Advantages

High-feature PROFINET interface

The 6AG1155-6AU01-2CN0 belongs to the High Feature class of ET 200SP interface modules. It supports advanced PROFINET functions while maintaining the compact modular architecture of ET 200SP.

The module can handle up to 64 I/O modules and 16 ET 200AL modules, allowing engineers to build substantial distributed stations from a single interface module.

SIPLUS conformal coating

The SIPLUS design incorporates conformal coating, improving the suitability of the electronics for demanding environmental conditions.

The specified operating temperature range is approximately -40 to +60 °C, which provides considerably more environmental flexibility than conventional control-cabinet equipment designed for standard indoor conditions.

S2 system redundancy

One of the key features of this model is S2 redundancy.

When implemented with compatible PROFINET controllers and network architecture, S2 redundancy can improve system availability by allowing the ET 200SP station to maintain communication with a redundant controller arrangement.

This makes the module attractive for applications where an unexpected controller or communication failure could result in significant production downtime.

Multi-hot-swapping capability

The interface module supports multi-hot-swapping, allowing supported ET 200SP modules to be replaced during operation under the applicable system conditions.

For continuous-process and high-availability applications, this can significantly simplify maintenance procedures and reduce planned downtime.

Isochronous operation

The module supports isochronous mode with a minimum cycle time of approximately 0.25 ms.

This is particularly valuable for applications where multiple devices need to operate according to a synchronized communication cycle, such as high-performance motion and machine-control applications.

Large distributed I/O capacity

A single station can support up to 64 I/O modules, together with up to 16 ET 200AL modules.

This allows the interface module to serve as the communication foundation for relatively large distributed I/O stations without requiring multiple interface modules for every small group of field devices.

Flexible PROFINET network connection

The module uses a two-port interface and one slot for a BusAdapter. This architecture allows engineers to select an appropriate BusAdapter according to the physical installation and network requirements.

Depending on the application, copper or fiber-optic connection solutions can be considered within the supported ET 200SP BusAdapter family.

Compact mechanical design

Despite its high functionality, the interface module measures only 50 × 117 × 74 mm.

This compact form factor makes it practical for machine control panels and distributed cabinets where installation space is limited.

Technical FAQs

1. What is the Siemens 6AG1155-6AU01-2CN0?

The 6AG1155-6AU01-2CN0 is a SIPLUS ET 200SP IM 155-6 PN HF interface module for PROFINET-based distributed I/O systems.

It is based on the SIMATIC 6ES7155-6AU01-0CN0 and provides High Feature functionality, including S2 redundancy, multi-hot-swapping, isochronous operation, and support for large ET 200SP stations.

2. What communication protocol does the 6AG1155-6AU01-2CN0 use?

The module uses PROFINET IO for communication with the automation controller.

It provides a two-port PROFINET interface through a BusAdapter and supports industrial Ethernet functions required for integration into Siemens distributed automation architectures.

The module is designed for high-performance PROFINET applications rather than PROFIBUS DP communication.

3. How many I/O modules can be connected to the module?

The 6AG1155-6AU01-2CN0 supports up to 64 ET 200SP I/O modules and up to 16 ET 200AL modules.

The actual configuration must also consider the power budget, address space, selected module types, controller capabilities, and the limitations of the complete ET 200SP station.

4. Does the 6AG1155-6AU01-2CN0 support S2 redundancy?

Yes. S2 system redundancy is one of the major features of this High Feature interface module.

When used with compatible redundant PROFINET controllers and an appropriately designed network, S2 redundancy can increase system availability.

The complete redundancy architecture must be configured consistently in the PLC engineering environment.

5. What is the difference between this module and a standard ET 200SP interface module?

The 6AG1155-6AU01-2CN0 is a High Feature SIPLUS interface module. Compared with basic ET 200SP interface variants, it provides advanced functions such as:

• S2 system redundancy
• Multi-hot-swapping
• Isochronous operation
• High-capacity distributed I/O
• High-performance PROFINET communication
• SIPLUS conformal coating
• Extended environmental specifications

The appropriate model should therefore be selected according to the automation system's performance and availability requirements.

6. What power supply does the 6AG1155-6AU01-2CN0 require?

The module requires a nominal 24 V DC supply.

The permissible supply range is 19.2 to 28.8 V DC. It includes reverse-polarity protection and has a maximum current consumption of approximately 700 mA.

During commissioning, the supply voltage should be measured at the module under operating conditions rather than relying only on the nominal output rating of the power supply.

7. What is the purpose of isochronous operation?

Isochronous operation synchronizes communication and application processes to a defined cycle.

The 6AG1155-6AU01-2CN0 supports a minimum cycle time of approximately 0.25 ms, making it suitable for demanding applications where deterministic timing is important.

This can be particularly useful in synchronized motion, high-speed machine sequences, and other applications requiring consistent communication timing.

8. How should a PROFINET communication fault be diagnosed?

A systematic troubleshooting process should begin with the physical network:

1. Verify the 24 V DC supply.
2. Check the BusAdapter installation.
3. Inspect PROFINET cables and connectors.
4. Check LINK and diagnostic LEDs.
5. Verify the PROFINET device name.
6. Check IP configuration.
7. Confirm that the hardware configuration matches the actual station.
8. Check the PLC diagnostic buffer.
9. Verify the configured topology.
10. Inspect redundancy parameters if S2 operation is being used.

For intermittent faults, engineers should additionally check electromagnetic interference, grounding, cable routing, shielding, and connector quality.

9. Can modules be replaced while the ET 200SP station is running?

Yes. The module supports multi-hot-swapping.

This feature allows supported modules to be removed and inserted during operation under the appropriate system conditions. It is particularly useful for production systems where shutting down the entire I/O station would cause unacceptable downtime.

The exact replacement procedure should follow the configured ET 200SP architecture and applicable Siemens operating instructions.

10. How is the 6AG1155-6AU01-2CN0 configured in an automation project?

The interface module can be integrated into the Siemens engineering environment using the applicable hardware configuration and device data.

The engineer normally defines the ET 200SP station, selects the interface module, configures the connected I/O modules, assigns PROFINET network parameters, and downloads the resulting hardware configuration to the controller.

For older projects, the required device description and supported engineering software version should be checked before commissioning.