Operation And Cautions For Mtr Instruction - Mitsubishi Electric MELSEC FX3U Programming Manual

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

13.3.1 Operation and cautions for MTR instruction

1. Command input
1) Setting the command input to normally ON
For the MTR instruction, set the command input to normally ON.
M
(normally ON)
2. Input numbers used in MTR instruction
1) Inputs available in MTR instruction
Use inputs X020 and later under normal conditions.
2) When using the inputs X000 to X017
The receiving speed is higher. Because the output transistor recovery time is long and the input
sensitivity is high, however, erroneous input pulses may be counted.
To prevent erroneous input pulses, connect pull-up resistors (3.3 kΩ/0.5 W) to transistor outputs used in
MTR instruction.
For pull-up resistors, use the power supply shown in the table below.
AC power type PLC
DC power type PLC
The figure below shows an example of the FX
24V
*1. X000 to X007 in the FX
3. ON/OFF duration of input signals
Because 64 input points (8 rows × 8 columns) are received in a cycle of 80 or 160 ms, the ON/OFF duration
of each input signal should be greater than or equal to the value shown below:
When inputs X000 to
*1
X017 are used
80ms 80ms
*1. X000 to X007 in the FX
*2. X010 and later in the FX
364
FNC 52
X020 Y040
MTR
*1
Power supply used for pull-up resistors
Service power supply
Power supply for driving PLC
S/S 0V X000 X001 X002 X003 X004 X005 X006 X007
FX -64MT-ES
3U
COM5 Y020 Y021 Y022 Y023 Y024 Y025 Y026 Y027
3.3kΩ/0.5W
Pull-up resistor
, FX -16M
3G 3U
When inputs X020
later are used
, FX -16M
3G 3U
, FX -16M
3G 3U
13 High Speed Processing – FNC 50 to FNC 59
M 0 K 8
Series main unit (sink input/sink output).
3U
Transistor output
and FX -16M .
3UC
*2
or
160ms 160ms
and FX -16M .
3UC
and FX -16M .
3UC
13.3 FNC 52 – MTR / Input Matrix
Matrix
circuit
Refer to the
previous page.