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Y301-880 I/O Module Specification
Unified Modbus & Automation Reference: Y301 Series Modbus Technical Manual
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
Y301-880 is the flagship of the Y301 family, combining eight optically isolated digital inputs and eight high-power relay outputs in a 145 × 90 × 40 mm enclosure. It delivers maximum Modbus-RTU I/O density for PLC expansion, building automation, and large-scale telemetry systems.
| Model | DI | DO | AI | Typical Role |
|---|---|---|---|---|
| Y301-880 | 8 | 8 (SPDT) | – | Multi-zone digital automation |
Positioning Highlights
- Largest I/O count in the Y301 series for pure digital control
- Independent indicators for all 16 channels plus system status LEDs
- Robust automation firmware with 16 linkage rules and DO retention
2. Ordering Information
2.1 Model Naming
Y301-880-IF
- IF → Interface option: RS485 (default), RS232, or TTL
2.2 SKU Matrix
| SKU | Interface | Description |
|---|---|---|
| Y301-880-RS485 | RS485 | Multi-drop bus deployment |
| Y301-880-RS232 | RS232 | Point-to-point / HMI integration |
2.3 Package Contents
Module, digital quick reference, warranty leaflet. Optional accessories: DIN clips, USB-RS485 converter, 24 VDC supply, shielded RS485 cabling kit.
3. Key Features
- 16-Point Digital I/O – Eight dry/wet DI channels plus eight SPDT relay outputs.
- High-Power Relays – AC 277V/10A or DC 28V/10A per channel with independent COM/NO/NC terminals.
- Automation Engine – Up to 16 linkage rules (two per DO) covering follow, pulse, timer, logic, and schedule modes.
- Scalable Addressing – Software Modbus address 1–255 plus 5-bit DIP offset (0–31) for panel deployments.
- Industrial Build – 5–36V DC input, -40°C~85°C, hardware watchdog, reload button, surge-protected communications.
4. Technical Specifications
4.1 Electrical & Environmental
| Parameter | Specification |
|---|---|
| Supply Voltage | DC 5~36V |
| Typical Current | 260 mA @ 12V |
| Max Current | 350 mA @ 12V (all relays energized) |
| Operating Temperature | -40°C ~ +85°C |
| Humidity | 5~95% RH, non-condensing |
4.2 Digital Inputs
| Item | Specification |
|---|---|
| Channels | 8 |
| 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 per channel |
| Debounce | 5–255 ms (default 50 ms) |
4.3 Digital Outputs
| Item | Specification |
|---|---|
| Channels | 8 × SPDT relays |
| 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 |
4.4 Communication
| 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 | Description |
|---|---|
| Power | V+, V- screw terminals + DC 5.5×2.1 mm jack |
| DIP Switch | SW1–SW5 (binary address offset) |
| Reload | Hold 3–15 s to restore factory defaults |
| DI | COM+, COM-, DI1~DI8 |
| DO | NCn / COMn / NOn for channels 1–8 |
| Communication | A/B/GND (RS485) or TX/RX/GND (RS232/TTL) |
5.2 Wiring Guidance
- Use 20–16 AWG power wiring with an upstream 2 A fuse.
- Dry DI: bridge COM+ to DI through contact closure; wet DI: external 5–36V referenced to COM-.
- DO: add RC snubbers (AC) or flyback diodes (DC) for inductive loads; keep loads within relay ratings.
- RS485: shielded twisted pair, 120 Ω termination at both bus ends with common reference ground.
6. Mechanical & Environmental
| Item | Value |
|---|---|
| Dimensions | 145 × 90 × 40 mm |
| Mounting | 35 mm DIN rail clip or screw slots |
| Protection | IP20 |
| Enclosure | UL94 V-0 flame-retardant plastic |
Maintain ≥20 mm clearance above/below, ≥10 mm at sides, and ≥60 mm at the front for wiring and airflow.
7. Automation & Linkage Rules
| Mode | Description |
|---|---|
| DI Follow | DO mirrors one or more DI states |
| Pulse Output | Configurable ON/OFF pulse widths |
| Delay Control | Programmable on/off delays |
| Cyclic Toggle | Periodic ON/OFF cycling |
| Timer / Schedule | Calendar-based activation window |
| Button Mode | Momentary pushbutton behavior |
| Logic Mode | AND/OR/XOR combinations |
| Watchdog Mode | Auto-reset DO if DI timeout occurs |
- 16 rules maximum (2 per DO channel)
- Rules execute locally without host polling
- DO retention stores last automation state if 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