
6AG2521-1BH00-4AB0 Digital Input Module Specifications
This listing details the Siemens 6AG2521-1BH00-4AB0 digital input module designed for harsh environments. Engineers can review its technical parameters to assess suitability for specific automation projects.
Quick Facts
- Part number
- 6AG2521-1BH00-4AB0
- Brand
- Siemens
- Category
- I/O Modules
- Product type
- I/O Modules
- Lifecycle
- Active Product
- Dimensions
- 15.3 x 14.9 x 4.3 cm
- Net weight
- 0.28 Kg
- Source category
- SIPLUS extreme RAIL digital input modules
Product Overview
The Siemens 6AG2521-1BH00-4AB0 is a rail-based digital input module derived from the 6ES7521-1BH00-0AB0 base model. It features conformal coating for enhanced protection against environmental factors. Review Siemens 6AG2521-1BH00-4AB0 as I/O Modules with source category SIPLUS extreme RAIL digital input modules, recorded lifecycle Active Product, and submitted model identity.
This unit supports sixteen channels operating at 24VDC, grouped into a single block of sixteen inputs. The design facilitates robust signal acquisition in demanding industrial settings.
Technical Review Notes
- Input delay ranges from 0.05 to 20 milliseconds, allowing precise timing control for digital signals within the automation system.
- The module adheres to IEC 61131 input type 3 standards, ensuring reliable detection of various digital input signal states.
- Hardware interrupt capabilities are integrated, enabling immediate response to critical events without waiting for standard scan cycles.
- Diagnostics functions monitor the module's operational status, providing detailed feedback on input channel conditions and potential faults.
- Operating temperature spans from -40 to +70 degrees Celsius, supporting deployment in extreme thermal environments effectively.
- Overtemperature class OT4 with ST1/2 allows operation up to 85 degrees Celsius for ten-minute intervals during peak loads.
Model Identification
- The part number 6AG2521-1BH00-4AB0 identifies this specific variant within the SIPLUS extreme product family line.
- It is classified under SIPLUS extreme RAIL digital input modules, indicating its specialized construction for rugged applications.
- The base model reference 6ES7521-1BH00-0AB0 serves as the foundation for this coated and extended-range version.
- Lifecycle status is recorded as an Active Product, confirming current manufacturing and support review details for this component.
Technical Parameters
| Product type | I/O Modules |
|---|---|
| Lifecycle | Active Product |
| Dimensions | 15.3 x 14.9 x 4.3 cm |
| Net weight | 0.28 Kg |
| Source category | SIPLUS extreme RAIL digital input modules |
Parameters are factual source fields retained for model review.
Parameter Review
- Physical dimensions are recorded as 15.3 by 14.9 by 4.3 centimeters, fitting standard DIN rail mounting configurations.
- Net weight is listed at 0.28 kilograms, contributing to minimal load impact on the overall rack structure.
- Channel count is fixed at sixteen digital inputs, grouped together for unified processing and diagnostic reporting.
- Voltage specification is set at 24VDC, aligning with common industrial control system power distribution standards.
- Conformal coating application provides additional insulation and corrosion resistance for components exposed to moisture or chemicals.
Catalog Classification
Image & Label Review
- Visual inspection should confirm the presence of the Siemens branding and the full part number label.
- Check for intact connectors and pins, ensuring no physical damage occurred during previous handling or transport.
- Verify the condition of the housing to ensure the conformal coating remains undamaged and fully applied.
- Compare the physical unit against standard SIPLUS extreme RAIL module images for dimensional and feature verification.
Product Image Gallery

Inquiry Preparation
- Gather project documentation specifying required input types and voltage levels to match the 24VDC digital input profile.
- Review environmental conditions to confirm the -40 to +70 degrees Celsius range meets site operational needs.
- Assess rack space constraints to ensure the 15.3 cm width fits within the existing PLC cabinet layout.
- Prepare technical questions regarding integration with S7-1500 controllers and specific diagnostic message interpretations.
Category Context
This module belongs to the broader category of I/O Modules used in programmable logic controller systems.
It falls specifically under SIPLUS extreme RAIL digital modules, designed for enhanced durability and performance.
Digital input modules serve as the primary interface between field sensors and the central processing unit.
Review Notes
- Confirm that the product class indicates review restrictions requiring direct contact with Siemens review contacts for review.
- Verify that all technical parameters align with the specific requirements of the target industrial automation project.
- Ensure that the inquiry includes necessary project details to facilitate accurate technical assessment and support.
- Cross-reference the active lifecycle status to documented long-term support and component review details for future maintenance.



