Input Filter Adjustment [D8020] - Mitsubishi Electric FX3G SERIES Programming Manual

Programmable controllers

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Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

Input filter adjustment [D8020]

The inputs X000 to X017

set between 0 to 60

automatically set to K10 (10 ms).

X000 to X007 in the FX

0 to 15 in FX

1. Program example for adjusting the input filter

When the program shown below is executed, the filter constant is changed to 0 ms.

Because the C-R filter is provided in the hardware, however, the filter constant is shown in the table below when "0" is

Input number

X000 to X005

X010 to X017

Input number

X000, X001, X003, X004

X002, X005, X006, X007

When setting the input filter to "5 μs" or when receiving pulses whose response frequency is 50 k to 100 kHz

using high-speed counters, perform the following actions:

Input wiring length should be 5 m (16' 4") or less.

Connect a bleeder resistor (1.5 kΩ, 1/2 W) to the input terminal. The load current of the open collector

transistor output in the device on the other end should be 20 mA or more including the input current of the

• The input filter constant can be changed as many times as need in the user program.

• This input filter adjustment described here is not required when using high-speed counter, input interrupt, or pulse

catch (M8170 to M8175) functions.

have a digital filter circuit with a setting range of 0 to 60 ms. The digital filter setting value is

ms (in 1 ms steps) in special data register D8020. After the PLC powers ON, D8020 is

Determined by the contents of D8020 (initial value: 10)

Input refresh

Input filter value when "0" is set

-16M , only X000 to X007 support the input filter adjustment function.

37 Operation of Special Devices (M8000 -, D8000 -)

37.2 Supplement of Special Devices (M8000 - and D8000 -)

Fx3u series Fx3uc series