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Siemens SIMATIC S7-300 Digital Input Module 6ES7321-1BH0-0AA0 Continues to Serve the Industrial Automation Market

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Siemens SIMATIC S7-300 Digital Input Module 6ES7321-1BH0-0AA0 Continues to Serve the Industrial Automation Market Jan 26, 2026

Siemens SIMATIC S7-300 Digital Input Module 6ES7321-1BH02-0AA0 Continues to Serve the Industrial Automation Market


With the continuous improvement of reliability and scalability requirements in industrial automation, the classic module SIMATIC S7-00 digital input module 6ES7321-1BH02-0AA0 in Siemens' industrial automation product line continues to play a key role manufacturing, energy, transportation, and automation control systems. As an important expansion component of the S7-300 system, this module provides stable and reliable digital input capabilities for device status acquisition and is one of the industrial field control solutions well-known to many engineers.


Core Module Introduction
6ES7321-1BH020AA0 is a standard digital input module in the SIMATIC S7-300 series, featuring the following basic characteristics:
16 digital input channels, suitable signal acquisition from standard switches, sensors, and other devices.

Supports 24 V DC operating voltage (allowable range approximately 20.4 – 2.8 V DC).
Features potential isolation design, enhancing signal anti-interference capability and improving on-site reliability.

Compact size design (approximately 15 × 40 × 120 mm), convenient for installation in control cabinets.
This module seamlessly connects to the S7-300 PLC system the backplane bus, expanding the digital input capabilities of the control system and providing more flexible I/O configuration options for complex automation scenarios.

Product Lifecycle Status
It worth noting that the SM 321 digital input series, to which the 6ES7321-1BH02-0AA0 belongs, has entered Product Lifecycle Management (PLM PM400) phase and has been in the announced phase of phase-out since October 1, 2023. This that the module is still available for purchase and support, but it will gradually be replaced by new product solutions in the future.

Despite being in the phase-out stage of its product life cycle, the 6ES7321‑1BH2‑0AA0 remains an indispensable key component in many legacy or long-term operating equipment systems, due to its extensive deployment in global industrial control systems. Engineers still frequently encounter model during maintenance, spare parts management, and system expansion.

Market and Application Dynamics
In the current market environment, this module continues to maintain stable demand, particularly in scenarios the replacement of aging devices, supporting long-term operation of S7‑300 systems, and in field control projects with high reliability requirements. Distributors and supply chain channels provide original stock versions and spare parts services, catering to the practical needs of enterprises to extend the life cycle of equipment.

Moreover, many automation projects in the industry are based on the cost-effective S7‑300 platform, making the 6ES7321‑1BH02‑0AA0 not only a technical spare but also a safeguard resource for maintaining long-term stable production.

Summary and Outlook
As a classic digital input module of the SIMATIC S7‑300, the 6ES7321‑1BH02‑0AA0 continues to play an important role in industrial automation systems. Although the product has entered the phaseout stage, its mature and reliable performance, extensive application base, and deep market foundation make it still of significant value at this stage. Looking ahead, with the advancement of automation upgrades personnel training, it is recommended that automation practitioners plan for phase-out replacement schemes in advance, while also making spare parts reserves for existing modules, to ensure the long-term operation of automation systems.
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