Siemens Siwarex WP321 Weighing electronic, 1 channel Part number 7MH4138-6AA00-0BA0

Product Overview

The Siemens 7MH4138-6AA00-0BA0 is a **SIWAREX WP321 ST** single-channel weighing module designed for seamless integration into the **SIMATIC ET 200SP** distributed I/O system. It interfaces directly with strain-gauge full-bridge load cells (1–4 mV/V), converting analog weight signals into precise digital data for automation and process control. With built-in diagnostics, compact construction, and direct communication through ET 200SP, it is ideal for platform, hopper, tank, or force-measurement applications.

Key Features

• Single-channel weighing module for ET 200SP
• Supports full-bridge strain-gauge load cells (1–4 mV/V)
• Integrated weighing electronics for accurate digital signal conversion
• RS-485 interface for configuration or external display devices
• Load-cell diagnostics available (overload, wire break, underload, sensor fault)
• Compact 15 mm module width — space-saving within ET 200SP racks
• I&M data levels I&M0 to I&M3 supported for traceability and maintenance
• Simple plug-in integration via ET 200SP base unit A0
• Suitable for static weighing, batching, tank level, and force measurement

Technical Specifications

• Article Number: 7MH4138-6AA00-0BA0
• Product Type: SIWAREX WP321 ST weighing module
• System Compatibility: SIMATIC ET 200SP (requires BU-type A0)
• Load-Cell Input: 1–4 mV/V, full-bridge strain-gauge type
• Interface: RS-485 for configuration/communication
• Power Supply: 24 V DC (standard ET 200SP supply)
• Module Width: approx. 15 mm (slim design)
• Net Weight: approx. 0.040 kg
• Functions: Weight measurement, load-cell diagnostics, digital conversion, force measurement
• Typical Applications: Platform scales, hopper/tank scales, batching systems, level monitoring via weight, belt scales, force sensors

Compliance & Standards

• Designed for industrial weighing and automation environments
• Conforms to ET 200SP mechanical and electrical interface standards
• Supports industrial EMC and noise-resistance requirements
• Compatible with strain-gauge load-cell standards (full-bridge, mV/V systems)

Applications

The module is ideal for weighing and process-measurement applications integrated directly into ET 200SP automation systems. It is suitable for hopper and tank scales, level-by-weight systems, batching processes, packaging machinery, platform scales, conveyor weighing, and force-measurement installations. Its compact form and diagnostics make it well-suited for industrial environments requiring reliable and precise weighing integration.