1. External equipment failure. Such faults come from external devices such as various sensors, switches, actuators, and loads. The failure of this part of the equipment will directly affect the control function of the system. This type of failure is usually caused by the quality and longevity of the equipment itself.
2. System failure. This is a total failure that affects the operation of the system. System failures can be divided into fixed failures and occasional failures. If a failure occurs, it can be restarted to restore the system to normal, just like our computer system, which can be considered an accidental failure. Conversely, if the reboot cannot be recovered and the hardware or software needs to be replaced before the system can live normally, it can be considered a fixed fault, which is generally caused by the wrong system design or the long operation of the system.
3. Hardware failure. This type of fault mainly refers to the fault caused by the damage of the modules in the system, such as CPU, memory, power supply, I/O module, etc. (especially I/O module). This type of fault is generally more obvious, and the impact is also accompanied, they are mainly caused by improper use or long use, and the aging of components in the module.
4. Software failure. This type of failure is caused by a bug in the software itself. The main thing is that the software design is not well thought out. It will be triggered as soon as the conditions are met. In practical engineering applications, software errors are almost unavoidable due to the complexity and workload of software, which raises the question of software reliability.
4. Do not execute the program: the input check is identified by the input LED indicator, or the input monitor composed of a writer is checked. When the input LED is not lit, it can be preliminarily determined that the external input system is faulty, and then check with the multimeter.
If the output voltage is abnormal, it can be determined that the input unit is faulty. When the LED is on but the internal monitor is not displayed, it is considered to be a fault of the input unit, CPU unit, or expansion unit.
The program performs a check through a monitor check on the writer. When the contact status of the ladder diagram does not match the result, it is a program error (e.g., double use of internal relays, etc.), or a malfunction in the calculation part.
Output checks can be identified using the output LED indicator. If the calculation result is correct but the output LED indicates an error, it can be considered as a fault of the CPU unit or 1/0 interface unit. When the output LED is bright but there is no output, it can be determined that the output unit is faulty, or the external load system is faulty.
5. Some programs are not executed: the check method is the same as the previous item, but if the input time of the counter, step controller, etc. is too short, there will be no response failure, then the input time should be checked whether the input time is large enough, and the verification can be carried out according to the relationship between the input time < the * response time of the input unit + the operation scanning time multiplied by 2.
6. If the power supply is powered off for a short time, the program content will also disappear: in order to make the microprocessor start correctly, the PLC is equipped with an initial reset point circuit and a saving program circuit when the power supply is disconnected. When such a circuit fails, the program cannot be saved. Check the on/off of the available power supply.
7. PROM cannot operate: first check whether the PROM is inserted well, and then determine whether the chip needs to be replaced.
8. After the power supply is re-put into or reset, the action stops: this fault can be regarded as caused by noise interference or poor internal contact of the PLC. The cause of noise is generally caused by the reduction of the capacitance of the small capacitor in the circuit board or the poor performance of the components, and the cause of the poor contact can be checked by gently tapping the PLC body. Also check the plugged in status of the cables and connectors.
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Omron PLC's maintenance procedures and equipment cleaning regulations
1. Maintenance procedures, regular testing and adjustment of equipment
(1) Check the connection of the terminal blocks in the PLC cabinet every six months or quarters, and reconnect the loose places in time if they are found;
(2) Re-measure the working voltage of the power supply to the main engine in the cabinet every month ...
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Analysis of common Omron fault codes
1. C200H series PLC fault codes:
- E0001: Undefined program error
- E0002: Undefined instruction error
- E0003: Missing Program Error
- E0004: Data error
- E0005: Pointer error
- E0006： ...
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Precautions for the use of Omron relays
1. Installation orientation
Proper installation orientation is critical to maintaining the best characteristics of the relay.
· The installation orientation of the impact resistance idealization is to make the contact point and the moving member (part of the armature) in the fitness movement orientation and the vibration or impact orientation upright, very normally open contact in the electric ...
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Omron Medical Electronic Blood Pressure Monitor HEM-7071 Features:
1. Intelligent upper arm sphygmomanometer for more accurate measurement
2. Enlarge the screen, completely from the user's point of view
3. It can record 84 measurement results for 2 people respectively, and the total storage value is 168 times
4. The new "Fit Cuff" armband, which is easier to roll up, is adopted.
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Introduction to the wiring steps of Omron switch relays
1. Before connecting, determine the voltage required for the proximity switch, and if it is a 3-wire system, determine whether it is PNP type or NPN type. The proximity switch is divided into 2-wire, 3-wire and 4-wire systems.
2. When the wire system proximity switch is connected with the relay, it is in series form. i.e. the relay is connected to the proximity switch ...
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What are the mounting methods of Omron sensors?
The sensor can be fixed in two ways: PCB and disc mounting
1. PCB installation method
In general, the primary measurement signal of the PCB-mounted sensor is relatively small. The output terminal of the sensor adopts the way of pi pin or SMD, which can be performed according to the welding process of the general device in soldering.
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Wiring method of Omron PLC
The connection method is as follows: the brown wire is connected to the PLC input point, the PLC com point is connected to the positive pole of the power supply, and the negative pole of the power supply is connected to the blue wire.
NPN type: brown is connected to the positive power supply, blue is connected to the negative power supply, the black wire is connected to the PLC input point, and the PLC com point is connected to the positive power supply. NPN is a leak type, and the detected object ...
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How to connect Omron plc IP address?
1. The IP address of the computer is automatically obtained.
2. The computer is directly connected to the PLC network port.
3. Open the DirectEthernetUtility software. Software Setup Start - > All Programs - > OMRON - >Communications Middleware Utilities - > DirectE...
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The working principle and purpose of Omron relays
How it works
Add a certain voltage at both ends of the coil, a certain current will flow through the coil, thus producing an electromagnetic effect, and the armature will overcome the tensile force of the return spring under the action of electromagnetic force attraction and attract to the core, thereby driving the dynamic contact and static contact (normally open contact) of the armature ...
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Causes and solutions for E1 fault codes in Omron electronic sphygmomanometers
The E1 fault code usually appears on the display of the blood pressure monitor and indicates that the inflation pressure is too high or too low. This failure can lead to inaccurate measurement results or even inability to complete the measurement.
Solution(s):
1. Check whether the cuff is worn correctly and whether it is properly tightened.
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Selection rules for Omron relays
1. Coil voltage: also known as input voltage, used to control the contact on/off, with AC24V, DC24V, AC220V and other specifications
2. Contact capacity: the voltage and current of the load
3. Contact structure: 2C (double-pole double-throw), 4C (four-pole double-throw), 1A, 1B, etc
4. Load type ...
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How to choose the right Omron switch?
1. Top button switch: suitable for occasions that require frequent pressing, such as video game consoles, calculators, etc.
2. Side button switch: suitable for occasions that need to be pressed on the side, such as mobile phones, remote controls, etc.
3. Knob switch: suitable for occasions that require rotary operation, ...
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Introduction to Omron electronic thermometer and how to use it
Using an Omron electronic thermometer, which is displayed digitally and compared with a conventional thermometer, there is a small chance of error, generally no more than 0.1 degrees, so there is little need to worry about inaccuracies. Every time you use it, it's also very simple, just press the power switch ...
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What should Omron PLC pay attention to when selecting a model
Omron PLC is a compact PLC with perfect functions, which can provide high value-added machine control for industry-leading conveying and decentralized control; It also has the ability to upgrade through a variety of advanced built-in boards, large program capacity and memory units for efficient software development in the Windows environment ...
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Omron PLC cannot connect to the computer
Method: If the computer has a 9-pin serial port, then you can make a wire. The wiring is as follows: computer PLC2 --------- 23 --------- 3 5 --------- 9 If you don't have it, you need a USB to serial port cable (you need to install a driver), and you can connect to PLC through the above wire ...
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Omron's non-contact temperature sensors bring convenience to work and life
In recent years, Omron has launched MEMS non-contact temperature sensors, and the technology incorporated into them has gradually presented the future of smart life in front of our eyes. Next, let's learn more about Omron's MEMS contactless sensor, and deeply feel the future of work and life.
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How to classify Omron signal relays?
1. Classified according to the principle of action
The electromagnetic relay drives the armature and the movable part to act through the suction generated by the current in the relay coil in the electromagnet and changes the working state of the contact system. Such as DC stepless relays, DC polarized relays, AC relays, binary differential relays...
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![Omron's new [Programmable Controller CP2E-ECT] was officially released](https://www.76kj.cn/data/attachment/forum/202212/20/160802nshg0glphkrqsgrl.png)
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Omron's new [Programmable Controller CP2E-ECT] was officially released
In December 2022, Omron Automation (China) Co., Ltd.'s new product [Programmable Controller CP2E-ECT] was officially released. The product is based on Omron's full research on the equipment needs of OEM customers in China, and is independently developed and produced by Omron China.
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Common problems and solutions of Omron PLC
1. Omron PLC cannot be connected to the computer
There are two reasons why the PLC and the computer cannot be connected: hardware and software.
The hardware reasons are: the interface type does not match (such as USB, RS232, RS422, RS485, CAN, etc., both sides should be the same.) If you want to use the corresponding converter if you want to), ...
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How to choose Omron relays
1. Select the rated working current of the electromagnetic relay coil: For the DC electromagnetic relay driven by transistors or integrated circuits, the rated working current of the coil (generally 2 times the suction current) should be within the output current range of the driving circuit.
2. Select electromagnetic relay contact ...
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