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Siemens 6ES7321-7RD00-0AB0 Programmable Logic Controller
The Siemens 6ES7321-7RD00-0AB0 Programmable Logic Controller provides 4 NAMUR digital inputs with 24 V DC operation and optical isolation. It supports Ex(i) intrinsic safety, diagnostics for wiring or signal deviations, and a time delay between 0.1 and 20 ms. The module measures 40 × 125 × 120 mm and weighs 0.23 kg. It integrates directly with Siemens automation, aligns with the Siemens PLC platform, and belongs to the Simatic S7-300 series.
| Brand | Siemens |
| Product Type | Programmable Logic Controller (PLC) |
| Product | 6ES7321-7RD00-0AB0 |
Siemens 6ES7321-7RD00-0AB0 Programmable Logic Controller – Technical Specifications
| Specification | Value |
|---|---|
| Product Description | SIMATIC S7, digital input SM 321, isolated, 4 DI; 24 V DC, NAMUR/DIN 19234, for signals from the hazardous area, diagnostics-capable, PTB tested |
| Product family | Ex digital input modules |
| Product Lifecycle (PLM) | PM400:Phase Out Started |
| Net Weight (kg) | 0,309 Kg |
| Packaging Dimension | 13,20 x 14,70 x 5,10 |
| Package size unit of measure | CM |
| Country of origin | Germany |
The Siemens 6ES7321-7RD00-0AB0 Programmable Logic Controller digital input module features 4 NAMUR inputs, 24 V DC operating range, and optically isolated channels. The Siemens 6ES7321-7RD00-0AB0 belongs to the Simatic S7-300 series and supports Ex(i) intrinsic safety, enabling reliable operation in hazardous-area signal environments. Its 0.1–20 ms delay range and compact 40 × 125 × 120 mm structure make it suitable for industrial automation tasks requiring safe signal acquisition.
This module is used in conveyors, packaging lines, robotic stations, and automation processes where NAMUR sensors monitor speed, position, and equipment status. Its stable response and isolation ensure clean signal transitions, fault-resistant operation, and dependable wiring diagnostics. These capabilities support consistent field-device integration across assembly lines, material-handling systems, and safety-interlocked machinery.
The Siemens 6ES7321-7RD00-0AB0 offers dependable NAMUR input processing, intrinsic safety support, and stable 24 V DC operation for long-term industrial use. Its integration into the Simatic S7-300 architecture ensures compatibility, durability, and reliable signal interpretation across demanding environments. With proven Siemens engineering and diagnostic features, it remains a trusted choice for process monitoring and hazardous-area input applications.
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