Applications

The Siemens 6AG1155-6AU01-7BN0 is a SIPLUS ET 200SP IM 155-6 PN ST interface module designed for distributed I/O systems based on PROFINET. It provides the communication connection between an ET 200SP station and a PROFINET IO controller.

This interface module is based on the standard Siemens 6ES7155-6AU01-0BN0 and features SIPLUS conformal coating with an extended operating temperature range of -40 to +70 °C. It is designed for industrial installations where environmental conditions may be more demanding than those found in conventional control cabinets.

The module supports up to 32 ET 200SP I/O modules plus 16 ET 200AL modules, providing a flexible platform for distributed automation systems.

Typical applications include:

• Factory automation: Connecting distributed ET 200SP I/O stations to Siemens PLC controllers.
• Machine automation: Installing I/O modules close to sensors, actuators, motors, valves, and machine equipment.
• Production lines: Providing distributed I/O communication for assembly, packaging, inspection, and material-handling systems.
• Process automation: Supporting distributed measurement and control applications using PROFINET.
• Automotive manufacturing: Connecting remote I/O stations throughout automated production equipment.
• Packaging machinery: Suitable for compact machine-control panels with distributed digital and analog I/O.
• Water and wastewater systems: Supporting remote monitoring and control installations.
• Energy and infrastructure systems: Providing PROFINET connectivity for distributed control cabinets.
• Harsh industrial environments: SIPLUS conformal coating provides additional protection for electronic components.
• System modernization: Suitable for maintaining and expanding existing ET 200SP PROFINET installations.

The 6AG1155-6AU01-7BN0 is particularly useful when a standard ET 200SP interface module is not sufficient for the environmental conditions of the installation.

Advantages

SIPLUS Conformal Coating

The 6AG1155-6AU01-7BN0 is a SIPLUS version of the ET 200SP interface module. Its conformal coating provides additional protection for the electronic circuitry against specified environmental influences.

The module supports an operating temperature range of approximately -40 to +70 °C, making it suitable for installations exposed to significant temperature variation.

This makes the module a practical option for industrial cabinets, remote control stations, machinery, and other installations where conventional indoor automation conditions cannot always be guaranteed.

PROFINET IO Communication

The interface module provides a PROFINET IO connection for communication with a compatible automation controller.

It uses one PROFINET interface with two Ethernet ports and an integrated switch, allowing practical line and ring network configurations.

The interface supports 100 Mbit/s full-duplex communication and provides functions such as MRP, PROFIenergy, Shared Device, TCP/IP, SNMP, and LLDP.

Support for Large Distributed I/O Stations

The module supports up to:

• 32 ET 200SP I/O modules
• 16 ET 200AL modules
• Up to 256 submodules per station

This provides considerable flexibility for distributed control architectures.

Instead of routing all field signals back to one central PLC cabinet, engineers can position I/O stations closer to the equipment they control. This can reduce cable lengths and simplify machine wiring.

Single Hot Swapping

The 6AG1155-6AU01-7BN0 supports single hot swapping.

When the system architecture and operating conditions permit it, supported modules can be replaced during operation without requiring a complete shutdown of the ET 200SP station.

This can help reduce maintenance downtime in production environments.

PROFINET MRP Support

The module supports Media Redundancy Protocol (MRP).

MRP can be used in suitable PROFINET ring architectures to provide an alternative communication path when a network segment is interrupted.

This feature is particularly useful in production systems where network availability is important.

PROFIenergy Support

The interface supports PROFIenergy, allowing compatible automation equipment to participate in standardized energy-management functions.

This can be useful for machines and production lines that need to reduce energy consumption during planned idle periods.

Shared Device Function

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

This provides additional flexibility for multi-controller automation architectures.

Compact ET 200SP Design

The interface module measures only 50 × 117 × 74 mm, allowing it to fit into the compact ET 200SP modular system.

Its small footprint is useful for machine cabinets and distributed panels where available installation space is limited.

Technical FAQs

1. What is the Siemens 6AG1155-6AU01-7BN0?

The Siemens 6AG1155-6AU01-7BN0 is a SIPLUS ET 200SP IM 155-6 PN ST interface module.

It provides the communication interface between an ET 200SP distributed I/O station and a PROFINET IO controller. The module is based on the standard 6ES7155-6AU01-0BN0 and adds SIPLUS environmental protection.

2. Which communication protocol does the 6AG1155-6AU01-7BN0 use?

The module uses PROFINET IO.

It provides one PROFINET interface with two Ethernet ports through the BusAdapter architecture. Communication can operate at up to 100 Mbit/s full duplex.

The module also supports Ethernet services including TCP/IP, SNMP, and LLDP.

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

The 6AG1155-6AU01-7BN0 supports up to 32 ET 200SP modules plus up to 16 ET 200AL modules.

The actual configuration should also take into account the power requirements, module types, address space, and the capabilities of the connected PLC.

4. What power supply does the 6AG1155-6AU01-7BN0 require?

The module operates with a nominal 24 V DC supply.

The permissible supply range is approximately 19.2 to 28.8 V DC.

The module includes reverse-polarity and short-circuit protection. The rated current consumption is approximately 450 mA, while the maximum current consumption is approximately 550 mA.

5. What is the operating temperature range of the module?

The SIPLUS version is designed for an operating temperature range of approximately -40 to +70 °C.

This extended temperature range is one of the important differences between the SIPLUS version and conventional ET 200SP interface modules.

When installing the module, the complete cabinet environment, ventilation, condensation protection, and applicable installation conditions should still be considered.

6. Does the 6AG1155-6AU01-7BN0 support MRP?

Yes. The interface supports PROFINET Media Redundancy Protocol (MRP).

MRP can be used to create a redundant PROFINET ring topology. If a suitable network segment fails, communication can use the alternate path.

MRP provides network redundancy and should not be confused with controller-level S2 system redundancy.

7. Does the 6AG1155-6AU01-7BN0 support isochronous operation?

No. The 6AG1155-6AU01-7BN0 does not support isochronous mode.

Applications requiring tightly synchronized PROFINET communication should therefore be evaluated against a suitable High Feature ET 200SP interface module.

8. How can a PROFINET communication fault be diagnosed?

A systematic troubleshooting procedure should include:

1. Check the 24 V DC power supply.
2. Check the BusAdapter installation.
3. Inspect PROFINET cables and connectors.
4. Check the LINK and diagnostic LEDs.
5. Verify the PROFINET device name.
6. Check the IP configuration.
7. Confirm that the configured hardware matches the physical ET 200SP station.
8. Check the PLC diagnostic buffer.
9. Verify the PROFINET network topology.
10. Check MRP parameters if a redundant ring is installed.

For intermittent faults, grounding, shielding, electromagnetic interference, connector condition, and power-supply stability should also be investigated.

9. Can modules be replaced while the system is running?

Yes. The module supports single hot swapping.

This allows supported ET 200SP modules to be replaced during operation under the appropriate system conditions.

Hot-swapping procedures should be performed according to the configured system architecture and applicable safety and maintenance procedures.

10. What engineering software can be used with the 6AG1155-6AU01-7BN0?

The module is designed for configuration within the Siemens STEP 7 / TIA Portal engineering environment.

During configuration, engineers define the ET 200SP station, select the interface module and connected I/O modules, configure the PROFINET network parameters, and download the hardware configuration to the controller.

For an existing project, the installed firmware, engineering-software version, hardware configuration, and device description should be checked before replacing the interface module.