DVP-ES2-EX2-SS2-SA2-SX2-Operation Manual

3. Instruction Set
Change target freq.
Freq.
Actual timing of changing
Gap freq.
Gap
time
Gap
time
Delayed by program scan cycle
Time
2. If users change the target frequency by applying DICF instruction in insterupt subroutines, the
actual changing timing will be executed immediately with only an approx. 10us delay
(execution time of DICF instruction).
The timing diagram is as below:
Interrupt
Actual timing of changing
Freq.
Gap freq.
Gap
time
Gap
time
Time
approx.10us
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 X6 external interrupt executes, target frequency is changed and ramp 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 X7 external interrupt executes, target frequency is changed and ramp down to 100Hz
immediately. Total shifts: 25, Gap frequency: 2000Hz, Gap time: 100ms. Calculation of total
shifts: (50,000 -100) ÷ 2000 = 25.
4. When pulse output reaches 100Hz, the frequency is kept constant and pulse output stops
when 1,000,000 pulses is completed.
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