Y301-220/222 I/O Module Specification

Y301-220	Y301-222

• Y301-220/222 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
8. Modbus Address Quick Map

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1. Overview

The Y301-220/222 are high-power serial I/O expansion modules that combine opto-isolated digital inputs, 10 A relay outputs, and, on the Y301-222, dual analog inputs for 0-10 V or 4-20 mA sensing.

Both models support Modbus RTU over RS485, RS232, or TTL and can be integrated with PLCs, SCADA systems, and industrial gateways.

Model	Digital Input	Digital Output	Analog Input	Typical Role
Y301-220	2	2 x SPDT	-	Equipment monitoring and control
Y301-222	2	2 x SPDT	2 (0-10 V / 4-20 mA)	Process monitoring and control

Analog input is available on the Y301-222 only.

Product Highlights

• 82 x 54 x 32 mm enclosure with DIN-rail and screw mounting options
• 277 VAC / 10 A relay contacts for HVAC, lighting, and pump control
• Built-in automation engine with local rules, DO retention, and DIP address offset

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2. Ordering Information

2.1 Model Naming

Y301-XYZ

• XYZ: function combination (220 = 2DI + 2DO + 0AI, 222 = 2DI + 2DO + 2AI)

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 Ordering Table

SKU	Description
Y301-220	2 DI + 2 DO, high-power relay module
Y301-222	2 DI + 2 DO + 2 AI, combo I/O module

2.4 Standard Package

1 x Y301 module, digital quick reference guide, and warranty card.

Optional accessories include a USB-to-RS485 converter, DIN clip, power supply, and shielded cable set.

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3. Key Features

1. High-power relay outputs - 277 VAC / 10 A or 28 VDC / 10 A silver-alloy contacts
2. Opto-isolated DI with pulse counting - Rising/falling edge capture with configurable debounce from 5 to 255 ms
3. Analog input on Y301-222 - Two channels supporting 0-10 V or 4-20 mA, 16-bit resolution, and +/-1% FS accuracy
4. Automation engine - Up to 4 local rules covering follow, pulse, delay, schedule, cycle, AI threshold, and logic modes
5. Output retention and addressing - Configurable retention plus 5-bit DIP offset on top of the software address
6. Industrial design - 5-36 VDC input, -40 to +85 C operation, hardware watchdog, and Reload button

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4. Technical Specifications

4.1 Electrical and Environmental

Parameter	Specification
Supply voltage	5-36 VDC
Typical current	150 mA @ 12 V (all DO off)
Maximum current	200 mA @ 12 V (two relays on + AI sampling)
Operating temperature	-40 to +85 C
Humidity	5-95% RH, non-condensing
Altitude	<= 2000 m

4.2 Digital Input (2 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 (2 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 / power-cycle retention

4.4 Analog Input (Y301-222, 2 channels)

Item	Specification
Input type	0-10 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
Supported function codes	0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x0F, 0x10
Baud rate	600-230400 bps (default 9600)
Addressing	Device address 1-255 + DIP offset 0-31
Frame format	[slave][function][data][CRC low][CRC high]

4.6 Factory Defaults

Parameter	Default
Device address	1
Baud rate	9600
Data bits / Stop bits / Parity	8 / 1 / None
Output retention	Soft reboot retention (0x0040 = 1)
Pulse count mode	Rising edge (0x0041 = 1)
Pulse debounce	50 ms (0x0042 = 50)

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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-DI2
DO	NCn / COMn / NOn for channels 1-2
AI (222 only)	AI1+, AI1-, AI2+, AI2-
Communication	A/B/GND (RS485) or TX/RX/GND (RS232/TTL)

5.2 Wiring Guidelines

• Use 20-16 AWG power wiring with a 1 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 Y301-222 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	Value
Dimensions	82 x 54 x 32 mm
Mounting	35 mm DIN clip or screw slots
Protection	IP20
Housing	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 Group	Description
Follow	DI follow, DI inverse, delayed follow
Pulse / Delay	Pulse output, delayed control
Time-based	One-shot schedule, cyclic schedule, daily schedule, startup delay action
AI threshold (222)	AI voltage high/low, AI current high/low
Logic	AND / OR / XOR
Others	Button mode, periodic cycle

• Up to 4 rules total (2 rules per DO channel)
• Rule register base is 0x0080, each rule occupies 8 registers (16 bytes)
• Rules execute locally without host polling
• If multiple rules conflict, later rules take priority

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8. Modbus Address Quick Map

This section uses Modbus addresses only (0xXXXX), not PLC addresses.

8.1 DI / DO / AI

Type	Channel	Modbus Address	Access
DI	DI1	0x0000	RO
DI	DI2	0x0001	RO
DO	DO1	0x0000	RW
DO	DO2	0x0001	RW
AI (222)	AI1 voltage	0x0000	RO
AI (222)	AI1 current	0x0001	RO
AI (222)	AI2 voltage	0x0002	RO
AI (222)	AI2 current	0x0003	RO

8.2 Key Holding Registers

Address	Name	Access	Notes
0x002A	Running slave address	RO	Device address + DIP offset
0x002B	DIP offset address	RO	0-31
0x003E	Device address	RW	1-255
0x003F	Broadcast mode	RW	0/1/2
0x0040	Output retention mode	RW	0/1/2
0x0041	Pulse count edge mode	RW	0=falling, 1=rising
0x0042	Pulse debounce (ms)	RW	5-255
0x0055	RTC time (Unix)	RW	32-bit
0x0057	Baud rate	RW	32-bit
0x0059	Data bits	RW	8/9
0x005A	Stop bits	RW	1/2
0x005B	Parity	RW	0=None, 1=Odd, 2=Even

8.3 Counters, Rule Blocks, and Special Register

Address	Name	Notes
0x0500	DI1 counter	32-bit, write 0 to clear
0x0502	DI2 counter	32-bit, write 0 to clear
0x0080	Rule block 1	8 registers per rule
0x0088	Rule block 2	8 registers per rule
0x0090	Rule block 3	8 registers per rule
0x0098	Rule block 4	8 registers per rule
0x0800	Special register	0x5500 reboot, 0x0055/0x5555 factory reset + reboot

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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