Comprehensive Product Summary – EX9251A‑MTCP

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### 1. Product Overview

Product Name: Modbus TCP/IP to Isolated 10 × DI, 4 × DO, 2 × Counter Module
Model: EX‑9251A‑MTCP
Series: EX‑92xx‑MTCP Digital I/O Series (Dual LAN Port)
Article Number: EX9251A‑MTCP
Manufacturer: TOPSCCC (Taiwan)
Website: [www.topsccc.com.tw](http://www.topsccc.com.tw)

The EX‑9251A‑MTCP is an industrial‑grade Ethernet data acquisition and control module designed for distributed digital I/O applications. It provides ten isolated wet‑contact digital inputs, four isolated open‑collector digital outputs, and two high‑speed differential hardware counters. The device supports Modbus/TCP and UDP protocols for open connectivity with SCADA, PLC, and HMI systems. It belongs to the EX‑92xx‑MTCP family, which features dual RJ‑45 ports with auto‑bypass protection for daisy‑chain Ethernet topologies.

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### 2. Key Features

- Mixed I/O Architecture: Combines 10 DI, 4 DO, and 2 Counter channels in one compact module for cost‑effective deployment.
- Dual Ethernet Ports: Integrated 10/100 Mbps switch with auto‑bypass protection enables daisy‑chain networking and rapid recovery (< 1 s) after power loss.
- Industrial Protocols: Fully supports Modbus/TCP over TCP/IP and UDP for open interoperability with standard automation software.
- High Isolation: 3750 Vrms optical isolation between channels and logic circuitry ensures robust operation in noisy industrial environments.
- DIO Synchronization: Mirrors local digital inputs to local or remote digital outputs (DI‑match or DI‑mismatch latch modes).
- Auto‑Off Time Mode: Configurable monostable output operation with automatic reset after a defined period.
- High/Low Delay Output: Programmable delay for transitions from low‑to‑high or high‑to‑low output states.
- Power‑On & Safe Values: User‑definable output states at startup or upon host watchdog timeout.
- Counters: Two isolated differential hardware counters up to 4.5 kHz, 32‑bit resolution with overflow flag.
- Software Integration: Compatible with TOPSCCC TCPDAQ ActiveX controls, DLL API, and Modbus OPC server.
- Web Server: Embedded HTTP server for remote monitoring and control via standard web browsers.
- DIN‑Rail or Wall Mounting: Industrial mechanical design for panel or cabinet installation.
- Wide Power Range: Operates from unregulated 10 – 30 V DC with reverse‑polarity and over‑voltage protection.
- Environmental Robustness: Operating temperature −10 °C to +70 °C, humidity 5 – 95 % RH non‑condensing.

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### 3. Technical Specifications

| Parameter | Specification |
|------------|---------------|
| Digital Inputs (DI) | 10 channels, isolated single‑ended wet contact (common source/ground) |
| Input Voltage Levels | Logic 0 = +5 – 30 V DC max; Logic 1 = ≤ +2 V DC |
| Input Impedance | 2 kΩ |
| Counter Function | 300 Hz software counter (32‑bit + overflow) |
| Isolation Voltage | 3750 Vrms |
| Digital Outputs (DO) | 4 channels, isolated open‑collector (NPN) |
| Output Voltage | +5 – 30 V DC |
| Max Load Current | 500 mA per channel |
| Pulse Output | Up to 300 Hz per channel |
| Isolation Voltage | 3750 Vrms |
| Hardware Counters | 2 channels (C0 = DI10, C1 = DI11), differential input |
| Input Range | 0 – 30 V DC |
| Frequency | Up to 4.5 kHz |
| Resolution | 32‑bit + overflow |
| Input Impedance | 2 kΩ |
| Isolation | 3750 Vrms |
| Power Supply | Unregulated +10 – +30 V DC |
| Power Consumption | 3.5 W typical |
| Ethernet Interface | Dual RJ‑45 ports, 10/100 Base‑T IEEE 802.3/802.3u, auto‑bypass |
| Supported Protocols | Modbus/TCP (TCP port 502), UDP (ASCII port 1025, Event 5168), HTTP port 80 |
| Indicators | Power LED (yellow), Link/Activity LEDs (green) |
| Isolation Protection | Optical 3750 Vrms between I/O and logic |
| Mounting | DIN‑rail or wall mount |
| Wiring | 14 – 28 AWG terminal block |
| Operating Temperature | −10 °C to +70 °C (14 °F to 158 °F) |
| Storage Temperature | −25 °C to +85 °C (−13 °F to 185 °F) |
| Humidity | 5 – 95 % RH non‑condensing |
| Atmosphere | Free of corrosive gases |

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### 4. Functionality

Operation Principle:
The EX‑9251A‑MTCP acts as a Modbus/TCP server on Ethernet networks. It acquires digital input states, counts pulses, and controls digital outputs based on commands from a Modbus client (PLC, SCADA, or PC). The module can also autonomously mirror DI states to DO channels or remote modules using DIO synchronization.

Use Cases:
- Industrial automation and process control
- Remote digital signal monitoring and machine status acquisition
- Counter and frequency measurement for sensors or encoders
- Distributed I/O expansion for PLCs via Ethernet
- Building automation, alarm systems, and energy management
- Integration with HMI/SCADA software supporting Modbus/TCP or OPC

Compatibility:
Works with any Modbus/TCP‑compliant master, including Siemens, Schneider, Allen‑Bradley, Beckhoff, and open‑source SCADA systems. Supported by TOPSCCC’s TCPDAQ ActiveX, DLL API, and Ethernet I/O Utility for Windows.

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### 5. Components & Accessories

Included in Package:
- EX‑9251A‑MTCP module (assembled with DIN‑rail clip)
- Product CD (manuals, drivers, utilities)
- Panel mounting bracket
- Quick start guide

Optional Accessories:
- External 24 V DC power supply
- Ethernet cables (Cat 5 or higher)
- Additional DIN‑rail mounting hardware

Connectors:
- Dual RJ‑45 Ethernet ports (auto‑MDI/MDIX)
- Plug‑in screw terminal blocks for I/O and power (14–28 AWG)

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### 6. Installation & Setup

Requirements:
- IBM‑compatible PC with Ethernet interface
- Windows 95 – 10 or later for configuration utility
- 10/100 Mbps Ethernet hub/switch and cables
- 10 – 30 V DC power supply (ripple < 200 mV p‑p)

Mounting Options:
- DIN‑rail or wall‑mount installation on control panels.
- Maintain adequate spacing for ventilation and wiring.

Network Configuration:
- Factory default IP = 10.0.0.1, Subnet = 255.255.255.0, Gateway = 10.0.0.1.
- DHCP disabled by default; can be enabled via utility or ASCII command.
- Each module must have a unique IP or ID number.
- INIT switch on rear panel allows restoring factory defaults.

LED Indicators:
- Power (Yellow): ON = power applied.
- Link (Green): ON = Ethernet connected; Blink = data activity.
- RJ‑45 LEDs: Yellow = speed indicator; Green = link status.

Daisy‑Chain Limitation:
Maximum segment length = 100 m between modules. Auto‑bypass ensures network continuity during power loss.

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### 7. Performance & Capabilities

- Data Rate: 10/100 Mbps Ethernet throughput.
- Response Time: Typical < 10 ms for Modbus transactions.
- Counter Frequency: 4.5 kHz hardware, 300 Hz software.
- Pulse Output: 300 Hz max per DO channel.
- Auto‑Bypass Recovery: ≈ 1 s after power failure.
- Power Consumption: 3.5 W typical at 24 V DC.
- Reliability: Dual watchdog system (module and host) prevents hang‑ups.
- Limitations: Total load current per DO channel ≤ 500 mA; total network segment ≤ 100 m between nodes.

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### 8. Standards & Compliance

- Ethernet Standards: IEEE 802.3 (10 Base‑T), IEEE 802.3u (100 Base‑TX)
- Communication Protocols: Modbus/TCP (v1.1b3 compliant), UDP/IP, HTTP Web Server
- Electrical Safety: 3750 Vrms isolation, reverse‑polarity and over‑voltage protection
- Environmental: Designed for industrial temperature and humidity ranges
- EMC/ESD Precautions: Use grounding straps and anti‑static measures in low‑humidity environments
- Software Interfaces: OPC Server for Modbus/TCP, TCPDAQ ActiveX Control, TCPDAQ DLL API
- Regulatory Compliance: Conforms to general industrial automation equipment standards (CE class A environment)

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### 9. Additional Information

Warranty:
One‑year limited warranty covering defects in materials and workmanship. Excludes damage from misuse, improper installation, or unauthorized repair.

Support & Maintenance:
TOPSCCC provides technical support, firmware updates, and downloadable utilities via its website. Out‑of‑warranty repairs are available at cost.

Software Tools:
- EXPERTDAQ Ethernet I/O Utility: Windows‑based configuration and monitoring tool (IP setup, I/O test, stream/event monitoring).
- TCPDAQ ActiveX Control: Enables integration with Visual Basic, Delphi, C++, and other ActiveX‑compatible environments.
- TCPDAQ DLL API: Comprehensive C/C++ library for TCP/UDP communication, stream/event handling, and Modbus functions.
- Web Server Interface: Built‑in HTTP pages for real‑time I/O monitoring and control through a browser.

Maintenance:
- Periodically verify terminal connections and power supply stability.
- Use surge protection and proper grounding in high‑noise environments.
- Firmware updates can be applied via the utility’s “Firmware Update” function.

Firmware & Configuration Defaults:
- IP 10.0.0.1 / Subnet 255.255.255.0 / Gateway 10.0.0.1
- DHCP Disabled, Web Server Disabled, Module ID 01, Password 00000000
- Restorable via INIT switch or software command ($AAS1).

Safety & Reliability Features:
- Dual Watchdog: Hardware module watchdog + software host watchdog.
- Safe State Control: Outputs revert to user‑defined safe values on communication failure.
- Auto‑Bypass Protection: Maintains network continuity during power loss.
- Optical Isolation: 3750 Vrms between I/O and logic circuits.

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### Summary

The TOPSCCC EX‑9251A‑MTCP is a versatile Ethernet digital I/O module engineered for industrial data acquisition and control. With ten isolated wet‑contact inputs, four open‑collector outputs, and two high‑speed counters, it provides flexible interfacing for sensors, switches, and actuators. Its dual‑port Ethernet design with auto‑bypass protection simplifies network wiring and enhances reliability. The module’s support for Modbus/TCP and UDP ensures seamless integration with existing automation systems, while advanced features such as DIO synchronization, programmable delays, and watchdog safety mechanisms make it suitable for mission‑critical applications. Robust isolation, wide power range, and industrial‑temperature operation guarantee dependable performance in harsh environments.