Mitsubishi PLC How to detect the input signal Do you have to use a relay?

The input of the PLC is active except for the current and voltage signal input, but a signal module is required; The switch signal input is passive, no relay is used! Generally, the input does not need a relay, depending on the occasion in which it is used. If the output is within the allowable value, the load can not pass through the relay, but the circuit is generally carried by the relay, and the life of the PLC will be shortened if the relay is not used!

The input signal has a current signal, a voltage signal, and a switch signal! The current and voltage signals are standard signal values, there are current modules and voltage modules, and the switch signals are like limit switches and travel switches!

How does Mitsubishi PLC detect the input signal, and there is no need to connect the relay.

The output needs to be isolated by a relay.

Peculiarity. Mitsubishi FX PLC is a compact and high-speed, high-performance and in all respects quite the most upscale ultra in the FX series.

In addition to the independent purpose of inputting 16 and 25 points, the applet device can also be applied to the connection between multiple basic components.

It is a set of PLCs that can meet a wide range of needs for special purposes such as connection, analog control, and positioning control.

Do not connect to the relay, as long as the input terminal voltage is not higher than 30 volts

It is also possible to use a switch, and the relay is the function of the switch.

If it is not higher than 30V, you don't need to connect the relay?? So how to connect, the COM end and the X end, directly connect to the positive and negative ends of D24V? In this case, the output terminal needs to be connected to an external power supply, how many pinching, and 24? Or AC 220V

Just a little advice and questions, not very helpful to each other**.

1. In Sanqing Brother Ling A series PLC, B indicates that it is a communication relay, which is used as an internal relay for communication systems.

2. In Mitsubishi's L series and Q series PLCs, the relay B of the command input is a special purpose internal relay type and is used as a link relay. For example, it is used for the control between the PLC and the remote station hall point communication. It can be seen in the PLC parameter settings of the PLC programming software, such as the following figure

Mitsubishi PLC input is normal, no output signal:

1. Check whether the input wiring of the PLC is normal.

2. If the input wiring is correct, it means that the PLC program is programming error.

3. Connect with the PLC with the programming cable to check the running status of the program.

Mitsubishi PLC uses a type of programmable memory for its internal storage programs to perform user-oriented instructions such as logic operations, sequence control, timing, counting and arithmetic operations, and to control various types of machinery or production processes through digital or analog inputs and outputs.

1.Check if the main power supply of the PLC is electric? Is the poer light on?

Whether there is a hardware error or not, this is less likely.

3.It is very likely that there is a problem with the emergency stop switch, which shields all the outputs, which is the most likely.

4.Check if the input signal is wrong and the program is not running?

There may also be an inductive signal that is not input, or an internal miniature relay that is broken.

Not running, the PLC is in the STOP state.

The state relay is a kind of "soft relay" inside the PLC, which has countless pairs of normally open contacts and normally closed contacts like the input relay (X) and the output relay (Y), and can be used as a general auxiliary relay (M) if it is not used as a stepping state soft component. There are 1000 internal common state relays in the FX series, S0 S9 is mainly used in the initial state of the state transition diagram (SFC), S10 S19 is mainly used in the state of the state transition diagram (SFC) to zero, S20 S499 is mainly used in the intermediate state of the state transition diagram (SFC), and S500 S899 and S900 S999 are used for power failure maintenance and signal alarm respectively.

The normally open and normally closed contacts of the status relay can be used freely within the PLC and can be used as many times as possible. When the stepper ladder command is not used, the status relay S can be used in the program as an auxiliary relay M.

1) There are five types of status relay software.

1) Initial state relay S0-S9, a total of 10 points;

2) Back to zero state relay S10-S19, a total of 10 points;

3) General state relay S20-S499, a total of 480 points;

4) Hold status relay S500-S899, a total of 400 points;

5) Alarm status relay S900-S999, a total of 100 points. These 100 status relays can be used as external fault diagnostic outputs.

Here's how to do it: first pass an empty program in, and then pass the original program into it again and let it go in, and it's no problem to turn off the power from the start. But I guess maybe that's not really the problem.

According to the data, there are the following situations: 1. Conductive substances enter the PLC and produce noise; 2. Monitor the excavator setting out of range; 3. The clock running time is super long; 4. The length of the program exceeds the storage length.

1. First of all, you need to open the PLC system software on the computer and enter the software loading interface, as shown in the following figure

2. Wait for the software to load and enter the main interface of the software.

3. Then in the left toolbar of the software, click the icon pointed by the arrow in the figure to enter the relay use change column.

4. Then find the hail roll "dcvoltmeter" in the secondary menu that appears, and you can find the M internal relay change window.

5. Find "acvoltmeter" in the secondary menu that appears, and replace English with Chinese.

6. Find the drawing in the toolbar, click the Select Component pop-up window, and click to enter the next interface.

7. The default master database, select CMOS as the group, you can find the M flip-flop in the CMOS group, and select the component.

Mitsubishi PLC how to detect encoder failure Hello dear, how to deal with common faults Undervoltage The power supply voltage is too low. MR-E-A: 160V or less Main Cause Solution The power supply voltage is too low.

Check the power supply system and control the power supply if the power supply is instantaneous and the power failure is more than 60ms. Check the power supply system • The power supply voltage drops at startup due to the power supply capacity being too small. Check the power supply system and turn it on within 5 seconds of the power cut-off.

Check the power supply system and servo amplifier internal faults. Replace the servo amplifier memory abnormality 1, replace the servo amplifier clock abnormality, replace the servo amplifier watchdog abnormality, replace the servo amplifier memory abnormality 2 replace the servo amplifier al 12: pickpocket ram rom abnormality al 13:

Printed circuit board abnormality AL 14: CPU abnormality AL 15: EEPROM abnormality Main Causes Solution Internal fault of servo amplifier.

Replace the servo amplifier. Encoder Abnormality1 The communication between the encoder and the servo amplifier is abnormal. The main reason is that the joint CN2 is not connected properly.

Wiring correctly. Encoder failure. Replace the servo motor.

Faulty encoder cable. (Open or Short) Repair or replace the cable. The coordination between the servo amplifier and the servo motor is incorrect.

Use the correct fit Circuit board abnormality 2, Memory abnormality 3 AL 17: CPU and component abnormality AL 19: ROM memory resistance abnormality Main cause Handling method Internal fault of servo amplifier.

Replace the servo amplifier. The motor is often matched with the servo amplifier and the servo motor in the wrong way. The main reason for the treatment method is that there is an error in the coordination between the servo amplifier and the servo motor.

Use the right fit. The servo motor of the parameter selection does not match the servo amplifier currently in use. Set the parameters correctly.

Encoder Abnormality 2: The communication between the encoder and the servo amplifier is abnormal. The main reason is that the encoder connector CN2 is not connected properly. Wiring correctly.

Encoder cable failure (open or short circuit) Repair or replacement of cable Encoder failure. Replace the servo motor. The main circuit is abnormal, and the output of the servo motor (u·v·w phase) is grounding faulty.

Main Cause: Handling Method: There is an open circuit between the power input and output wiring on the main circuit terminal (TE1). Repair wires.

1. In the DU Mitsubishi A series PLC, B represents the communication ZHI relay, which is used as the DAO internal relay return for the communication system.

2. In Mitsubishi's L series and Q series PLCs, relay B is a special-purpose internal relay type and is used as a link relay. For example, it is used for control between PLC and remote site communication. This can be seen in the PLC parameter settings of the PLC programming software, for example, in the figure below

In Mitsubishi's L-series and Q-series PLCs, relay B for command input is a special-purpose interior.

The relay type is used as a chain capacitance relay. For example, it is used for control between PLC and remote site communication. This can be seen in the PLC parameter settings of the PLC programming software, for example, in the figure below

In the Mitsubishi A series PLC, B stands for a communication relay, an internal relay used in a communication system.

The internal bits in the Mitsubishi A Q L series PLC, generally known as the conversion relay (A Q) or the link relay (L), are generally used as auxiliary relays.

Auxiliary relays can be used as status relays, but not vice versa. Only state relays can be used on step commands.