Y301-110/200/020 Serial I/O Modules Specification

Y301-110	Y301-200	Y301-020

• User Manual
• 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

1. Overview

Y301-110/200/020 modules acquire digital inputs and control relay contacts over Modbus RTU. RS485 is standard; RS232 and selected TTL versions are ordering options.

Model	Digital Input (DI)	Digital Output (DO)	Typical Use Case
Y301-110	1	1	Local alarm input and actuator control
Y301-200	2	0	Dual-channel status monitoring and pulse counting
Y301-020	0	2	Dual relay control for pumps or valves

Product Highlights

• Compact DIN-rail or panel-mount form factor for dense control cabinets
• Industrial 5-36 VDC input with reverse-polarity protection
• One or two digital I/O channels for equipment controllers and gateways

2. Ordering Information

2.1 Model Configuration

The I/O code follows DI / DO / AI / AO. These are channel counts on one module; the fourth position is omitted on models without AO.

Model	DI	DO	AI	AO
Y301-110	1	1	0	0
Y301-200	2	0	0	0
Y301-020	0	2	0	0

For the full code and examples, see Model Naming.

2.2 Interface Options

Specify the required interface when ordering:

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
Y301-110	1 DI + 1 DO, Modbus RTU
Y301-200	2 DI, input-only module
Y301-020	2 DO, output-only module

3. Key Features

1. Enclosure - 77.4 × 22.5 × 16.2 mm for space-constrained installations
2. Flexible configuration - Three model variants cover common digital I/O requirements
3. Modbus RTU ready - RS485/RS232/TTL interface options simplify system integration
4. Power and operating environment - 5-36 VDC input and -40 to +85 °C operating range
5. Opto-isolated inputs - Supports both dry contact and wet contact signals
6. Relay outputs - Rated up to 125 VAC / 0.5 A or 30 VDC / 2 A
7. Pulse counting - Selectable rising/falling edge and configurable debounce on DI models; Y301-200 retains accumulated counts after power loss
8. Built-in automation - Local rules on models with DO channels

4. Technical Specifications

4.1 Electrical and Environmental

Parameter	Specification
Supply voltage	5-36 VDC
Operating temperature	-40 to +85 °C
Humidity	5-95% RH

4.2 Digital Input

Item	Specification
Channel count	1 (Y301-110) or 2 (Y301-200)
Type	Dry/wet contact, opto-isolated
Sampling rate	100 Hz
Pulse counter	32-bit unsigned accumulated count, selectable rising/falling edge
Counter retention	Y301-200: accumulated counts are retained after power loss
Debounce	5-255 ms (default 50 ms)

The sampling rate is not a guaranteed maximum pulse frequency. Select debounce to suit the contact bounce and pulse timing: after a counting edge is detected, signals within the debounce interval are not counted.

Pulse Counter Registers

Read each counter with Modbus function code 0x03, requesting two consecutive 16-bit holding registers. Values use big-endian order (high word first). Writing 0 clears the counter; other write values are not allowed.

Channel	Modbus Addresses	PLC Addresses	Models
DI1	0x0500-0x0501	41281-41282	Y301-110, Y301-200
DI2	0x0502-0x0503	41283-41284	Y301-200

Setting	Modbus Address	Values
Counting edge	0x0041	0 = falling edge; 1 = rising edge
Debounce time	0x0042	5-255 ms; default 50 ms

Read or explicitly set the counting edge during commissioning to match the application.

4.3 Digital Output

Item	Specification
Channel count	1 (Y301-110) or 2 (Y301-020)
Type	SPDT relay
Contact rating	125 VAC 0.5 A / 30 VDC 2 A
Electrical life	100,000 cycles

4.4 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 configurable; default 1)
Data bits	8 or 9 (default 8)
Stop bits	1 or 2 (default 1)
Parity	None, odd or even (default none)

5. Interfaces and Pinout

5.1 Terminal Overview

Group	Y301-110	Y301-200	Y301-020
Power	+, - (5-36 VDC)	+, - (5-36 VDC)	+, - (5-36 VDC)
Reload	Hold 3-15 s to restore factory defaults	Hold 3-15 s to restore factory defaults	Hold 3-15 s to restore factory defaults
DI	DI, DI-COM	DI1, DI1-COM, DI2, DI2-COM	None
DO	NC1 / COM1 / NO1	None	NC1/NC2 / COM1/COM2 / NO1/NO2
Communication	A/B/GND (RS485) or TX/RX/GND (RS232/TTL)	A/B/GND (RS485) or TX/RX/GND (RS232/TTL)	A/B/GND (RS485) or TX/RX/GND (RS232/TTL)

5.2 Wiring Guidelines

• Power off before wiring.
• For Y301-200 dry-contact input, connect DI1-COM to the supply negative and connect the supply positive to DI1 through the external contact. Wire DI2 in the same way using DI2-COM and DI2.
• For wet-contact input, connect the signal positive to the selected DI and the signal negative to its DI-COM. Confirm the permitted input voltage for the supplied hardware before connection.
• Use the terminal markings and wiring diagram for the supplied model; larger models in the series use different DI common-terminal arrangements.
• For relay outputs driving inductive loads, add an RC snubber for AC loads or a flyback diode for DC loads.
• For RS485, use shielded twisted pair, appropriate end termination, and a common reference ground.

6. Mechanical and Environmental

Item	Value
Dimensions	77.4 x 22.5 x 16.2 mm
Mounting	DIN rail or screw mounting

7. Automation Rules

Automation rules apply to Y301-110 and Y301-020. Y301-200 has no DO channels.

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
Logic mode	AND/OR/XOR logic combination
Delayed follow	DO follows DI after a configured delay
Button mode	Configurable action triggered by DI

• Two rules per DO channel: 2 rules on Y301-110 and 4 rules on Y301-020
• Rules run locally without host polling
• DO output-state retention is not supported on these compact models. This is separate from Y301-200 pulse-counter retention.

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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: [email protected]
• Website: www.yengear.com