Product Details
Product Overview
The 4351A Terminal Communication Module (TCM) acts as the primary communication bridge for high-availability industrial control systems. It facilitates seamless data exchange between the controller and external networks via dual copper Ethernet ports. This module integrates critical diagnostic protocols and high-speed serial processing to ensure real-time telemetry and peer-to-peer synchronization in mission-critical environments. We supply this unit as 100% brand new and original factory stock.
Technical Specifications
| Feature | Specification |
| Network Interface | 2 x 10/100BaseT Ethernet (RJ-45) |
| Serial Ports | 4 x RS-232/RS-485 (DB-9) |
| Port Isolation | 500 VDC |
| Protocol Support | Modbus TCP/IP, TSAA, TriStation, SNTP, Jet Direct |
| Serial Speed | Up to 115.2 Kbps per port |
| Power Requirement | 24V DC |
| Physical Weight | Approx. 0.5 kg |
Engineering Advantages
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Deterministic Synchronization: The NET 1 port executes hardware-level Peer-to-Peer Time Synchronization. This eliminates jitter across distributed nodes, ensuring that time-stamped events remain accurate within complex automated sequences.
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Robust Electrical Isolation: With 500 VDC isolation on communication ports, the 4351A shields the internal logic from ground loops and transient voltage spikes common in heavy industrial motor-drive environments.
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Simplified Network Printing: The native Jet Direct support allows the module to trigger automated reports and alarm logs directly to network printers, bypassing the need for an intermediate PC workstation.
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Versatile Modbus Implementation: The module supports extensive Modbus functions (01 through 16). This allows engineers to perform everything from simple coil reads to complex multiple-register presets, making it compatible with a vast array of legacy and modern SCADA systems.
FAQs
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What is the primary difference between the 4351A and the 4352A?
The 4351A utilizes copper Ethernet (RJ-45) for standard local networking, while the 4352A employs fiber-optic (MTRJ) connectors for long-distance runs or areas with extreme electromagnetic interference.
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Does the 4351A support both Master and Slave Modbus configurations?
Yes. The module supports Modbus TCP/IP in both Master and Slave modes, providing the flexibility to either pull data from field devices or report data to a higher-level HMI.
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What do the 'FIRM' and 'ACTIVE' LEDs indicate during operation?
The ACTIVE LED signals that the module is currently controlling the I/O bus, while the FIRM LED indicates the status of the resident firmware—essential for verifying successful field updates or identifying initialization errors.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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Mastering the Siemens PLC Scan Cycle: How the CPU Executes Automation Programs
Industrial automation relies heavily on programmable logic controllers (PLCs) to manage complex manufacturing processes. Many engineers dive straight into programming without mastering the underlying architecture. However, understanding how a PLC CPU executes a program ensures reliable system design. Therefore, mastering the scan cycle optimizes both performance and troubleshooting in modern control systems.
How to Connect to Siemens S7 PLCs: 5 Essential Communication Methods
Establishing a reliable hardware link between a programming terminal and a Siemens SIMATIC controller is essential for engineering workflows. Field engineers rely on distinct physical layers, ranging from legacy serial connections to high-speed Industrial Ethernet protocols. Modern factory automation environments prioritize fast data transfer and seamless driver integration. Selecting the correct connection method simplifies program downloads, online monitoring, and system troubleshooting in complex control systems.