Y301-440/444 I/O Module Specification

Y301-440	Y301-444

• Y301-440/444 Technical Manual

Contents

1. Overview
2. Ordering Information
3. Key Features
4. Technical Specifications
5. Interfaces and Pinout
6. Mechanical and Environmental
7. Automation Rules

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1. Overview

The Y301-440/444 series provides Modbus RTU serial I/O expansion in two enclosure sizes.

Model	DI	DO	AI	Typical Role
Y301-440	4	4 (SPDT)	-	Multi-zone digital automation
Y301-444	4	4 (SPDT)	4 (0-10 V / 0-5 V / 4-20 mA)	Process control with analog sensing

Product Highlights

• Shared Modbus RTU firmware with RS485, RS232, and TTL interface options
• DIN-rail or screw mounting with front-panel status LEDs for power, DI, and DO
• Y301-444 adds four analog inputs in a larger 145 x 90 x 40 mm enclosure
• Y301-440 keeps a compact 115 x 90 x 40 mm footprint for digital-only control

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2. Ordering Information

2.1 Model Naming

Y301-XYZ

• XYZ: function combination (440 = 4DI + 4DO + 0AI, 444 = 4DI + 4DO + 4AI)

2.2 Interface Options

All models are available with the following serial interfaces:

Interface	Description
RS485	Standard version for Modbus RTU multi-drop networks
RS232	Optional version for point-to-point communication
TTL	Optional on selected models for direct MCU integration

2.3 SKU Matrix

SKU	Description
Y301-440	4 DI + 4 DO, standard digital I/O node
Y301-444	4 DI + 4 DO + 4 AI, full-featured I/O node

2.4 Package Contents

Module, digital quick reference guide, and warranty card. Optional accessories include a DIN clip, USB-to-RS485 converter, 12/24 VDC power supply, and shielded RS485 wiring kit.

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3. Key Features

1. High-power relays - Four SPDT contacts per model, rated at 277 VAC / 10 A or 28 VDC / 10 A
2. Opto-isolated DI - Four dry/wet contact inputs with pulse counting and configurable debounce
3. Analog input on Y301-444 - Four channels, each configurable for 0-10 V, 0-5 V, or 4-20 mA, with 16-bit resolution and +/-1% FS accuracy
4. Embedded automation - Up to 8 local rules, including follow, pulse, delay, schedule, logic, and AI threshold modes
5. Retention and addressing - DO retention plus 5-bit DIP offset stacked on the software Modbus address
6. Industrial design - 5-36 VDC input, -40 to +85 C environment, hardware watchdog, Reload button, and surge-protected communication ports

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4. Technical Specifications

4.1 Electrical and Environmental

Parameter	Specification
Supply voltage	5-36 VDC
Typical current	200 mA @ 12 V (all DO off)
Maximum current	280 mA @ 12 V (four relays on + AI sampling)
Operating temperature	-40 to +85 C
Humidity	5-95% RH, non-condensing
Altitude	<= 2000 m

4.2 Digital Input (4 channels)

Item	Specification
Type	Dry/wet contact, opto-isolated
Voltage range	5-36 V (wet contact mode)
Input current	<5 mA per channel
Sampling rate	100 Hz
Pulse counter	32-bit, selectable rising/falling edge
Debounce	5-255 ms (default 50 ms)

4.3 Digital Output (4 x SPDT relays)

Item	Specification
Contact rating	277 VAC 10 A / 28 VDC 10 A
Minimum load	10 VAC 10 mA
Switching time	<10 ms operate / <5 ms release
Electrical life	100k cycles at rated load
Output retention	None / soft reboot / full retention

4.4 Analog Input (Y301-444, 4 channels)

Item	Specification
Input type	0-10 V, 0-5 V, or 4-20 mA, configurable per channel
Resolution	16-bit
Accuracy	+/-1% FS
Sampling rate	10 Hz
Input impedance	Voltage mode: >100 kohm; current mode: 250 ohm
Overvoltage protection	+/-30 V

4.5 Communication

Item	Specification
Interface	RS485 (2-wire), optional RS232 or TTL
Protocol	Modbus RTU slave
Baud rate	600-230400 bps (default 9600)
Slave address	1-255 (software) + DIP offset 0-31

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5. Interfaces and Pinout

5.1 Terminal Overview

Group	Description
Power	V+, V- screw terminals + DC 5.5 x 2.1 mm jack
DIP switch	SW1-SW5 (binary address offset)
Reload	Hold 3-15 s to restore factory defaults
DI	COM+, COM-, DI1-DI4
DO	NCn / COMn / NOn for channels 1-4
AI (444 only)	AI1+, AI1-, AI2+, AI2-, AI3+, AI3-, AI4+, AI4-
Communication	A/B/GND (RS485) or TX/RX/GND (RS232/TTL)

5.2 Wiring Guidelines

• Use 20-16 AWG power wiring with a 2 A upstream fuse.
• For dry-contact DI, bridge COM+ to the target DI through the external contact.
• For wet-contact DI, connect the external 5-36 V reference to COM-.
• For relay outputs driving inductive loads, add an RC snubber for AC loads or a flyback diode for DC loads.
• For Y301-444 analog input wiring, connect the source directly in voltage mode and use the current loop terminals in current mode.
• For RS485, use shielded twisted pair, terminate both ends with 120 ohm resistors, and keep a common reference ground.

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6. Mechanical and Environmental

Item	Y301-440	Y301-444
Dimensions	115 x 90 x 40 mm	145 x 90 x 40 mm
Mounting	35 mm DIN clip or screw slots	35 mm DIN clip or screw slots
Protection	IP20	IP20
Housing	UL94 V-0 flame-retardant plastic	UL94 V-0 flame-retardant plastic

Keep at least 15 mm clearance above and below, 10 mm on each side, and 40 mm in front for wiring and airflow.

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7. Automation Rules

Mode	Description
DI follow	DO mirrors the DI state
Pulse output	Configurable ON/OFF pulse width
Delay control	Programmable ON/OFF delay
Cyclic toggle	Periodic ON/OFF cycling
Timer/schedule	Time-based activation
AI threshold (444)	Triggered by analog input threshold
Logic mode	AND/OR logic combination
Watchdog mode	Automatically resets the DO when the timeout condition occurs

• Up to 8 rules total, with up to 2 rules per DO channel
• Rules run locally without host polling
• When enabled, output retention stores the last automation state

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• Manufacturer: Hunan YenGear Tech Co., Ltd.
• Address: Room 21014, Building 1, Fudi Xingguang Tiandi, Yingxin Road, Yuhua District, Changsha, Hunan, China
• Email: hi@yengear.com
• Website: www.yengear.com