Name: Siemens 6AG2526-1BH00-1AB0 SIPLUS S7-1500 F-DI 16x24VDC HF T1 RAIL Fail-Safe Digital Input Module
Brand: Siemens
SKU: 21401
Availability: InStock
Rating: 5.0 (1 reviews)

Introduction

The Siemens 6AG2526-1BH00-1AB0 is a SIPLUS S7-1500 F-DI 16x24VDC HF T1 RAIL fail-safe digital input module developed for safety-related automation in demanding railway environments. Based on the standard 6ES7526-1BH00-0AB0, it combines 16-channel 24 V DC digital input processing with PROFIsafe communication and SIPLUS extreme RAIL environmental protection.

The module is designed for safety functions where reliable monitoring of field signals is essential. Typical applications include emergency-stop circuits, protective devices, door and access monitoring, interlocking signals, limit switches, and other safety-related 24 V DC inputs.

A major advantage of the module is its combination of functional safety and railway environmental capability. It supports safety functions up to PL e and SIL 3 under the appropriate system conditions, while its conformal coating and railway qualification help it withstand the demanding environmental conditions encountered in rolling stock and railway infrastructure.

The 6AG2526-1BH00-1AB0 also provides extensive diagnostics and four integrated 24 V DC sensor supplies with electronic short-circuit protection. With configurable input delays, potential separation from the backplane bus, automatic F-type coding, and PROFIsafe integration, it provides a robust interface between field safety devices and an S7-1500 fail-safe control system.

Technical Specifications

Specification	Details
Product	SIPLUS S7-1500 F-DI 16x24VDC HF T1 RAIL
Article number	6AG2526-1BH00-1AB0
Base module	6ES7526-1BH00-0AB0
Module type	Fail-safe digital input module
Digital inputs	16
Input voltage	24 V DC
Rated supply voltage	24 V DC
Permissible supply range	19.2 to 28.8 V DC
Input signal 0	-30 to +5 V DC
Input signal 1	+15 to +30 V DC
Typical input current at signal 1	3.7 mA
Input characteristic	IEC 61131 Type 1
Input delay	0.4 to 20 ms, parameterizable
Encoder supplies	4 × 24 V DC
Maximum sensor-supply current	300 mA per output; 100 mA maximum when vertically mounted
Sensor-supply protection	Electronic short-circuit protection
PROFIsafe	Yes
Safety function	Yes
Maximum performance level	PL e according to ISO 13849-1
Maximum safety integrity level	SIL 3 according to IEC 61508
Railway safety integrity	SIL 2 according to EN 50126/50128/50129; higher levels require application-specific validation
Diagnostics	Yes
Diagnostic alarm	Yes
Supply-voltage monitoring	Yes
Short-circuit diagnostics	Yes
Wire-break diagnostics	No
Group-error diagnostics	Yes
Hardware interrupt	No
Potential separation	Between channels and backplane bus
Isolation test	707 V DC type test
I&M data	I&M0 to I&M3
Automatic coding	Yes
Electronic coding	Type F
Backplane bus power consumption	Approx. 0.9 W
Typical power loss	Approx. 4.6 W
Conformal coating	Yes
Railway standards	EN 50121-3-2, EN 50121-4, EN 50124-1, EN 50125, EN 61373, EN 45545-2 and applicable EN 50155 conditions
Operating temperature	-25 °C to +60 °C
Short-duration temperature	+70 °C for 10 minutes
Maximum installation altitude	2,000 m
Mounting position	Horizontal for specified T1 temperature conditions
Dimensions	35 × 147 × 129 mm
Weight	Approx. 280 g

Recommended Companion Models

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Frequently Selected Alternatives

Model	Product Name
6ES7526-1BH00-0AB0	SIMATIC S7-1500 F-DI 16x24VDC PROFIsafe Fail-Safe Digital Input Module
6AG1526-1BH00-2AB0	SIPLUS S7-1500 F-DI 16x24VDC PROFIsafe Fail-Safe Digital Input Module
6AG2526-2BF00-1AB0	SIPLUS S7-1500 F-DQ 8x24VDC 2A T1 RAIL Fail-Safe Digital Output Module
6AG2526-1BH00-2AB0	SIPLUS S7-1500 F-DI 16x24VDC PROFIsafe Fail-Safe Digital Input Module

Where It Excels in Industrial Use

Railway control and signaling systems requiring fail-safe digital input monitoring.
Rolling-stock automation where safety-related 24 V DC signals must be evaluated reliably.
Emergency-stop, protective-device, interlock, and limit-switch monitoring within PROFIsafe architectures.
S7-1500-based safety systems requiring up to 16 fail-safe digital inputs.
Mobile and stationary railway equipment exposed to vibration, humidity, dust, and chemically active environments.
Applications requiring functional safety up to PL e or SIL 3 under the appropriate system architecture and safety configuration.

Key Strengths at a Glance

16 fail-safe digital inputs for 24 V DC signals.
PROFIsafe communication for safety-related signal transmission.
Supports safety functions up to PL e according to ISO 13849-1 and SIL 3 according to IEC 61508.
Four integrated 24 V DC sensor supplies with electronic short-circuit protection.
Parameterizable input delay from 0.4 ms to 20 ms for standard inputs.
Supply-voltage, short-circuit, group-error, and module/channel diagnostics.
Potential separation between input channels and the backplane bus.
Automatic F-type electronic coding helps prevent incorrect module configuration.
Conformal coating for demanding SIPLUS extreme RAIL environments.
Railway-qualified environmental performance with operation from -25 °C to +60 °C and +70 °C for 10 minutes under T1 conditions.

Technical FAQs

1. What is the function of the 6AG2526-1BH00-1AB0?

The 6AG2526-1BH00-1AB0 is a fail-safe digital input module for the Siemens S7-1500 family. It evaluates 16 digital 24 V DC input signals and communicates safety-related information through PROFIsafe.

2. How many fail-safe inputs does the module provide?

The module provides 16 digital inputs. The inputs are designed for 24 V DC signals and support source/sink input evaluation within the specified electrical limits.

3. What input voltage is recognized as a logical 1?

For the 24 V DC inputs, a signal from +15 V to +30 V is recognized as signal 1, while -30 V to +5 V corresponds to signal 0. The module follows the IEC 61131 Type 1 input characteristic.

4. Does the module support PROFIsafe?

Yes. PROFIsafe is used to transmit safety-related input information within the S7-1500 safety architecture. The module is intended for integration with a suitable fail-safe CPU and configured safety program.

5. What functional safety level can the module achieve?

The module is suitable for safety functions up to Performance Level e according to ISO 13849-1 and SIL 3 according to IEC 61508. For railway applications, the applicable safety integrity level depends on the complete safety system and application approval.

6. Can the input delay be configured?

Yes. The standard digital inputs have a parameterizable input delay. The specified range is 0.4 ms to 20 ms for both the 0-to-1 and 1-to-0 signal transitions.

7. Does the module provide sensor power for connected devices?

Yes. It has four integrated 24 V DC sensor supplies. Each sensor supply includes electronic short-circuit protection, with a maximum output current of 300 mA under horizontal installation conditions.

8. What diagnostic functions are available?

The module provides diagnostics for supply-voltage monitoring, short circuits, group errors, and module/channel status. Diagnostic alarms are supported, while conventional hardware interrupts are not provided.

9. How does the module prevent incorrect safety-module identification?

The module uses automatic coding with an electronic coding element of Type F. This helps ensure that the configured fail-safe module type is correctly identified within the S7-1500 hardware configuration.

10. What environmental conditions are supported for railway operation?

The SIPLUS RAIL version is designed for railway environments and includes conformal coating. For horizontal installation, the specified operating temperature is -25 °C to +60 °C, with +70 °C permitted for 10 minutes under T1 conditions.

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