Digital Output Module 8DO 24VDC NPN

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Product Description

Product Attributes

Model No.: CT-2218

Packaging & Delivery

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Product Description

CT-2218 Digital Output Module 8DO 24VDC NPN

The CT-2218 Digital Output Module is a high-reliability industrial I/O module developed by Sichuan Odot Automation, engineered for demanding automation environments.

It features 8-channel digital output at 24VDC with an NPN open-collector configuration, where a low-level signal (0V) is active, enabling direct control of field devices such as relays, solenoid valves, and actuators. Optocoupler isolation between the internal bus and field outputs ensures robust electrical separation, significantly enhancing system stability and noise immunity. Each channel includes an independent LED indicator for real-time status monitoring and rapid diagnostics.

Built-in thermal shutdown and short-circuit protection safeguard the module and connected equipment under abnormal conditions. Ideal for PLC systems, smart factories, and Industrial Automation applications, the CT-2218 reflects Sichuan Odot Automation’s commitment to reliability, safety, and seamless integration.

Technical Parameters

General parameters
Power	Max.64mA @ 5.0Vdc
Isolation	I/O to internal bus: opto-couple isolation (3KVrms)
Field Power	Nominal: 24Vdc, Range: 19.2~28.8Vdc
Wiring	I/O Wiring： Max.1.0mm²(AWG 17)
Mounting Type	35mmDIN-Rail
Size	1151475mm
Weight	65g
Environment Specification
Operational Temperature	-40~85℃
Operational Humidity	5%~95% RH(No Condensation)
Protection Class	IP20
Output Parameters
M/S/F:Channel Number	8 Channels
M/S/F:LED Indicator	8 channels output LED indicator
M/S:Rated Current	Single channel output：Max. 1000mASimultaneously output: Max.500mA
M/S: Leak Current	Max. value：3uA
M/S/Output Impedance	< 200mΩ
M/S/Output Delay	OFF to ON:Max.50us ON to OFF:Max.300us
M/S/Protection Function	Over temperature shutdown: typical 135℃Overcurrent protection: typical value 3A Short-circuit protection: Supported

Application scenarios:

FQA

Q：What type of output does the CT-2218 provide, and what devices can it control?

A：The CT-2218 provides 8-channel NPN-type digital outputs with a 0VDC (low-level active) signal. It is designed to directly drive common field devices such as relays, solenoid valves, indicator lights, and other 24VDC NPN-compatible loads.

Q：Does the CT-2218 offer electrical isolation and protection features?

A：Yes. The module uses optocoupler isolation between the internal system bus and field outputs to prevent noise and voltage surges from affecting the controller. It also includes built-in short-circuit protection and thermal shutdown to safeguard the module and connected equipment under fault conditions.

Q：How can users monitor the status of each output channel?

A：Each of the 8 output channels is equipped with an individual LED indicator, providing real-time visual feedback on the on/off state—making commissioning, troubleshooting, and routine maintenance quick and intuitive.

Certifications & Quality Assurance:

ODOT Products comply with international industrial standards, including CE and RoHS, and undergo strict quality control to ensure long-term reliable operation in industrial environments.