CT 1228 Digital Input 8DI 24VDC PNP

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Product Description

Product Attributes

Model No.: CT-1228

Packaging & Delivery

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Product Description

CT-1228 Digital Input 8DI 24VDC PNP

The CT-1228 is an 8-channel digital input module from Sichuan ODOT Automation System Co., Ltd., designed for 24VDC NPN/sink-type applications where low-level input is valid. It interfaces with dry contacts, active outputs, and 2-/3-wire digital sensors. Each channel features opto-isolation between field inputs and the internal bus, an LED status indicator, and configurable signal filtering and holding time. With an optional counting sub-module, every channel supports an independent 32-bit counter (<200 Hz), allowing user-defined counting mode, direction, and byte transmission order for flexible integration into industrial Control Systems.

Technical Parameters

General Parameters
Power Consumption	Max.85mA @ 5.0Vdc
Isolation	I/O to internal bus: opto-couple isolation (3KVrms)
Field Power	Nominal: 24Vdc, Range:22-28Vdc
Wiring	Max.1.0mm² (AWG 17)
Mounting Type	35mm DIN-Rail
Size	1151475mm
Weight	65g
Environment Specification
Operating Temperature	-35℃~70℃
Operating Humidity	5%~95% RH(No Condensation)
Ingress Protection Rating	IP20
Input parameters
Channel Number	8 channels input
LED Indicator	8 channel input LED indicator
Turn-on voltage	Min.10Vdc to Max.28Vdc
Turn-off Voltage	Max.5Vdc
Turn-on current	Max.5mA/channel @ 28V
Input impedance	>7.5kΩ
Input delay	OFF to ON: Max.3ms,ON to OFF: Max.2ms
Filter time	Default 10ms
Sample frequency	500Hz
Counter frequency	<200Hz

Application scenarios:

FAQ

Q：What is the input logic of CT-1228?

A：Low-level active, NPN input, 24VDC, supports counting up to 200Hz.

Q：What field devices can CT-1228 be used with?

A：Industrial sensors, high-speed pulse counters, digital signal acquisition.

Q：Does CT-1228 require an external power supply?

A：Internal power supply, no additional power needed.

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.