Digital Input Module 32DI 24VDC Sink or Source

Digital Input Module 32DI 24VDC Sink or Source

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Product Description

Product Attributes

Model No.: CT-124H

Packaging & Delivery

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Product Description

CT-124H Digital Input Module 32DI 24VDC Sink or Source Type

The CT-124H is a versatile 32-channel digital input module from Sichuan ODOT Automation System Co., Ltd., supporting both sink (PNP, high-level valid) and source (NPN, low-level valid) wiring with 24VDC inputs via a 34-pin male connector. It interfaces with dry contacts, active outputs, and 2-/3-wire digital sensors. Each channel features optocoupler isolation between field inputs and the internal bus, configurable signal filtering, and adjustable input holding time. With counting enabled via ODOT configuration software and an optional sub-module, every channel provides an independent 32-bit counter (counting frequency <200 Hz), with user-defined counting mode, direction, and byte transmission sequence—ideal for high-density, flexible industrial I/O applications.

Technical Parameters

General parameters
Power	Max.60mA @ 5.0Vdc
Isolation	I/O to internal bus: opto-couple isolation (3KVrms)
Field Power	Nominal:24Vdc, Range: 19.2-28.8Vdc
Wiring	34P male connector 2.54mm Pin header
Mounting Type	35mmDIN-Rail
Size	1151475mm
Weight	65g
Environment Specification
Operational Temperature	-35~70℃
Operational Humidity	5%~95% RH(No Condensation)
Protection Class	IP20
Input parameters
Channel Number	32 channels input
LED Indicator	32 channels input LED indicator
Turn-on voltage	High input: Min.10Vdc to Max.28Vdc (Common Terminal:0Vdc) Low input: Min.0Vdc to Max.14Vdc (Common Terminal:24Vdc)
Turn-off voltage	High input:Max.5Vdc (Common Terminal:0Vdc) Low input: Min.19Vdc (Common Terminal:24Vdc)
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:

FQA

Q：What types of digital input does the CT-124H module support? Is it compatible with both PNP and NPN sensors?

A：Yes. The CT-124H supports 32 digital input channels configurable as either sink or source type: in sink mode, a high-level input is valid (compatible with PNP sensors); in source mode, a low-level input is valid (compatible with NPN sensors).

Q：Does the CT-124H support high-speed counting? What are its performance specifications?

A：Yes. With the counting sub-module enabled via ODOT configuration software, each channel features an independent 32-bit counter with a maximum counting frequency of 200 Hz, and allows per-channel configuration of counting mode, direction, and byte transmission sequence.

Q：What measures does the CT-124H employ for electrical isolation and signal stability?

A：The module uses optocoupler-based isolation between the internal bus and field inputs. Combined with user-configurable input filtering and signal holding time, it effectively suppresses noise in industrial environments to ensure reliable operation.

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.