on the next page ...
Страница 145: ...6 55 ...
Страница 147: ...6 57 Program ...
Страница 151: ...Chapter 7 Communication Cassette ...
Страница 202: ...7 52 Procedure of communication In the following example the Micro Imagechecker is connected to COM1 port ...
Страница 210: ...7 60 The values of DT50 and DT51 are written in DT0 and 1 of PLC ...
Страница 238: ...7 88 ...
Страница 239: ...Chapter 8 Self Diagnostic and Troubleshooting ...
Страница 247: ......
Страница 248: ......
Страница 249: ...Chapter 9 Precautions During Programming ...
Страница 260: ...9 12 Example 2 Using the CT instruction between JP and LBL instructions ...
Страница 268: ...9 20 ...
Страница 269: ...Chapter10 Specifications ...
Страница 286: ......
Страница 287: ...Chapter 11 Dimensions ...
Страница 290: ...11 4 11 1 3 Expansion Unit FPG XY64D2T FPG XY64D2P FPG EM1 ...
Страница 293: ...Chapter 12 Appendix ...
Страница 297: ...12 5 ...
Страница 437: ...12 145 12 7 ASCII Codes ...
Страница 439: ......
Страница 440: ......