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Y301-440/444 I/O Module Specification
| Y301-440 | Y301-444 |
|---|---|
 | |
Document Control
| Item | Detail |
|---|---|
| Version | V1.0.0 |
| Release Date | November 2025 |
| Product Category | Serial I/O Module |
Table of Contents
- Overview
- Ordering Information
- Key Features
- Technical Specifications
- Interface & Pin Description
- Mechanical & Environmental
- Automation & Linkage Rules
1. Overview
The Y301-440/444 family 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 (0–10V / 4–20 mA) | Analog-driven process control |
Positioning Highlights
- Shared Modbus-RTU firmware with RS485/RS232/TTL connectivity
- DIN rail or screw mounting with power, DI, DO LEDs on the front panel
- Y301-444 adds four analog inputs plus enlarged enclosure (145 × 90 × 40 mm)
- Y301-440 keeps compact 115 × 90 × 40 mm footprint for pure digital control
2. Ordering Information
2.1 Model Naming
Y301-44X-IF
- 44X: 440 = 4DI/4DO, 444 = 4DI/4DO + 4AI
- IF: Interface option (RS485 default, RS232 or TTL optional)
2.2 SKU Matrix
| SKU | Interface | Description |
|---|---|---|
| Y301-440-RS485 | RS485 | Standard multi-drop digital I/O node |
| Y301-440-RS232 | RS232 | Point-to-point / HMI integration |
| Y301-444-RS485 | RS485 | Full DI/DO/AI module for multi-drop networks |
| Y301-444-RS232 | RS232 | Point-to-point / HMI integration |
2.3 Package Contents
Module, digital quick reference, warranty leaflet. Optional accessories: DIN clips, USB-RS485 converter, 12/24 VDC supply, shielded RS485 cabling kit.
3. Key Features
- High-Power Relays – Four SPDT contacts per model rated AC 277V/10A or DC 28V/10A.
- Opto-Isolated DI – Four dry/wet channels with pulse counting and configurable debounce.
- Analog Inputs (Y301-444) – Four channels selectable per channel as 0–10V or 4–20 mA, 16-bit resolution, ±1% FS accuracy.
- Embedded Automation – Up to 8 linkage rules (2 per DO) covering follow, pulse, delay, schedule, logic, and AI threshold modes.
- Retention & Addressing – DO state hold (none/soft/full) plus 5-bit DIP offset stacked on the software Modbus address.
- Industrial Design – 5~36V DC input, -40°C~85°C ambient, hardware watchdog, reload button, surge-protected ports.
4. Technical Specifications
4.1 Electrical & Environmental
| Parameter | Y301-440 | Y301-444 |
|---|---|---|
| Supply Voltage | DC 5~36V | DC 5~36V |
| Typical Current @12V | 180 mA | 220 mA |
| Max Current @12V | 250 mA (all relays on) | 300 mA (relays + AI sampling) |
| Operating Temperature | -40°C ~ +85°C | -40°C ~ +85°C |
| Humidity | 5~95% RH, non-condensing | 5~95% RH, non-condensing |
4.2 Digital Inputs
| Item | Specification |
|---|---|
| Channels | 4 per model |
| Type | Dry/wet contact, optically isolated |
| Voltage Range | 5~36V (wet mode) |
| Input Current | <5 mA/channel |
| Sampling Rate | 100 Hz |
| Pulse Counter | 32-bit, rising/falling selectable |
| Debounce | 5–255 ms (default 50 ms) |
4.3 Digital Outputs
| Item | Specification |
|---|---|
| Channels | 4 × SPDT relays per model |
| Contact Rating | AC 277V 10A / DC 28V 10A |
| Minimum Load | AC 10V 10 mA |
| Switching Time | <10 ms pickup / <5 ms release |
| Electrical Endurance | 100k cycles @ rated load |
| State Retention | None / soft reboot / full retention |
4.4 Analog Inputs (Y301-444)
| Item | Specification |
|---|---|
| Channels | 4 |
| Modes | 0–10V or 4–20 mA selectable per channel |
| Accuracy | ±1% FS |
| Resolution | 16-bit |
| Sampling Rate | 10 Hz per channel |
4.5 Communication (Shared)
| Item | Specification |
|---|---|
| Interface | RS485 (2-wire), RS232, TTL optional |
| Protocol | Modbus-RTU slave |
| Baud Rate | 600–230400 bps (default 9600) |
| Slave Address | 1–255 (software) + DIP offset 0–31 |
5. Interface & Pin Description
5.1 Terminal Summary
| Group | Y301-440 | Y301-444 |
|---|---|---|
| Power | V+, V- screw terminals + DC 5.5×2.1 mm jack | Same as Y301-440 |
| DIP Switch | SW1–SW5 (binary offset, ON = 1) | SW1–SW5 (binary offset, ON = 1) |
| Reload | Hold 3–15 s to restore factory defaults | Hold 3–15 s to restore factory defaults |
| DI | COM+, COM-, DI1~DI4 | COM+, COM-, DI1~DI4 |
| DO | NCn/COMn/NOn for channels 1–4 | NCn/COMn/NOn for channels 1–4 |
| AI | – | AI1-/AI2-/AI3-/AI4- plus V+/I+ per channel |
| Communication | A/B/GND (RS485) or TX/RX/GND (RS232/TTL) | Same as Y301-440 |
5.2 Wiring Guidance
- Use 22–16 AWG power leads with an upstream 2 A fuse.
- Dry DI: COM+ to DI through switch/relay. Wet DI: external 5–36V referenced to COM-.
- DO: add RC snubbers (AC) or flyback diodes (DC) for inductive loads.
- AI (Y301-444): connect either V+ (voltage) or I+ (current) per channel—never both simultaneously.
- RS485: shielded twisted pair, 120 Ω termination at both ends with a shared reference ground.
6. Mechanical & Environmental
| Item | Y301-440 | Y301-444 |
|---|---|---|
| Dimensions | 115 × 90 × 40 mm | 145 × 90 × 40 mm |
| Mounting | 35 mm DIN rail clip or screw slots | 35 mm DIN rail clip or screw slots |
| Protection | IP20 | IP20 |
| Enclosure | UL94 V-0 flame-retardant plastic | UL94 V-0 flame-retardant plastic |
Maintain ≥20 mm clearance above/below, ≥10 mm at the sides, and ≥60 mm at the front for wiring and airflow.
7. Automation & Linkage Rules
| Mode | Description |
|---|---|
| DI Follow | DO mirrors selected DI channel |
| Pulse Output | Programmable ON/OFF pulse generator |
| Delay Control | Configurable ON/OFF delays |
| Cyclic Toggle | Periodic ON/OFF cycle |
| Timer / Schedule | Calendar-based operation window |
| Button Mode | Momentary pushbutton handling |
| Logic Mode | AND/OR/XOR triggers |
| AI Threshold (Y301-444) | Trigger DO based on analog level > / < threshold |
- Up to 8 rules (2 per DO) stored locally
- DO retention can preserve last automation state when enabled
- Manufacturer: Hunan Yanji Tech Co.,Ltd
- Address: Room 21014, Unit 1, Fudixingguang plaza, Yuhua district Yingxin road, Changsha, Hunan, P.R. China
- Email: hi@yanjiiot.com
- Website: www.yanjiiot.com