LG MASTER-K 120S Series User Manual page 95

Chapter 7 Usage of Various Functions
(6) RPM setting
- Can calculates RPM of input pulse
- RPM is stored in designated device.
- The RPM is expressed as:
=
RPM
(a) Examples of Program
- Refresh cycle : 1000ms, Pulses per rotate : 60, RPM save area : D0
Input pulse
Current value
D0, D1
Time
ⓐ Last value = 500(Assumption), Current value = 1000
RPM = { (1000 – 500) * 60,000} / {60 * 1000} = 500
ⓑ Last value = 1000, Current value = 2000
RPM = { (2000 – 1000) * 60,000} / {60 * 1000} = 1000
ⓒ Last value = 2000, Current value = 4000
RPM = { (4000 – 2000) * 60,000} / {60 * 1000} = 2000
(Current Value - Last Value)
×
Pulses per rotate refresh
×
60,000
cycle[ms]
1000 2000
ⓐ 500
2000ms
1000ms
7-11
2001 4000
ⓑ 1000 ⓒ 2000
3000ms