Overview (Sequence Program); Introduction Of Convenient Functions; Convenient Functions For Input Processing - Mitsubishi Electric FX3G SERIES Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2.

Overview (Sequence Program)

This chapter explains the basic functions of FX
This chapter includes not only the features of PLCs but also introduction of representative functions, parameters and
memory to utilize the functions of PLCs. Read this chapter before designing sequences.
2.1

Introduction of Convenient Functions

FX /FX /FX
3G 3U 3UC
2.1.1

Convenient functions for input processing

1. "High-speed counter" function of one phase or two phases for counting high-speed inputs
One-phase high-speed counters can execute counting at up to 100 kHz (or 200 kHz when a special high-speed input
*2
adapter is used) in FX
process high-speed pulses from specific input relays as interrupts.
(Two-phase high-speed counters can execute counting at up to 50 kHz (or 100 kHz when a special high-speed input
*2
adapter is used) in FX
The counting result can be immediately handled as high-speed counter output interrupts by specific program
processing and high-speed counter counted values by comparison instructions dedicated to high-speed counters.
*1. This function is supported only for DC input type.
*2. Can only be connected to the FX
If the number of high-speed counters is insufficient, special extension equipment (high-speed counter
blocks) can be connected.
By extending hardware counters in the high-speed counter block
received (except 2 and 4 edge count).
*3. Can only be connected to the FX
2. "I/O refresh" function for receiving the latest input information
The input terminal information of the PLC in the batch refresh method is input all at once by the input image memory
before step 0. The output information is output at one time when END instruction is executed.
I/O refresh instruction can get the latest input information and immediately output the operation result during sequence
operation.
3. "Input filter adjustment" function for changing the time constant of input relays
Input relays in the PLC are equipped with a C-R filter of approximately 10 ms as countermeasures against chattering
and noise in input signals. Because a digital filter is adopted for the input relays X000 to X017
value can be changed in sequence programs.
*4. This function is supported only for DC input type.
*5. X000 to X007 in the FX
4. "Pulse catch" function
The pulse catch function is provided as a method to receive short-time pulse signals.
The pulse catch function monitors signals from specific input relays, and sets special auxiliary relays in the interrupt
processing as soon as signals are input.
The pulse catch function can be used in a wide range of applications because even narrow pulses can be easily
received.
When complicated operations should be processed with high priority as interrupt by using specific trigger signals, the
"interrupt" function described later is suitable.
*6. This function is supported only for DC input type.
3G
PLCs have the following instruction functions.
/FX PLCs and up to 60 kHz in FX
3U 3UC
/FX PLCs and up to 30 kHz in FX
3U 3UC
PLC.
3U
→ Related instructions: High-speed counter compare; HSCS (FNC 53), HSCR (FNC 54),
/FX
3U 3UC
, FX -16M and FX
3G 3U
→ Related instruction: Refresh and filter adjust instruction REFF (FNC 51)
*6
2.1 Introduction of Convenient Functions
/FX /FX PLCs.
3U 3UC
PLCs regardless of the operation time because they
3G
PLCs.)
3G
*3
, high-speed pulses at up to 200 kHz can be
PLC.
→ FX
→ Related instruction: Refresh REF (FNC 50)
-16M .
3UC
2 Overview (Sequence Program)
HSZ (FNC 55) and HSCT (FNC 280)
-2HC high-speed counter block
3U
*4
*5
, however, the filter
→ Refer to Section 36.7.
1
2
3
*1
4
5
6
7
8
9
10
25