Description
TRICONEX 4351B Core Technical Parameters
- Brand: TRICONEX
- Model: 4351B
- Input Voltage: 24V DC (Allowable Fluctuation Range: 20.4V DC – 28.8V DC)
- Number of Channels: 16 channels, supporting single-ended input
- Communication Protocol: Modbus RTU, supporting RS-485 interface (baud rate: 9600-115200 bps)
- Input Type: Digital Input (DI), compatible with NPN/PNP and dry contact
- Response Time: Maximum 8ms (from input signal change to communication output)
- Operating Temperature: -40℃ ~ +70℃ (Industrial Grade Wide Temperature Design)
- Protection Level: IP20 (DIN Rail Mount, Dustproof)
- Power Consumption: Typical 5W, Maximum 7.2W
- Mounting Method: 35mm Standard DIN Rail Mount
- Isolation Voltage: 2500V AC (input to power supply, input to communication ports)

TRICONEX 4351B
Compatibility Classification (Three Levels):
- Drop-in Replacement: Hardware interface, firmware, and configuration are fully compatible; no any modifications required.
- Software Compatible: Hardware interface is the same, but program re-download or firmware upgrade is required.
- Hardware Modification Required: Wiring modification, terminal replacement, or rack adjustment is needed.
Replaceable Models:
✅ Drop-in Replacement (No Modifications Required)
- TRICONEX 4351B → TRICONEX 4351B-R
- Differences: Industrial reinforced version, enhanced anti-interference performance and dustproof design; all other parameters are fully compatible with the original model.
- Note: Firmware version ≥ V4.0 is required; old firmware versions can be upgraded directly without additional operations.
- Price: Approximately 15% higher than the original model.
⚠️ Software Compatible (Reconfiguration Required)
- TRICONEX 4351B → TRICONEX 4352B
- Differences: Enhanced data processing speed (improved by 35%), added real-time fault self-diagnosis function; hardware interface is consistent with the original model.
- Steps:
- Export the engineering file of TRICONEX 4351B.
- Create a new engineering file for TRICONEX 4352B in the configuration software.
- Import the original engineering parameters and recompile the program.
- Download the compiled program to the new module and restart it.
- Workload: About 1-2 days, depending on the complexity of the program.

TRICONEX 4351B
❌ Hardware Modification Required (Not Recommended)
- TRICONEX 4351B → TRICONEX 5351B
- Reason: It belongs to a new generation of product lines, with different rack specifications, terminal definitions and programming environments; it is completely incompatible with the original hardware and software.
- Cost: Need to replace the entire rack, rewire all terminals and rewrite the program; the total cost is more than 180% higher than the original model.
- Recommendation: Not recommended unless the entire control system is upgraded.
TRICONEX 4351B Series Other Recommended Models
| Series Model | Product Function Introduction |
|---|---|
| TRICONEX 4351C | It is an enhanced version of TRICONEX 4351B, adding Ethernet communication interface, supporting Modbus TCP protocol, and improving data transmission efficiency; suitable for large-scale industrial automation systems that require high-speed communication. |
| TRICONEX 4351D | Focus on low-power design, with typical power consumption reduced to 3.8W, while maintaining the same core functions as TRICONEX 4351B; suitable for industrial scenarios with limited power supply. |
| TRICONEX 4351E | Integrated high-precision signal filtering function, which can effectively reduce interference from external signals, improve data collection accuracy, and is suitable for harsh industrial environments with strong electromagnetic interference. |


