1. Product Overview

Product Name: TRP-C26
Model: TRP-C26
Series: TRP-C Series Digital I/O Modules
Article Number: TRP-C26
Manufacturer: Trycom Technology Co., Ltd.
Manufacturer Address: No. 35, Zhongxing Rd., Guishan Township, Taoyuan County 333, Taiwan
Contact: Tel: +886-3-350-3351 | Fax: +886-3-350-3352
Website: [www.trycom.com.tw](http://www.trycom.com.tw)

The Trycom TRP-C26 is an isolated 16-channel digital input (DI) RS-485 Modbus RTU module designed for industrial automation, monitoring, and control applications. It provides 16 optically isolated digital input channels capable of handling logic signals from 0 to 30 VDC. The module supports both ASCII and Modbus RTU communication protocols, allowing flexible integration with PCs, PLCs, and other RS-485-based control systems. With robust isolation, dual watchdog protection, and versatile mounting options, the TRP-C26 is engineered for reliable operation in demanding industrial environments.

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2. Key Features

- 16 Optically Isolated Digital Inputs: Each channel supports 0–30 VDC logic signals, with 3750 Vrms optical isolation to protect against voltage spikes and ground potential differences.
- Dual Communication Protocols: Supports both ASCII and Modbus RTU protocols for flexible integration with various control systems.
- Wide Power Supply Range: Operates from +10 VDC to +30 VDC, suitable for industrial power environments.
- High-Speed Communication: Baud rates configurable from 1.2 Kbps to 115.2 Kbps.
- Counter Functionality: Each of the 16 input channels can function as a 16-bit counter (0–65535) with a maximum counting frequency of 100 Hz.
- Dual Watchdog System: Includes both hardware and software watchdogs to monitor module and host operation, ensuring system reliability and automatic recovery from faults.
- LED Indicators: Individual LEDs for each input channel and a power LED provide real-time status indication.
- Flexible Mounting: Supports both DIN rail and panel mounting for easy installation in control cabinets.
- Configuration and Self-Test: External DIP switches allow users to enter configuration mode, select protocol type, restore factory defaults, and perform self-tests.
- Low Power Consumption: Maximum power consumption of 1.5 W, ensuring energy efficiency.
- Rugged Design: Built for industrial environments with wide operating temperature and humidity ranges.

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3. Technical Specifications

| Parameter | Specification |
|----------------|-------------------|
| Power Input Voltage | +10 VDC to +30 VDC |
| Power Consumption | 1.5 W (maximum) |
| Communication Interface | RS-485, differential 2-wire half-duplex |
| Supported Protocols | ASCII and Modbus RTU |
| Baud Rate Range | 1200 bps to 115200 bps |
| Data Format | 8 data bits, no parity, 1 stop bit (N,8,1) |
| Input Channels | 16 digital input channels |
| Input Voltage Range | 0–30 VDC |
| Logic Level 0 | 0–1 VDC (max) |
| Logic Level 1 | 4.0–30 VDC |
| Input Impedance | 3 kΩ |
| Optical Isolation | 3750 Vrms |
| Counter Range | 0–65535 (16-bit) |
| Counter Frequency | 100 Hz |
| Watchdog | Dual watchdog (hardware and host) |
| Indicators | Power LED, 16 channel status LEDs |
| Mounting Options | DIN rail or panel mount |
| Connectors | Screw terminals for signal and power |
| Operating Temperature | -10°C to +50°C (typical), up to +65°C in some documentation) |
| Storage Temperature | -20°C to +70°C |
| Humidity | 10–90% RH, non-condensing |
| Dimensions | 151 mm (L) × 75 mm (W) × 26 mm (H) |
| Weight | 395 g |

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4. Functionality

The TRP-C26 functions as a remote digital input acquisition module over an RS-485 network. Each of its 16 optically isolated inputs can detect logic states or count pulses from external devices such as sensors, switches, or relays. The module communicates with a host system (PC, PLC, or HMI) using either ASCII or Modbus RTU protocol.

- Input Operation: Each input channel detects voltage levels between 0 and 30 VDC. Logic “0” is recognized below 1 V, and logic “1” is recognized above 4 V.
- Counter Mode: Each input can operate as a counter channel, counting pulses up to 100 Hz. Counter values can be read, cleared, or saved to EEPROM via commands.
- Communication: The RS-485 interface allows multi-drop networking of up to 247 devices. Communication parameters (baud rate, ID, checksum) are configurable via DIP switch or software commands.
- Configuration Modes: DIP switches allow selection between ASCII and Modbus RTU modes, restoring factory defaults, or entering self-test mode.
- Self-Test Mode: Enables verification of LED indicators and communication functionality without external control.
- Dual Watchdog Function:
- Module Watchdog: Hardware-based, resets the module if internal firmware hangs.
- Host Watchdog: Software-based, monitors communication from the host. If the host fails to send periodic “Host OK!” signals, the module enters safe mode to prevent unintended operations.
- Safe Mode: When triggered, the module halts output changes until communication is restored and the watchdog is reset.

Typical Applications:
- Industrial automation and process control
- Remote digital signal monitoring
- Machine status and alarm input collection
- Building automation systems
- Energy management and environmental monitoring
- Integration with PLCs, SCADA, and DCS systems

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5. Components & Accessories

Included Components:
- TRP-C26 module unit
- Screw terminal connectors for power and signal wiring
- User manual (printed or digital)

Optional Accessories:
- External DC power adapter (10–30 VDC)
- RS-485 communication cables
- DIN rail mounting clips or brackets
- TRPCOM configuration utility (downloadable from Trycom website)

Connectors and Pin Assignments:
- Digital Inputs (DI0–DI15): 16 screw terminals for input channels
- RS-485 Interface: DATA+ and DATA– terminals
- Power Input: DC 10–30 V and GND terminals
- IN.COM: External voltage input for isolation (max 30 V)

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6. Installation & Setup

Mounting Options:
- DIN Rail Mounting: Standard 35 mm DIN rail compatible for quick installation in control panels.
- Panel Mounting: Can be fixed directly to flat surfaces using screws.

Power Connection:
- Connect DC power (10–30 VDC) to the designated screw terminals or use an external DC adapter.
- Ensure proper grounding to minimize electrical noise.

RS-485 Network Connection:
- Connect DATA+ and DATA– lines to the RS-485 bus.
- Use twisted-pair shielded cable for long-distance communication.
- Terminate the RS-485 line with 120 Ω resistors at both ends if required.

DIP Switch Configuration:
- Protocol Selection:
- OFF/OFF → Modbus RTU mode (factory default)
- OFF/ON → ASCII mode
- ON/OFF → Restore Modbus defaults
- ON/ON → Self-test mode
- Default Communication Settings:
- ID Address: 01
- Baud Rate: 9600 bps
- Data Format: N,8,1
- Checksum: Disabled

Software Configuration:
- Use TRPCOM Utility (Windows) to configure communication parameters, test inputs, and monitor data.
- The utility allows setting COM port (1–20), baud rate (1200–115200 bps), and checksum options.
- Modules can be scanned automatically to detect their IDs and communication settings.

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7. Performance & Capabilities

- Speed and Responsiveness:
The TRP-C26 supports baud rates up to 115.2 Kbps, ensuring fast data acquisition and command response.
- Counting Performance:
Each input channel can count pulses up to 100 Hz, suitable for low- to medium-speed digital signal counting.
- Reliability:
The dual watchdog system ensures continuous operation even under communication interruptions or firmware anomalies.
- Isolation and Protection:
3750 Vrms optical isolation protects both the module and connected devices from transient voltages and ground loops.
- Power Efficiency:
With a maximum power draw of 1.5 W, the module is energy-efficient and suitable for large-scale distributed systems.
- Environmental Robustness:
Designed for industrial environments with wide temperature and humidity tolerance.

Limitations:
- Input frequency limited to 100 Hz per channel.
- No analog input/output capability (digital input only).
- Requires external RS-485 master or PC for configuration and control.

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8. Standards & Compliance

- Communication Standards:
- RS-485 (EIA/TIA-485) differential half-duplex standard
- Modbus RTU and ASCII protocol compliance
- Electrical Isolation:
- 3750 Vrms optical isolation between input channels and logic circuitry
- Safety and Reliability:
- Dual watchdog system for fault recovery
- Surge and transient protection via photo-couplers
- Environmental Compliance:
- Designed for industrial temperature and humidity ranges
- Non-condensing operation up to 90% RH
- Regulatory Compliance:
- CE and FCC compliance (typical for Trycom industrial modules)
- RoHS-compliant manufacturing (lead-free components)

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9. Additional Information

Warranty:
Trycom Technology provides a limited hardware warranty covering manufacturing defects and component failures under normal operating conditions. Warranty terms may vary by region and distributor.

Technical Support:
- Email and Phone Support: Available through Trycom’s technical service department.
- Online Resources: Manuals, firmware updates, and configuration utilities available at [www.trycom.com.tw](http://www.trycom.com.tw).
- Software Tools:
- TRPCOM Utility: For configuration, testing, and monitoring.
- Modbus Poll: Third-party tool for testing Modbus RTU/ASCII communication.

Maintenance:
- Periodically inspect terminal connections for corrosion or looseness.
- Ensure proper ventilation and avoid exposure to moisture or dust.
- Firmware updates can be applied via RS-485 interface when available.

Firmware and Configuration Management:
- Module ID, baud rate, and data format stored in EEPROM.
- Configuration can be reset to factory defaults via DIP switch or command.
- Counter values can be saved to EEPROM to retain data after power loss.

Software Integration:
- Compatible with Modbus-compatible SCADA, PLC, and HMI systems.
- ASCII command set allows direct control via serial terminal or custom software.
- Example commands include reading input status, clearing counters, and enabling watchdogs.

Example Use Case:
In a factory automation system, the TRP-C26 can be used to monitor 16 discrete sensors (e.g., limit switches, proximity sensors, or push buttons). The module transmits input states to a central PLC via RS-485 Modbus RTU. Each input can also count pulses from flow meters or encoders. The dual watchdog ensures that if communication is lost, the system enters a safe state until restored.

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Summary

The Trycom TRP-C26 Isolated 16-Channel Digital Input RS-485 Modbus RTU Module is a robust, versatile, and reliable solution for industrial digital signal acquisition. With its combination of optical isolation, flexible communication protocols, and dual watchdog protection, it ensures safe and stable operation in distributed control systems. Its compact form factor, low power consumption, and easy configuration make it ideal for integration into automation, monitoring, and data acquisition applications across manufacturing, building management, and process control industries.