SIEMENS 421-1B01-0AA0 Simatic Digital 6ES7 S7-400 SM421 345240

( Brand: Siemens ), ( Manufacturer Part Number: 421-1B01-0AA0 ), ( Part Type: Digital )

Review SIEMENS Simatic Digital Input #345240

Siemens SIMATIC S7-400 Digital I/O Module SM421 (421-1B01-0AA0, 345240)

The Siemens SIMATIC S7-400 Digital I/O Module SM421 (421-1B01-0AA0, 345240) is a high-performance, versatile, and reliable solution for industrial automation applications. This digital input/output (I/O) module, specifically designed for the Siemens S7-400 PLC (Programmable Logic Controller) series, offers a robust and efficient means of interfacing with various field devices such as sensors, actuators, and motors.

The SM421 I/O module is a 34-point device, featuring 32 digital inputs and 2 digital outputs, each with a voltage rating of 24V DC. The module integrates seamlessly with the S7-400 system, ensuring rapid and accurate data exchange. With a communication speed of up to 10 kHz, the SM421 ensures fast response times, minimizing latency and maximizing system efficiency.

The SM421 is built with high-quality components, ensuring a long service life and exceptional reliability. It is designed to operate in harsh industrial environments, with a wide operating temperature range (-30 C to 70 C) and a high resistance to electromagnetic interference (EMI). The module is also equipped with diagnostics features, providing real-time feedback on the health of the I/O points and the overall module status.

The Siemens SIMATIC S7-400 Digital I/O Module SM421 (421-1B01-0AA0, 345240) is an ideal choice for a wide range of applications, including manufacturing, packaging, transportation, and building automation. Its combination of high performance, robustness, and ease of integration makes it a valuable addition to any industrial automation system.

This Siemens S7-400 Digital SM421 is a programmable logic controller (PLC) designed for medium to large-scale industrial automation applications. Here are some pros and cons to consider when deciding whether to purchase this PLC:

1. **Reliability:** Siemens is a well-known and reputable manufacturer in the industrial automation industry, and the S7-400 series is widely recognized for its high-quality and reliability.

2. **Scalability:** The S7-400 series offers a broad range of CPU and I/O modules, allowing users to scale the system to meet their specific application requirements.

3. **Integration:** Siemens PLCs are highly compatible with other Siemens automation products, such as SIMATIC Drive, SIMATIC IT, and SIMATIC HMI. This allows for seamless integration and communication within a manufacturing system.

4. **Programming Flexibility:** The S7-400 series supports multiple programming languages, including STEP 7, TIA Portal, and IEC 61131-3. This allows users to choose the language that best suits their needs and preferences.

5. **Extensive Support:** Siemens provides extensive documentation, training, and technical support for its products, ensuring that users can effectively troubleshoot and maintain their systems.

1. **Cost:** Siemens PLCs generally have a higher price point compared to other PLC manufacturers. The S7-400 series, in particular, is considered a premium choice, which may be a significant factor for some users.

2. **Complexity:** The S7-400 series offers a wide range of features and functions, which can make it somewhat complex for users new to automation or PLCs in general.

3. **Proprietary Software:** While Siemens' TIA Portal software is powerful and feature-rich, it is proprietary and may not be compatible with third-party software or tools.

The Siemens SIMATIC S7-400 Digital SM421 is a high-quality, reliable, and scalable PLC designed for medium to large-scale industrial automation applications. Its extensive range of features, compatibility with other Siemens products, and strong technical support make it an attractive choice for many users. However, its premium price point and potential complexity may be a concern for some, particularly for those new to automation or PLCs.

If budget is not a concern and the user requires a high-performance, scalable PLC for a demanding industrial automation application, the Siemens SIMATIC S7-400 Digital SM421 is an excellent choice. However, if cost is a concern or the user is new to automation, it may be worth considering other PLC manufacturers or lower-tier Siemens PLCs before making a final decision.

Details:

MANUFACTURER PART NUMBER: 6ES7 421-1B01-0AA0. SIMATIC S7-400 DIGITAL INPUT SM421. SIEMENS 6ES7 421-1B01-0AA0. 32 DIGITAL INPUTS.

part #: 4211b010aa0 prices

• $49.38-$316.79

specifications sensoindustria:

• brand: Siemens
• mpn: 421-1b01-0aa0
• part type: Digital

returns sensoindustria:

• policy: No Returns

general sensoindustria:

• PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules
• condition: Used

seller sensoindustria:

• city: Clinton Township, Michigan
• rating: 99.8%
• # reviews: 19490

payments sensoindustria:

• credit card: Visa
• other
• wallet: Apple-pay

shipping sensoindustria:

• type: Calculated
• transit: 2-4 Days
• carrier: FedEx, UPS, USPS
• class: Standard, Expedited, One-day
• cost: $20.17
• service: FedEx Ground / FedEx Home Delivery, UPS Ground, USPS Priority Mail, FedEx Standard Overnight

offer sensoindustria:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• quantity: 76
• started: October 28, 2025
• best offers: True

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