Eaton ELC-PB, Руководство по программированию

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3-490
Freq.
Time
Gap freq.
Delayed by program scan cycle
Gap
time Gap
time
Change target freq.
Actual timing of changing
2. If the target frequency is changed with the DICF instruction in an interrupt subroutine, the
change will be executed immediately with an approximate delay of 10us (the execution time of
the DICF instruction).
The timing diagram is as below:
Freq.
Time
Gap freq.
approx.10us
Gap
time
Gap
time
Interrupt
Actual timing of changing
Program Example:
1. When M0 = ON, pulse output ramps up to 100kHz. Total shifts: 100, Gap frequency: 1000Hz,
Gap time: 10ms. Calculation of total shifts: (100,000
﹣
0) ÷ 1000 = 100.
2. When the X6 external interrupt executes, the target frequency is changed and is ramped down
to 50kHz immediately. Total shifts: 150, Gap frequency: 800Hz, Gap time: 20ms. Calculation of
total shifts: (100,000
﹣
50,000) ÷ 800 = 125
3. When the X7 external interrupt executes, the target frequency is changed and is ramped down
to 100Hz immediately. Total shifts: 25, Gap frequency: 2000Hz, Gap time: 100ms. Calculation
of total shifts: (50,000
﹣
100) ÷ 2000 = 25.
4. When the pulse output reaches 100Hz, the frequency is kept constant and the pulse output
stops when 1,000,000 pulses are completed.