The Method And Cautions For Mtr Instruction - Mitsubishi FX3U Series Programming Manual

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

13.3.1 The method and cautions for MTR instruction

1. Command input
1) Setting the command input to normally ON
For 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 the 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 inputs may occur.
To prevent erroneous inputs, 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
+
3. ON/OFF duration of input signals
Because input of 64 points (8 rows × 8 columns) is received in a cycle of 80 or 160 ms, the ON/OFF duration
of each input signal should be equivalent to or more than the value shown below:
When the inputs X000 to
*1
X017 are used
80ms 80ms
*1. X000 to X007 in the FX
*2. X010 or later in the FX
326
FNC 52
X020
MTR
Power supply used for pull-up resistors
Service power supply
Power supply for driving PLC
DC24V
−
COM X000 X001 X002 X003 X004 X005 X006 X007
FX -32MT-LT
3UC
COM1 Y010 Y011 Y012 Y013 Y014 Y015 Y016 Y017
3.3kΩ/0.5W
Pull-up resistor
When the inputs X020
later are used
-16M
3U
-16M
3U
13 High Speed Processing – FNC 50 to FNC 59
Y040 M 0 K 8
-32MT-LT (sink input/sink output).
3UC
Transistor output
*2
or
160ms 160ms
13.3 FNC 52 – MTR / Input Matrix
Matrix
circuit
Refer to the
previous page.