Digital Input Module16DI 24VDC Sink Type

Digital Input Module16DI 24VDC Sink Type

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Product Description

Product Attributes

Model No.: CT-121F

Packaging & Delivery

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Introducing the CT-121F

SPS-C Series IO_20260119_11180739

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Product Description

CT-121F Digital Input Module16DI 24VDC Sink Type

The CT-121F is a 16-channel digital input module from Sichuan ODOT Automation System Co., Ltd., a global provider of robust industrial I/O Solutions. Designed for 24VDC sink-type inputs with high-level signal validity, 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), with user-defined counting mode, direction, and byte transmission order. Channels can also be individually disabled for flexible system configuration.

Technical Parameters

General Parameters
Power Consumption	Max.63mA @ 5.0Vdc
Isolation	I/O to internal bus: opto-couple isolation (3KVrms)
Field Power	Nominal:24Vdc, Range: 19.2-28.8Vdc
Wiring	Max.: AWG 18;Min.: AWG 24
Installation	35mm DIN-Rail
Size	1151475mm
Weight	65g
Environment Specification
Operating Temperature of Vertical Installation	-35℃~70℃
Operating Temperature of Horizontal Installation	-35℃~60℃
Relative Humidity	5~ 95%RH (No Condensation)
Storage Temperature	-40℃~85℃
Storage Humidity	5~ 95%RH (No Condensation)
Manufacturing Test Temperature	-40℃~75℃
Ingress Protection Rating	IP20
Vibration Resistance	Comply with IEC 61131-2 and EC 60068-2-6
Impact resistance	Comply with IEC 61131-2 and IEC 60068-2-27
EMC Performance	Comply with IEC 61131-2 and IEC 61000-4
Input parameters
Channel Number	16 channel sink input
LED Indicator	16 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
Effective pulse width for counting	2.5ms

Application scenarios:

FQA

Q：What are the input channels and voltage of CT-121F?

A: 16 channels, 24VDC, high-level active, PNP input type.

Q：Does CT-121F support counting?

A: Yes, up to 200Hz, suitable for high-speed pulse signal acquisition.

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.