The Siemens 6ES7421-1BL01-0AA0 serves as a high-performance analog input module for the renowned SIMATIC S7-300 series. We engineered this SM 331 unit to deliver accurate signal acquisition from various field devices. Its isolated design ensures reliable operation by protecting against ground loops and electrical interference. Consequently, this module provides consistent performance in demanding industrial environments.
Technical Specifications and Key Features
Understanding the exact technical attributes of the Siemens 6ES7421-1BL01-0AA0 is essential for proper system configuration. We have designed this module to meet stringent industrial standards for precision and durability. Its compact form factor integrates seamlessly into existing S7-300 rack configurations. The table below details its core design and operational capabilities.
| Specification | Details |
|---|---|
| Model Number | 6ES7421-1BL01-0AA0 |
| Product Type | SIMATIC S7-300, Analog Input Module SM 331 |
| Input Channels | 2 analog inputs (isolated) |
| Resolution | 9 / 12 / 14 bits (configurable) |
| Measurement Types | Voltage, current, thermocouple, resistor |
| Supply Voltage | Load voltage L+ 24 V DC (rated) |
| Reverse Polarity Protection | Yes |
| Current Consumption (max) | 30 mA from L+; 50 mA from 5 V DC backplane bus |
| Power Loss (typ) | 1 W |
| Input Destruction Limits | 20 V DC continuous (voltage); 40 mA (current) |
| Connector | 1x 20-pole front connector |
Advanced Input Capabilities and Diagnostics
This Siemens 6ES7421-1BL01-0AA0 module excels in handling multiple signal types with configurable resolution. You can connect voltage, current, thermocouple, or resistance sensors directly to its two isolated inputs. For resistance measurements, it provides a constant current of 1.67 mA typically. Additionally, the module supports comprehensive alarm and diagnostic functions for proactive maintenance.
The 6ES7421-1BL01-0AA0 also features robust input protection against overvoltage and overcurrent conditions. It withstands up to 75 V for one second on voltage inputs with a specific duty cycle. Therefore, you can rely on it for applications where signal integrity and module safety are paramount. Its isolated design further enhances measurement accuracy in mixed-signal environments.
Seamless Integration with SIMATIC S7-300
As a dedicated component of the Siemens SIMATIC S7-300 family, the 6ES7421-1BL01-0AA0 offers unmatched compatibility. You can install or remove it while the backplane bus remains active, minimizing system downtime. This hot-swapping capability proves invaluable during maintenance or system expansion. The module adheres to the strict quality standards associated with the Siemens automation portfolio.
We recommend pairing this SM 331 module with a compatible S7-300 power supply and CPU. Its 20-pole front connector supports easy field wiring for all signal types. Always verify the firmware version to access all resolution settings and diagnostic features. The Siemens 6ES7421-1BL01-0AA0 represents a reliable choice for precision analog signal acquisition.
Details
| Weight | 1.2 kg |
|---|---|
| Dimensions | 50 × 290 × 217 mm |
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