Applications

The Siemens 6AG1155-6AA01-7BN0 is a SIPLUS ET 200SP IM 155-6 PN ST BA interface module designed for distributed I/O applications using PROFINET IO. It is based on the SIMATIC ET 200SP 6ES7155-6AA01-0BN0 and is enhanced with conformal coating for demanding industrial environments.

This interface module provides the communication connection between an ET 200SP station and a PROFINET controller. It supports a modular ET 200SP configuration with up to 32 peripheral modules and 16 ET 200AL modules, making it suitable for applications ranging from compact machine controls to larger distributed automation systems.

Typical applications include:

• Factory automation – Connects distributed ET 200SP I/O stations to Siemens PLC systems over PROFINET.
• Machine automation – Places digital, analog, technology, and other I/O modules close to machinery while keeping the main controller centralized.
• Process control – Suitable for distributed measurement and control applications where reliable PROFINET communication is required.
• Packaging and material handling – Supports high-density distributed I/O for conveyors, packaging equipment, sorting systems, and production lines.
• Automotive manufacturing – Useful for distributed machine stations and production equipment requiring compact control hardware.
• Water and wastewater systems – Can be used for distributed monitoring and control panels exposed to variable environmental conditions.
• Energy and utility equipment – Provides a compact PROFINET interface for remote I/O stations.
• Harsh industrial environments – The SIPLUS conformal coating makes the module particularly suitable for applications where condensation, contamination, corrosive atmospheres, or temperature variations may be encountered.
• Retrofit and modernization projects – Allows existing ET 200SP architectures to be expanded while retaining PROFINET-based distributed I/O.

The module is supplied as part of a PROFINET interface bundle, which includes the interface module, server module, and BA 2xRJ45 BusAdapter. This makes the 6AG1155-6AA01-7BN0 especially convenient for complete ET 200SP station installations.

Advantages

SIPLUS protection for demanding environments

The main advantage of the 6AG1155-6AA01-7BN0 compared with a standard ET 200SP interface module is its SIPLUS environmental design.

The electronics use conformal coating and are specified for an extended operating temperature range of approximately -40 to +70 °C. This provides additional flexibility for installations where standard control-room conditions cannot be guaranteed.

PROFINET communication with integrated switching

The module provides a PROFINET interface with two Ethernet ports through the supplied BusAdapter. The integrated switch enables practical line-oriented network architectures without requiring an external industrial Ethernet switch for every station.

PROFINET communication supports 100 Mbit/s full-duplex Ethernet, with automatic negotiation and autocrossing.

High-density ET 200SP architecture

The interface module supports up to 32 ET 200SP peripheral modules and up to 16 ET 200AL modules. This provides considerable flexibility when building distributed I/O stations.

The compact ET 200SP design also allows large numbers of I/O channels to be installed in relatively limited cabinet space.

Single hot swapping

The 6AG1155-6AA01-7BN0 supports single hot swapping, allowing supported modules to be replaced during operation without necessarily shutting down the entire automation system.

This can reduce downtime during maintenance and is particularly valuable for production systems where continuous operation is important.

PROFINET MRP support

The interface supports Media Redundancy Protocol (MRP), allowing redundant Ethernet ring architectures to be implemented where appropriate.

MRP can improve network availability by providing an alternate communication path if a network segment is interrupted.

PROFIenergy support

The module supports PROFIenergy, providing a standardized mechanism for coordinating energy-saving functions within compatible automation systems.

This can be useful in machines and production lines where equipment needs to transition between operating and energy-saving states.

Shared Device capability

The interface module supports Shared Device, allowing a compatible ET 200SP station to be shared by up to two IO controllers.

This can simplify architectures where multiple controllers need access to the same distributed I/O station.

Compact installation

The module has dimensions of only 50 × 117 × 74 mm, making it suitable for compact control cabinets and distributed machine panels.

Its relatively low weight also simplifies installation and replacement work.

Technical FAQs

1. What is the Siemens 6AG1155-6AA01-7BN0?

The 6AG1155-6AA01-7BN0 is a SIPLUS ET 200SP IM 155-6 PN ST BA interface module for PROFINET-based distributed I/O systems.

It is based on the SIMATIC ET 200SP 6ES7155-6AA01-0BN0 and incorporates SIPLUS conformal coating and an extended temperature specification.

The complete bundle includes the interface module, server module, and BA 2xRJ45 BusAdapter.

2. Which communication protocol does the 6AG1155-6AA01-7BN0 use?

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

Its Ethernet interface supports 100 Mbit/s full-duplex PROFINET communication, as well as Ethernet services such as TCP/IP, SNMP, and LLDP.

PROFIBUS DP and EtherNet/IP are not supported by this interface module.

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

The 6AG1155-6AA01-7BN0 supports up to 32 ET 200SP peripheral modules and up to 16 ET 200AL modules within the supported station architecture.

The actual configuration must still be checked against the power budget, selected I/O modules, system configuration, address space, and controller requirements.

4. What power supply does the 6AG1155-6AA01-7BN0 require?

The interface module operates from a nominal 24 V DC supply.

The permissible supply range is 19.2 to 28.8 V DC. The module also provides reverse-polarity and short-circuit protection.

For reliable operation, the 24 V DC power supply should be correctly sized and separated from sources of excessive electrical noise.

5. Can the 6AG1155-6AA01-7BN0 be used in harsh environments?

Yes. The module is specifically designed as a SIPLUS variant and features conformal coating.

Its specified operating temperature range extends from approximately -40 to +70 °C, making it suitable for applications with considerably wider temperature variations than typical indoor control cabinets.

Environmental protection does not eliminate the need for proper enclosure design, ventilation, grounding, and installation according to the application requirements.

6. What is the function of the BusAdapter included with this module?

The BusAdapter provides the physical Ethernet connection between the ET 200SP interface module and the PROFINET network.

The 6AG1155-6AA01-7BN0 bundle includes a BA 2xRJ45 BusAdapter, providing two RJ45 Ethernet ports.

Other BusAdapter connection technologies may be available for ET 200SP systems when different mechanical or environmental requirements exist.

7. Does the 6AG1155-6AA01-7BN0 support redundant PROFINET communication?

The module supports PROFINET MRP, or Media Redundancy Protocol.

MRP can be used to construct a redundant Ethernet ring in which communication can continue through an alternate path after a network interruption.

However, MRP should not be confused with every type of PROFINET system redundancy. The supported redundancy functions should be matched to the controller and network architecture.

8. What is the hot-swapping capability of this interface module?

The 6AG1155-6AA01-7BN0 supports single hot swapping within the ET 200SP architecture.

This feature can reduce maintenance downtime because supported modules can be exchanged during operation under the conditions defined by the system configuration.

Before performing a live replacement, engineers should verify that the specific module and system configuration support the intended maintenance procedure.

9. How should a PROFINET communication fault be diagnosed?

A practical troubleshooting sequence is:

1. Check the 24 V DC supply.
2. Check the PROFINET cable and connectors.
3. Inspect the LINK and communication LEDs.
4. Verify the PROFINET device name.
5. Check the assigned IP configuration.
6. Confirm that the hardware configuration matches the installed modules.
7. Check the PLC diagnostic buffer.
8. Verify the PROFINET topology.
9. Check for duplicate device names or addressing problems.
10. Inspect network switches and MRP configuration if a redundant topology is used.

For intermittent communication problems, cable shielding, grounding, electromagnetic interference, connector quality, and power-supply stability should also be investigated.

10. Which engineering software is used to configure the 6AG1155-6AA01-7BN0?

The interface module is designed for configuration and integration within the Siemens TIA Portal / STEP 7 engineering environment using the appropriate hardware configuration and device data.

During commissioning, engineers normally configure the ET 200SP station, assign the PROFINET device name and network parameters, define the connected I/O modules, and download the hardware configuration to the controller.