PLCs, Power Supplies & Others

Product Overview

The Siemens 7TM3401-3/CC functions as a specialized printed circuit board assembly for industrial automation equipment. This board provides essential control, interface, or signal conditioning functions within Siemens systems. We engineered the 7TM3401-3/CC to meet rigorous industrial standards for reliability and performance in demanding environments.

Technical Specifications

Key Features and Benefits

• High-Quality Board Construction: The 7TM3401-3/CC uses 6-layer FR-4 material with dedicated power and ground planes. This construction ensures signal integrity and reduces electromagnetic interference in sensitive industrial applications.

• Mixed Technology Assembly: Surface mount components provide high-density functionality while through-hole connectors ensure mechanical robustness. Consequently, the board offers both advanced features and reliable field connections.

• Comprehensive Isolation Protection: Optical isolation separates input, output, and communication circuits from the control logic. This design prevents ground loops and protects against electrical transients from field wiring.

• Industrial Temperature Rating: All components on the 7TM3401-3/CC operate reliably from -20°C to 70°C. Therefore, the board functions correctly in unheated enclosures and near hot machinery without failure.

• Rugged Mechanical Design: The board includes multiple mounting points for secure installation in vibration-prone environments. Thick copper traces and reinforced plated-through holes resist stress from field wiring connections.

Detailed Functional Description

The Siemens 7TM3401-3/CC circuit board serves as a critical subsystem within larger automation equipment. Specifically, it processes input signals from field devices, executes control logic using its onboard microcontroller, and drives output actuators through relay contacts. The board communicates with higher-level systems through its isolated RS-485 interface, reporting status and receiving commands. Furthermore, onboard memory stores configuration parameters and maintains operational data through power cycles.

Component Layout and Key Functions

We designed the 7TM3401-3/CC with functional blocks arranged for optimal performance:

• Power Supply Section: Input filtering, transient suppression, and multiple voltage regulators (5V, 3.3V, 24V isolation)

• Microcontroller Unit: 32-bit processor with integrated memory and peripherals

• Digital Input Section: Optocouplers with programmable thresholds and LED indicators

• Output Section: Relay drivers with freewheeling diodes and status LEDs

• Communication Section: RS-485 transceiver with surge protection and termination options

• Memory Section: Flash for program storage, SRAM for data, EEPROM for configuration

Manufacturing and Quality Standards

Siemens manufactures the 7TM3401-3/CC to the highest quality standards in the industry. The assembly process includes:

• Automated optical inspection (AOI) after solder paste deposition

• X-ray inspection of hidden joints (BGAs, QFNs)

• In-circuit testing (ICT) for component verification

• Functional testing under load at temperature extremes

• Conformal coating application for environmental protection

Mechanical and Installation Details

The Siemens 7TM3401-3/CC mounts inside control cabinets using four M3 standoffs. Its layout provides clear access to all connectors and test points for maintenance. Key mechanical features include:

• Mounting Holes: Four plated-through holes with 3.2 mm diameter

• Mounting Pattern: 150 mm x 90 mm rectangular pattern

• Connector Locations: All connectors positioned on one edge for easy access

• Test Points: Dedicated pads for oscilloscope probes and multimeter connections

• Component Clearance: 10 mm minimum height above mounting surface

Common Applications

The 7TM3401-3/CC circuit board serves as a building block in various Siemens automation products:

Why Choose This Board?

Selecting the Siemens 7TM3401-3/CC means choosing a proven, reliable circuit board for your industrial application. This board incorporates decades of Siemens engineering experience in harsh environments. You benefit from robust isolation, wide temperature operation, and comprehensive testing that field-assembled circuits cannot match. The mixed technology construction provides both advanced functionality and reliable field connections. For OEMs building automation equipment or end users maintaining existing systems, the 7TM3401-3/CC delivers the quality and reliability you expect from Siemens.

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