Maintenance and service
- Your products will be 18-month warranty excluding artificial damage.
- You would receive unlimited support via video, phone or email.
- OEM/ODM is supported, MOQ is 200 sets. More modules or functions can be customized as per your requirements.
Certifications & Quality Standards
Coolmay products are fully compliant with CE and RoHS regulations, and are manufactured under ISO 9001-certified quality management systems.
Application Scenarios
About Coolmay
Founded in March 2006, Coolmay stands as a premier brand in industrial automation, serving over 10,000 customers across 200+ countries. Our team of 200+ global professionals, including 40+ R&D specialists, has completed 55,000+ projects and secured 60+ intellectual property rights. We deliver advanced, reliable solutions including PLC, HMI+PLC all-in-one machines, HMI, power supply, servo drives, stepper drives, VFDs, and IoT modules—engineered for precision and efficiency in smart manufacturing.
Global Partners
Industry Exhibitions
Payment Methods
We accept a variety of secure payment methods on AliExpress, including Western Union, WeChat, AliPay, and PayPal (where available), as well as international bank transfers (T/T). All transactions are protected under AliExpress Buyer Protection for your peace of mind.
Warranty & After-Sales Service
- 18-Month Manufacturer Warranty: Covers hardware defects and system malfunctions under normal use
- Lifetime Technical Support: Remote assistance available for configuration, firmware, and integration
- Returns & Exchanges: For damaged shipments, please contact us within 3 days with photo evidence
Contact Information
Feel free to reach out for support, documentation, or firmware files. We will respond within 24 hours.
WhatsApp: +86 199-2529-1353
WeChat: +86 199-2529-135
FAQ
1.Precautions of using PLC transistor and relay
The PLC output is a common cathode output, the theoretical value is 1A, the actual use is less than 500mA, the COM wiring is negative, please use 24V voltage, there is no voltage output when it is used as a switch. If an external relay, the relay needs an external power supply.
The relay has a contact life, the theoretical value is 30W times, and the theoretical value of the external load does not exceed 5A. Frequently, the full load current may affect the service life, and there is no voltage out.
2.Precautions of Coolmay PLC output type selection
MT: indicates the transistor output, MR: indicates the relay output, and MRT: indicates the relay transistor mixed output.
The main differences between transistor output and relay output are:
(1)The difference in current load. At present, we use a transistor with a maximum current load of 500MA, and the maximum current load of the relay is 5A (the maximum relay current of the EX2N(S)/DX2N(S) series PLC is 3A);
(2)Output power: The transistor can only be connected to the DC24V power supply , and the relay can be connected to the DC24V and AC220V power supply ;
(3)Functional characteristics: If you need to send a pulse to drive a stepper motor, you should use the transistor output or the mixed output. Also if the output switch is active, it is recommended to use a transistor output;
(4)If both the relay and the transistor are available, it is recommended to use a transistor output because the transistor has no contact life limit and the lifetime will be longer than the relay as long as the current does not exceed the limit.
