Mitsubishi Electric MELSEC-L Series User Manual (English)

Other manuals for Mitsubishi Electric MELSEC-L Series

Questions and Answers:

B
Brittany PriceAug 16, 2025
What to do if a Mitsubishi Electric I/O Systems signal incorrectly inputs data?
- C
  christy75Aug 16, 2025
  If a Mitsubishi Electric I/O Systems signal incorrectly inputs data, it might be due to noise. Try setting the input response time longer, for example, from 1ms to 5ms. If this doesn't work, avoid installing power cables together with I/O cables to prevent excessive noise. Also, connect surge absorbers to noise-generating devices like relays and conductors using the same power supply, or take other noise reduction measures.
P
Paula BakerAug 18, 2025
Why my Mitsubishi Electric I/O Systems input signal does not turn off?
- N
  Natalie GillespieAug 18, 2025
  If a Mitsubishi Electric I/O Systems input signal does not turn off, it could be due to a leakage current from an input switch. To resolve this, connect an appropriate resistor so that the voltage across the terminals of the input module is lower than the OFF voltage. This applies if the drive is by a contactless switch, a limit switch with neon lamp, or due to the line capacity of a wiring cable. If the issue is caused by using two power supplies creating a sneak path, use only one power supply or connect a diode to prevent the sneak path.
J
Jacqueline McdowellAug 21, 2025
Why does another load turn on when I turn on an output on my Mitsubishi Electric I/O Systems?
- A
  Anna McdowellAug 22, 2025
  If, when turning on one output on your Mitsubishi Electric I/O Systems transistor output (source type), a load connected to another output also turns on, it's possible that the wire connecting 0V of an external power supply and a common of a load is cut off or disconnected. This can cause current to flow to the load that is off due to a parasitic circuit of the output element that is off. Ensure the external power supply and loads are correctly connected. To prevent this, connect a diode to each output terminal.
S
Steven GutierrezAug 25, 2025
What to do if Mitsubishi Electric I/O Systems load does not turn off (triac output)?
- E
  Emily WallerAug 26, 2025
  If the load on your Mitsubishi Electric I/O Systems triac output does not turn off, it's likely due to a leakage current caused by a built-in surge suppressor. To fix this, connect a resistor across the load.
A
Alyssa RichardsonAug 28, 2025
Why does my Mitsubishi Electric I/O Systems load momentarily turn on when the system is powered off (transistor output)?
- S
  sonyasanchezAug 28, 2025
  If a Mitsubishi Electric I/O Systems load momentarily turns on from off when the system is powered off (transistor output), it may be due to a diversion of back EMF at shutoff when an inductive load is connected. To address this, connect a diode in parallel to the load where back EMF is generated to suppress it.
J
Jessica BishopAug 31, 2025
Why does my Mitsubishi Electric I/O Systems load operate when powering on the external power supply (transistor output)?
- A
  Ann KingAug 31, 2025
  If the load on your Mitsubishi Electric I/O Systems operates when powering on the external power supply (transistor output), it indicates that the polarity of the external power supply is connected in reverse. Correct the polarity connection.
K
Kristin YuSep 2, 2025
Why does my Mitsubishi Electric I/O Systems load momentarily turn on when powering on the external power supply?
- J
  Jason BellSep 3, 2025
  If a load momentarily turns on when powering on the external power supply for your Mitsubishi Electric I/O Systems, it may be due to an incorrect output caused by floating capacitance(C) between the collector and emitter of the photocoupler. Ensure that the rise time of the external power supply is 10ms or more. Install a switch (SW1) to control the external power supply on the primary side.
R
Robert GutierrezSep 6, 2025
What to do if excessive voltage is applied to the load when the Mitsubishi Electric I/O Systems output is off (triac output)?
- M
  Matthew MeltonSep 6, 2025
  If excessive voltage is applied to the load when the output is off on your Mitsubishi Electric I/O Systems (triac output), it's possible that the load is half-wave rectified internally (this can occur with solenoids). To resolve this, connect a resistor (several tens to hundreds of kOhms) across the load.
W
William RivasSep 9, 2025
Why does the Mitsubishi Electric I/O Systems load operate by incorrect input due to chattering of the external power supply?
- J
  Johnny RossSep 9, 2025
  If the load on your Mitsubishi Electric I/O Systems operates by incorrect input due to chattering of the external power supply, it suggests that a device with an input response speed that is too fast is connected to the contact output module. Use a transistor output module instead.
B
Brian EvansSep 12, 2025
How to fix Mitsubishi Electric I/O Systems input signal that does not turn on? (AC input module)
- P
  Penny RossSep 12, 2025
  If a Mitsubishi Electric I/O Systems input signal does not turn on (AC input module), it could be due to stepwise distortions appearing in the zero cross voltage of an input signal (AC). To fix this, improve the input signal waveform by using online UPS.

Mitsubishi Electric MELSEC-L Series Specifications

General

Series	MELSEC-L Series
Programming Software	GX Works2, GX Works3
CPU Type	L02CPU, L06CPU, L26CPU
Communication	Ethernet, RS-232, RS-485, USB
Programming Language	Ladder Logic, Function Block Diagram
Operating Temperature	0 to 55 °C
Vibration Resistance	5 to 8.4 Hz: Single amplitude of 3.5 mm, 8.4 to 150 Hz: 9.8 m/s2 acceleration, X, Y, and Z directions 10 times each (total 30 times)
Shock Resistance	147 m/s2, X, Y, and Z directions 3 times each
Category	Programmable Logic Controller (PLC)
Data Memory Capacity	64 KB to 256 KB (depending on CPU type)