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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 6ES7421-1EL00-0AA0 |
| Alternative Part Number | 6ES74211EL000AA0 |
| Manufacturer | Siemens |
| Part Category | PLC Systems |
| Part Family | Simatic S7 |
| Product Type | Digital Input Module |
| Input Current | 200 mA (from backplane bus 5 V DC, max.) |
| Operating Voltage | 120 V ac/dc |
| Number of Digital Inputs | 32 |
| Input Voltage Type | AC/DC |
| Rated Value (UC) | 120 V; 47 ... 63 Hz |
| Signal "0" Voltage Range | 0 to 20 V UC |
| Signal "1" Voltage Range | 79 to 132 V AC; 80 to 132 V DC |
| Input Current for Signal "1" | Typical 2 mA; 2 to 5 mA |
| Input Delay | 5 ms to 25 ms for "0" to "1"; 5 ms to 25 µs for "1" to "0" |
| Cable Length | Shielded, max. 1 000 m; Unshielded, max. 600 m |
| Connectable Encoders | 2-wire sensor (permissible quiescent current, max. 1 mA) |
| Diagnostics Indication LED | Status indicator digital input (green) |
| Potential Separation | Between the channels, in groups of 8; Between the channels and backplane bus |
| Isolation | Isolation tested with 1 500 V AC |
| Dimensions | Width 25 mm, Height 290 mm, Depth 210 mm |
| Weight | Approx. 600 g |
The Siemens SIMATIC S7 Series Digital Input Module, part number 6ES7421-1EL00-0AA0, is a high-quality component designed for seamless integration into S7-400 PLC systems. This module is engineered to handle 32 isolated digital inputs, allowing for a broad range of signal processing tasks in industrial automation environments. With an input voltage rated at 120 V ac/dc and a current draw from the backplane bus of 5 V DC, max. 200 mA, it is well-suited for demanding applications.
The module's compact dimensions, 25 mm in width, 290 mm in height, and 210 mm in depth, make it an efficient choice for space-constrained installations. It also features a typical power loss of 6.5 W, ensuring energy-efficient operation. The input delay for standard inputs ranges from a minimum of 5 ms to a maximum of 25 ms, providing reliable and timely signal processing.
For enhanced system reliability, the module includes potential separation between channels and the backplane bus, with isolation tested at 1,500 V AC. This ensures robust performance and protection against electrical interference. The module's green LED indicators provide immediate diagnostics and status information, simplifying maintenance and troubleshooting.
Designed for versatility, the module can accommodate cable lengths up to 1,000 m when shielded and 600 m when unshielded, offering flexibility in system layout. It also supports the connection of 2-wire sensors, with a permissible quiescent current of up to 1 mA.
Overall, the Siemens 6ES7421-1EL00-0AA0 Digital Input Module is a reliable and efficient solution for expanding the capabilities of your industrial control systems, providing precise digital input handling with robust isolation and diagnostic features.
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Frequently Asked Questions
What is the input voltage range for this Digital Input Module?
The input voltage range for the SIMATIC S7 Series Digital Input Module is rated at 120 V AC/DC, with a signal '0' recognised from 0 to 20 V UC and a signal '1' from 79 to 132 V AC or 80 to 132 V DC.
How many digital inputs does this module support?
The module supports 32 digital inputs, which can all be controlled simultaneously.
Can this module be used with 2-wire sensors?
Yes, the module can be connected to 2-wire sensors, with a permissible quiescent current of up to 1 mA.
What are the dimensions of this Digital Input Module?
The dimensions of the module are 25 mm in width, 290 mm in height, and 210 mm in depth.
What is the typical power loss for this module?
The typical power loss for the module is approximately 6.5 W.
Is there potential separation between the digital inputs?
Yes, there is potential separation between the channels and also between the channels and the backplane bus.
What is the maximum cable length that can be used with this module?
The maximum cable length for shielded cables is 1,000 meters and for unshielded cables, it is 600 meters.
How is the module isolated?
The module features isolation tested with 1,500 V AC to ensure safe operation and protection against electrical interference.
What type of diagnostics does the module provide?
The module provides diagnostics through an LED indicator that shows the status of the digital inputs.
What is the input delay for signals on this module?
The input delay for standard inputs is a minimum of 5 ms and a maximum of 25 ms for '0' to '1' transitions, and a minimum of 5 ms and a maximum of 25 µs for '1' to '0' transitions.
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