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FX Series Programmable Controllers Devices in Detail 4
4-25
If any high speed comparison instructions (FNC’s 53, 54, 55) are used, X0 and X1 must resort
to software counting. In this case, please see the table below:
Unit
Function
Number
Max. Combined
Signal Frequency
FX
2N & FX2NC
53 or 54 11 kHz
55 5.5 kHz
FX
1S & FX1N 53 or 54 30 kHz
Calculating the maximum combined counting speed on FX1S:
This is calculated as follows:
(2 phase counter speed
x number of counted edges)
✚
(the sum of the speeds of the active 1 phase counters).