Xiamen Order Line AutomationEquipment Co., Ltd Quality Control

After receiving the PLC, a comprehensive and meticulous inspection is required to ensure its normal operation and stability for subsequent use. The following are the inspection contents summarized from multiple aspects for your reference:

1, Appearance inspection

Surface of control cabinet: Check whether the surface of the PLC control cabinet is flat and free of scratches, ensuring that the appearance is intact and undamaged.

Control cabinet door: Check if the control cabinet door is intact and easy to open and close, ensuring convenient daily maintenance and operation.

Internal wiring: Check if the wiring inside the control cabinet is neat and well grounded to avoid safety hazards and signal interference caused by disorderly wiring.

2, Component inspection

PLC host:

Check if the PLC host is correctly installed in a fixed position without any looseness.

Confirm that the host is properly connected to other components (such as power modules, I/O modules, etc.) without any disconnection or poor contact.

Power module:

Confirm whether the input and output voltage range of the power module meets the requirements, and use a voltmeter for testing.

Check if the power module is securely installed in the control cabinet without overheating or abnormal noise.

Input/Output Module (I/O Module):

Check if the quantity and type of I/O modules match the order and if the connection status is correct.

Confirm whether the power and signal lines of the sensor and actuator are connected correctly, without damage or short circuit.

Communication module:

Check the type and connection status of the communication module to ensure that it can communicate normally with other devices such as the upper computer, touch screen, etc.

Test the communication function of the communication module, such as whether the data transmission speed, communication protocol, etc. meet the requirements.

3, Software verification

PLC program:

Confirm that the PLC program has been correctly downloaded to the PLC host and perform a simple functional test to verify whether the program logic is correct.

Use debugging tools or online monitors to track the program's running status and check for any abnormal or logical errors.

Monitoring interface:

Check if the monitoring interface can display various parameters and status information normally, such as input and output signals, fault alarms, etc.

Test whether the operation functions of the monitoring interface, such as parameter settings and fault reset, are effective.

Alarm system:

Test whether the alarm system is working properly, including whether the sound, light and other alarm methods are effective.

Read the fault code manual of PLC to understand the meaning and handling methods of alarm information.

4, Protective inspection

Electrical protection:

Check whether the electrical components inside the control cabinet comply with relevant standards and have no obvious protective hazards.

Pay special attention to checking whether the isolation measures between the high-voltage and low-voltage parts, and between the strong and weak electrical parts are in place.

Insulation impedance measurement:

Use testing instruments to measure the insulation impedance inside the control cabinet to ensure that it meets relevant requirements (generally should be greater than a certain value, such as 5M Ω or above).

Grounding system:

Confirm that the grounding system of the control cabinet is in good condition and meets the specifications, and the grounding resistance should be less than the specified value (such as below 10 Ω).

5, Other inspections

Document materials:

Check if the documentation accompanying the PLC is complete, including user manuals, programming manuals, certificates of conformity, etc.

Accessory inspection:

Check whether the accessories of the PLC (such as connecting wires, connectors, installation brackets, etc.) are complete and meet the requirements.

Packaging inspection:

Check if the packaging of the PLC is intact, without any compression, deformation, or damage.

6, Write acceptance report

After completing all the above checks, a detailed acceptance report should be prepared to record the inspection results and any issues found. If there are any problems, they should be promptly reported to the supplier or manufacturer for handling.

Through the comprehensive inspection process mentioned above, it can be ensured that the received PLC equipment meets the quality requirements and usage needs, laying a solid foundation for subsequent installation, debugging, and stable operation.