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- Siemens
- 6AG1326-2BF41-2AY0
- Digital Output Module
- Germany
- 80 × 125 × 120 mm
- 0.486 kg
- Xiamen, China
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Product Overview
The Siemens 6AG1326-2BF41-2AY0 SIPLUS S7-300 Fail-Safe Digital Output Module is used in safety-oriented S7-300 control architectures to transfer digital commands from the control system to field devices. Typical loads include contactors, solenoid valves, shutdown devices, and other actuators that need to respond to safety logic.
In a fail-safe automation system, output signals are more than simple switching commands. The control architecture must be able to place connected equipment into an appropriate state when a hazardous condition or defined fault occurs. This module forms the output-side interface for that process, linking the S7-300 safety controller with the equipment performing the physical safety action.
The SIPLUS version is intended for industrial installations where environmental conditions can be more demanding than those of conventional automation applications. It can therefore be considered when maintaining or expanding existing SIPLUS S7-300 safety systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6AG1326-2BF41-2AY0 |
| Product Family | SIPLUS S7-300 |
| Product Type | Fail-Safe Digital Output Module |
| I/O Type | Digital Output |
| Application | Safety-Related Automation |
| System Platform | S7-300 |
| Dimensions | 80 × 125 × 120 mm |
| Weight | 0.486 kg |
Main Features
- SIPLUS S7-300 system integration
- Fail-safe digital output functionality
- Suitable for safety-related actuator control
- Interfaces PLC safety logic with field equipment
- Supports discrete shutdown and protective functions
- Suitable for machinery and process automation
- Designed for integration into S7-300 control cabinets
- Appropriate for demanding industrial environments
- Can be used in established safety I/O architectures
- Supports maintenance and replacement of existing systems
Working Principle
The module sits between the fail-safe control logic and the field actuators.
Safety Logic → S7-300 Controller → Fail-Safe Output Module → Actuator → Machine or Process
During normal operation, the control system determines the required output state based on field signals and programmed logic. The module then transfers the corresponding digital command to the connected actuator.
If the safety system detects a defined hazardous condition, the configured safety logic can change the output state so that the associated actuator moves the equipment toward its predetermined safe condition.
This makes the module particularly relevant to functions such as equipment shutdown, protective interlocking, and controlled de-energization.
Role in the Safety I/O Architecture
| System Element | Function |
|---|---|
| Fail-Safe CPU | Executes safety-related logic |
| Safety Input Module | Receives signals from safety devices |
| 6AG1326-2BF41-2AY0 | Provides fail-safe digital outputs |
| Safety Relay / Contactor | Performs electrical switching |
| Solenoid Valve | Executes pneumatic or hydraulic action |
| Emergency Stop Device | Initiates safety response |
| Engineering System | Configures hardware and safety logic |
The module is therefore located on the actuation side of the safety system, rather than on the sensor acquisition side.
Industrial Applications
| Industry | Typical Application |
|---|---|
| Factory Automation | Machine shutdown functions |
| Automotive Manufacturing | Production equipment protection |
| Packaging | Safety actuator control |
| Material Handling | Conveyor protection |
| Machine Building | Interlock and shutdown circuits |
| Process Industry | Discrete safety functions |
| Industrial Equipment | Fail-safe actuator switching |
System Integration
When integrating this module into an existing S7-300 installation, attention should be given to the complete safety architecture rather than the output module alone.
Important points include:
- Verify the existing S7-300 hardware configuration.
- Confirm the appropriate fail-safe CPU and I/O arrangement.
- Check the electrical requirements of connected actuators.
- Verify field wiring and terminal assignments.
- Configure the module correctly within the engineering environment.
- Confirm the intended safe state for each connected output.
- Perform functional testing after commissioning or replacement.
For retrofit projects, the existing module configuration and safety program should be reviewed before replacing hardware.
Compatible System Components
| Component | Function |
|---|---|
| SIPLUS S7-300 Fail-Safe CPU | Safety program execution |
| Fail-Safe Digital Input Module | Acquisition of safety signals |
| Standard S7-300 I/O | General control functions |
| Safety Sensors | Detect machine or process conditions |
| Contactors | Disconnect electrical loads |
| Solenoid Valves | Control pneumatic/hydraulic equipment |
| Distributed I/O | Remote field-level interfacing |
Recommended Related Models
| Model | Product Type | Application |
|---|---|---|
| Siemens 6AG1326-2BF41-2AY0 | SIPLUS S7-300 Fail-Safe Digital Output Module | Safety output control |
| Siemens 6AG1326-2BF41-2AB0 | SIPLUS S7-300 Fail-Safe Digital Output Module | Fail-safe actuator control |
| Siemens 6AG1326-2BF10-2AB0 | SIPLUS S7-300 Fail-Safe Digital Output Module | Safety digital output |
| Siemens 6AG1326-2BF10-2AY0 | SIPLUS S7-300 Fail-Safe Digital Output Module | Fail-safe output applications |
| Siemens 6AG1326-1BK02-2AY0 | SIPLUS S7-300 Fail-Safe Digital Input Module | Safety signal acquisition |
Key Advantages
- Provides a dedicated fail-safe output interface
- Connects safety logic with physical actuators
- Suitable for machine protection and shutdown functions
- Integrates into S7-300-based safety architectures
- Supports safety-related digital switching
- Suitable for demanding industrial environments
- Useful for S7-300 system maintenance and replacement
- Supports structured separation between safety sensing and actuation
Technical FAQs
How does the 6AG1326-2BF41-2AY0 fit into an S7-300 safety system?
It operates on the output side of the safety architecture, receiving commands from the control system and passing the required digital states to connected safety-related actuators.
What happens to an output when the safety function is triggered?
The actual response depends on the configured safety logic and connected equipment. The system can command the affected output toward its defined safe state, such as removing an enable signal from a contactor or changing the state of a valve.
Is this module suitable for directly controlling high-power equipment?
The module should not be treated as a universal high-power switching device. The electrical characteristics of the output and the connected load must be evaluated, and an appropriate intermediate switching device may be required.
What should be investigated if a safety output does not switch as expected?
Check the safety program status, input conditions, module diagnostics, output wiring, actuator power supply, and the condition of the connected load. A fault can originate anywhere along the signal path rather than necessarily being caused by the output module itself.