6AG1226-6BA32-5XB0 — Product Description, Technical Specifications, Applications, Advantages, and Related Models

1. Product Overview

The 6AG1226-6BA32-5XB0 is a SIPLUS S7-1200 SM 1226 F-DI fail-safe digital input module designed for safety-related industrial automation applications. It provides 16 digital inputs operating with 24 V DC signals and supports safety communication through PROFIsafe.

This module is intended for control systems that must monitor safety-related field devices and transfer their status to a compatible fail-safe controller. Typical devices may include emergency-stop circuits, safety switches, guard-door monitoring devices, and other compatible safety sensors.

The module is based on the standard 6ES7226-6BA32-0XB0 hardware platform and incorporates a conformal coating. Its specified operating temperature range is -25°C to +55°C.

A major feature of this module is its support for safety applications requiring up to Performance Level e under ISO 13849-1 or Safety Integrity Level 3 under IEC 61508, subject to the complete system architecture and applicable safety requirements.

The module is intended to form part of a properly engineered safety-control system. Its presence alone does not make an entire machine safety-compliant; the controller, field devices, safety program, wiring, configuration, and validation must all be appropriate for the intended safety function.

2. Product Identification

3. Detailed Technical Parameters

3.1 Electrical Specifications

The module uses 24 V DC digital signals to receive information from compatible field devices. The controller uses these signals as part of its safety logic and machine-control process.

The difference between the voltage ranges for signal state 0 and signal state 1 provides a defined operating region for interpreting digital input states. Field wiring and connected devices must be selected to meet the specified electrical requirements.

3.2 Input Configuration

The terms 1oo1 and 1oo2 describe different safety architectures.

In a 1oo1 arrangement, one input channel is used for a signal. In a 1oo2 arrangement, two channels can be configured as a pair for a safety-related signal, subject to the permitted module configuration and system design.

The selection must be based on the safety requirements of the machine, the type of field device, and the applicable engineering rules.

3.3 Mechanical Specifications

The module’s dimensions should be considered when planning the control cabinet, wiring ducts, cable routing, and access for maintenance.

Although the module is compact, sufficient clearance should be maintained for wiring, heat dissipation, servicing, and compliance with the complete system’s installation requirements.

The stated weight is an approximate product weight. Packaging, accessories, and shipping materials may increase the total shipping weight.

3.4 Environmental Specifications

The conformal coating is intended to improve the environmental robustness of the electronic assembly. It does not mean that the module is waterproof or that it can be installed without a suitable enclosure.

The specified operating temperature range should be considered when designing a machine or control panel. If the equipment will operate in a colder, hotter, more humid, or otherwise more demanding environment, the installation conditions must be assessed against the module’s exact ratings.

4. Product Introduction

The 6AG1226-6BA32-5XB0 is a fail-safe digital input module for safety-related automation systems based on the S7-1200 platform.

Its primary purpose is to collect digital signals from field devices and make those signals available to a compatible fail-safe controller through the supported safety architecture.

In industrial machinery, safety devices are used to detect conditions that require a machine to stop, remain disabled, or enter a defined safe state. Examples include an opened protective guard, an activated emergency-stop device, or a safety switch indicating that an access point is no longer secured.

A fail-safe input module provides the appropriate interface for these signals when used as part of a correctly engineered safety system.

4.1 Fail-Safe Digital Signal Acquisition

The module is designed for safety-related digital input acquisition rather than general-purpose output switching.

It receives discrete 24 V DC signals from compatible field devices. The safety controller then processes the information according to the configured safety program.

The resulting control action may involve stopping hazardous motion, preventing a machine from restarting, or allowing operation only after defined safety conditions have been met.

The exact response depends on the machine’s safety design and validated control logic.

4.2 Integration with a Safety Controller

The module supports PROFIsafe communication, which is used to exchange safety-related information within a compatible automation architecture.

The controller, communication configuration, input module, and field devices must all be selected and configured appropriately.

Successful integration also requires correct addressing, parameterization, safety-program development, and system validation.

4.3 SIPLUS Environmental Design

The SIPLUS version includes a conformal coating and has a specified operating temperature range of -25°C to +55°C.

These characteristics make it a candidate for industrial installations where environmental conditions must be considered as part of equipment selection.

The module should still be installed in accordance with its specified environmental and mechanical requirements.

4.4 Compact Installation

With a nominal width of 70 mm, a height of 100 mm, and a depth of 75 mm, the module can be incorporated into a compatible control cabinet.

Its compact form helps engineers organize safety-related signal acquisition alongside other compatible automation components.

Cabinet space planning should account for the complete assembly, including wiring, terminal access, heat dissipation, and maintenance clearance.

5. Main Applications

5.1 Emergency-Stop Monitoring

Emergency-stop devices are used to initiate a safety response when an operator identifies a hazardous condition.

A compatible emergency-stop circuit may provide signals to the fail-safe input module, allowing the safety controller to evaluate the status and initiate the programmed safety response.

The input module must be used with suitable safety devices, appropriate wiring, and a validated safety program.

5.2 Protective Guard Monitoring

Industrial machines often use interlocked doors, covers, and protective guards to prevent access to hazardous moving parts.

A suitable safety switch can provide a status signal when a guard is opened or is no longer in its permitted position.

The module can collect these signals so that the safety controller can determine whether the relevant operating conditions are satisfied.

5.3 Machine Safety Systems

Machinery with hazardous motion may require safety functions that monitor operator access, machine status, and other safety-related conditions.

The module can be part of a safety architecture that monitors these signals and transfers them to a compatible controller.

The required safety performance must be determined by the machine risk assessment and verified for the complete system.

5.4 Automated Production Lines

Production lines frequently include conveyors, robotic stations, transfer mechanisms, and automated work cells.

Safety-related inputs can be used to monitor protective guards, access doors, emergency-stop devices, and other compatible safety components.

The module can help collect these signals within the wider control system, supporting coordinated safety responses across the installation.

5.5 Packaging Machinery

Packaging equipment may contain moving cutters, sealing mechanisms, feeding systems, and other moving assemblies.

Safety-related inputs can monitor access points and protective devices around these mechanisms.

The fail-safe controller can use the received signals to implement the required safety functions, such as preventing hazardous operation when a protective guard is open.

5.6 Material-Handling Equipment

Material-handling systems may include conveyors, lifting equipment, automated transfer devices, and positioning mechanisms.

Safety input signals can be used to monitor protective access points and other safety-related devices.

The module is relevant where the design requires fail-safe digital signal acquisition and the selected field devices are electrically compatible.

5.7 Industrial Equipment Operating in Demanding Environments

Some control cabinets are installed in environments where temperature and environmental stress require particular attention.

The SIPLUS variant may be considered for applications within its specified environmental limits.

The complete installation must still account for enclosure protection, wiring, condensation, contamination, and other site-specific conditions.

6. Product Advantages

6.1 Designed for Safety-Related Input Functions

The module is specifically intended for fail-safe digital input acquisition.

This distinguishes it from ordinary digital input modules that may not support the safety functions required by a machine.

When incorporated into a compatible and validated safety architecture, it can help provide the signal interface required for safety-related control.

6.2 Support for PROFIsafe

PROFIsafe allows safety-related information to be exchanged within a compatible industrial communication architecture.

This can simplify the integration of safety-related signals into a properly designed control system.

The benefits depend on the controller, network configuration, supported hardware, and engineering requirements of the installation.

6.3 Sixteen Digital Input Channels

The module provides 16 digital input channels.

This capacity can help consolidate multiple safety-related field signals into a single module, subject to the permitted channel configuration and the safety design.

A sufficient number of channels can also help reduce the need to distribute similar input functions across multiple modules.

6.4 Support for Different Safety Architectures

The module supports 1oo1 and 1oo2 input arrangements as permitted by its configuration.

This offers flexibility when designing safety-related signal acquisition for different types of field devices.

The appropriate arrangement must be determined by the required safety function and the module’s configuration rules.

6.5 Enhanced Environmental Characteristics

The SIPLUS version features conformal coating and a specified operating temperature range of -25°C to +55°C.

These characteristics can be useful when selecting equipment for installations where temperature and environmental stress are important considerations.

The module must nevertheless be operated within its specified limits.

6.6 Compact Mechanical Design

The module’s nominal dimensions of 70 × 100 × 75 mm allow it to be integrated into compatible control cabinets.

A compact design can help organize the system and simplify the placement of related automation components.

6.7 Clear Separation of Safety Inputs and Output Functions

The module is an input-only device.

Separating input acquisition from output switching makes it easier to identify the role of the module during system design, troubleshooting, and maintenance.

A separate, compatible safety output module may be required if the safety architecture also needs fail-safe output switching.

6.8 Support for Structured Maintenance

The complete article number helps maintenance personnel identify the correct module and distinguish it from similar products.

Maintaining accurate hardware records can reduce replacement errors and improve spare-parts management.

For safety-related equipment, replacement procedures should also include the necessary configuration checks, validation, and documentation updates.

7. Five Related Models

The following models are related to the S7-1200 automation and SIPLUS safety module families. They perform different functions and should not be considered interchangeable without checking their specifications.

The dimensions and weights shown for related models are indicative values for comparison and should be checked against the exact hardware revision before engineering or purchasing decisions.

7.1 Model Selection Recommendations

For fail-safe digital inputs

The standard 6ES7226-6BA32-0XB0 is the closest functional comparison because it is the standard hardware basis of the target SIPLUS module.

The standard and SIPLUS variants should not be assumed to have identical environmental characteristics.

For fail-safe DC outputs

The 6AG1226-6DA32-5XB0 is relevant when the application requires fail-safe digital output switching rather than input acquisition.

Before selecting it, verify output current, load characteristics, wiring, and the safety function to be implemented.

For fail-safe relay outputs

The 6AG1226-6RA32-5XB0 may be considered when the application requires relay-based safety output switching.

Relay outputs and electronic transistor outputs have different electrical characteristics and switching limitations, so the choice must be based on the connected load and required safety behavior.

For standard-environment applications

The standard SM 1226 models may be considered when the environmental requirements are met by the standard product version.

A standard model should not automatically replace a SIPLUS variant in an installation that depends on enhanced environmental characteristics.

8. Five Popular Models from the Same Brand’s Automation Portfolio

The following models cover several common automation functions, including PLC control, digital signal acquisition, digital output switching, and analog measurement.

They are not direct substitutes for the target safety input module. Each has a different role within an automation system.

Dimensions and weights for the CPU models are approximate identification values, not guaranteed engineering measurements. Exact values for all models should be confirmed before cabinet design, shipping calculations, or replacement work.

8.1 CPU Selection

A PLC CPU executes the control program and manages the automation system’s logic, data, and communications.

CPU selection depends on the required processing performance, program capacity, communication interfaces, integrated I/O, and system expansion needs.

A CPU does not replace the need for a suitable fail-safe system when the machine requires safety-related control functions.

8.2 Standard Digital Input Modules

A standard digital input module receives discrete signals from devices such as push buttons, proximity switches, and general-purpose sensors.

Standard digital inputs should not be assumed to provide the safety functions of a fail-safe input module.

If a signal is part of a safety function, the complete safety architecture must use appropriately rated and configured components.

8.3 Standard Digital Output Modules

A standard digital output module sends switching commands to compatible field devices.

Its suitability depends on output type, voltage, current, load characteristics, and switching requirements.

It should not be substituted for a fail-safe output module where the application requires a validated safety output function.

8.4 Analog Input Modules

Analog input modules acquire continuously varying electrical signals from compatible measurement devices.

They may be used to monitor process values such as pressure, temperature, level, or flow, depending on the sensor and signal range.

Analog measurement modules perform a different function from the fail-safe digital input module described in this document.

9. Comparison of the Target Module and Related Product Types

This comparison highlights the distinction between safety-related input acquisition, ordinary digital signal processing, safety output switching, and the execution of the main control program.

Although these components may be used together in the same installation, they perform different functions and must be selected accordingly.

10. Installation Considerations

10.1 Electrical Compatibility

Before installation, confirm the supply voltage, input signal ranges, wiring arrangement, and electrical characteristics of every connected field device.

The module is designed for 24 V DC digital inputs. Devices operating at incompatible voltages or using unsuitable output arrangements must not be connected without an appropriate interface.

10.2 Safety Configuration

The safety configuration must match the intended safety function.

This includes selecting the appropriate input arrangement, configuring the controller, setting communication parameters, and validating the safety program.

A module’s maximum stated safety capability does not automatically determine the achieved safety performance of the complete machine.

10.3 PROFIsafe Communication

The module must be integrated into a compatible safety communication architecture.

The engineering process should account for device configuration, addressing, communication parameters, diagnostics, and the safety-related settings required by the controller.

10.4 Environmental Conditions

The specified operating temperature range is -25°C to +55°C.

The installation must also account for humidity, condensation, enclosure protection, vibration, contamination, and other relevant environmental factors.

The conformal coating is not a substitute for an appropriate enclosure or correct installation practice.

10.5 Mechanical Installation

The nominal dimensions are 70 × 100 × 75 mm.

The cabinet layout should provide sufficient space for the module, wiring, access to terminals, heat dissipation, and maintenance.

The exact mounting and orientation requirements should be followed when assembling the complete automation system.

10.6 Maintenance and Replacement

Before replacing an existing module, compare the complete article number, electrical specifications, hardware compatibility, and environmental requirements.

For safety-related equipment, replacement work may also require configuration verification, functional testing, safety validation, and documentation updates.

11. Recommended Selection Process

The following sequence can help reduce selection errors.

For safety applications, selection should be based on the machine risk assessment and the requirements of the complete safety system, rather than on model similarity alone.

12. Final Product Summary

The 6AG1226-6BA32-5XB0 is a SIPLUS S7-1200 SM 1226 F-DI fail-safe digital input module with 16 digital inputs for 24 V DC signals.

Its principal functions and characteristics include:

• Sixteen fail-safe digital input channels.
• Support for PROFIsafe communication.
• Configurable input arrangements, including 1oo1 and 1oo2 configurations where permitted.
• Maximum stated safety capability of PL e and SIL 3, subject to the complete system design and applicable requirements.
• A rated supply voltage of 24 V DC, with a permissible range of 20.4–28.8 V DC.
• Conformal coating and a specified operating temperature range of -25°C to +55°C.
• Nominal dimensions of 70 × 100 × 75 mm.
• Approximate product weight of 0.250 kg.

The module is relevant to safety-related machinery, automated production lines, packaging equipment, material-handling systems, and other industrial installations that require fail-safe digital signal acquisition.

The related-model tables provide alternatives for evaluating standard input modules, fail-safe output modules, relay-based safety outputs, PLC CPUs, and other digital or analog signal modules.

The most important selection rule is to distinguish between functional similarity and genuine interchangeability. A standard digital input module, a fail-safe input module, a fail-safe output module, and a PLC CPU serve different purposes. The final choice should be based on the required safety function, electrical specifications, controller compatibility, environmental limits, and verified mechanical data.