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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
13 High Speed Processing – FNC 50 to FNC 59
13.3 FNC 52 – MTR / Input Matrix
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.
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
*1
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.
The figure below shows an example of the FX
3U Series main unit (sink input/sink output).
*1. X000 to X007 in the FX
3G, FX3U-16M and FX3UC-16M.
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:
*1. X000 to X007 in the FX
3G, FX3U-16M and FX3UC-16M.
*2. X010 and later in the FX
3G, FX3U-16M and FX3UC-16M.
Power supply used for pull-up resistors
AC power type PLC Service power supply
DC power type PLC Power supply for driving PLC
M
{{
(normally ON)
FNC 52
MTR
X020 Y040 M 0 K 8
COM5 Y020 Y021 Y022 Y023 Y024 Y025 Y026 Y027
0V X000 X001 X002 X003 X004 X005 X006 X007
Matrix
circuit
3.3k
Ω
/0.5W
FX
3U
-64MT-ES
Transistor output
Pull-up resistor
Refer to the
previous page.
24V
S/S
80ms 80ms
When inputs X000 to
X017
*1
are used
160ms 160ms
When inputs X020
*2
or
later are used