Mitsubishi Electric MELSEC FX3U Programming Manual page 858

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
4. Number and operation of (six) interrupt pointers
I 0
0: Interrupt at falling edge, 1: Interrupt at rising edge
0 to 5 according to the inputs X000 to X005
Input number
X000
X001
X002
X003
X004
X005
*1. Cleared when the PLC mode is changed from RUN to STOP.
5. How to disable each interrupt input
When either one among M8050 to M8055 is set to ON in a program, interrupts from the corresponding input
number are disabled.
(Refer to the above table for the correspondence.)
6. Cautions
1) Do not use an input two or more times
Make sure that an input relay number used as an interrupt pointer is not used in high speed counters,
pulse catch functions and applied instructions such as FNC 56 (speed detection) which use the same
input range.
2) Automatic adjustment of the input filter
When an input interrupt pointer I 0
changed to the input filter for high speed receiving.
Accordingly, it is not necessary to change the filter value using REFF (FNC 51) instruction or special data
register D8020 (input filter adjustment).
The input filter of an input relay not being used as an input interrupt pointer operates at 10 ms (initial
value).
3) Pulse width of input interrupt
For executing input interrupt by an external signal, it is necessary to input the ON or OFF signal having
the duration shown in the table below or more.
PLC
FX , FX
3U
FX
When using the input filter at the filter value of 5 µs or when receiving a pulse whose response
*1.
frequency is 50 k to 100 kHz using a high speed counter, perform the following:
-Make sure that the wiring length is 5 m or less.
-Connect a bleeder resistor of 1.5 kΩ (1 W or more) to an input terminal, and make sure that the
load current of the open collector transistor output in the counterpart equipment is 20 mA or
more including the input current in the main unit.
4) Using a pointer number two or more times
It is not possible to program an interrupt at the rising edge and an interrupt at the falling edge for an input
such as I001 or I000.
856
Interrupt at rising edge
I001
I101
I201
I301
I401
I501
Input number
X000 to X005
3UC
X000,X001,X003,X004
3G
X002,X005
36 Interrupt Function and Pulse Catch Function
36.3 Input Interrupt (Interrupt Triggered by External Signal) [Without Delay Function]
Pointer number
Interrupt at falling edge
I000
I100
I200
I300
I400
I500
is specified, the input filter of the input relay is automatically
Input filter value when "0" is set
Interrupt disable command
M8050
M8051
M8052
M8053
M8054
M8055
*1
5µs
10µs
50µs
*1
*1
*1
*1
*1
*1