Siemens 6AG2155-6AA01-4BN0 — SIPLUS ET 200SP PROFINET Interface Module

1. Product Overview

The 6AG2155-6AA01-4BN0 is a SIPLUS ET 200SP IM 155-6 PN ST BA TX RAIL interface module designed to connect a distributed I/O station to a PROFINET industrial Ethernet network. It serves as the communication interface between a central PLC or automation controller and the ET 200SP peripheral modules installed at a remote location.

This product is designed for demanding industrial and railway-related environments. It features a conformal coating and a specified operating temperature range of -40°C to +70°C, with railway temperature-class conditions permitting exposure to +85°C for up to 10 minutes under the applicable conditions.

The model is based on the standard 6ES7155-6AA01-0BN0 interface-module design. The supplied package includes the interface module, a server module, and a BusAdapter with two RJ45 ports. This makes it suitable for installations that require a compact distributed I/O station with a ready-to-use PROFINET connection arrangement.

The module is intended for industrial automation systems in which sensors, actuators, and I/O modules are installed away from the main controller. Rather than routing every field signal directly to a central PLC cabinet, the ET 200SP station gathers the local I/O and exchanges process data with the controller over PROFINET.

2. Basic Product Information

The product is a communication interface rather than a standalone PLC CPU. It requires compatible ET 200SP I/O modules, suitable configuration software, a supported controller, and an appropriately designed PROFINET network.

3. Detailed Technical Parameters

The following table outlines the module’s electrical characteristics, communication capabilities, environmental ratings, and physical specifications.

The interface module provides communication and station management. The actual input and output functions are supplied by the installed peripheral modules, so the number of digital or analog channels depends on the complete ET 200SP configuration.

4. Product Introduction

The 6AG2155-6AA01-4BN0 is designed for distributed automation architectures. In these systems, the main PLC performs the control logic while remote I/O stations collect signals from sensors and send commands to actuators close to the machinery or process.

The module manages the communication between the remote I/O station and the controller over PROFINET. It allows the controller to exchange process data with the installed I/O modules without requiring every individual field signal to be wired back to the central PLC cabinet.

The supplied BusAdapter has two RJ45 ports, which can simplify the connection of the station to a PROFINET network. Depending on the network design, the ports can be used to connect the station to network equipment or form part of a supported line topology. The exact network arrangement should follow the requirements of the selected controller, switches, and installation.

The SIPLUS version is designed for applications where environmental conditions are more demanding than those generally found in a clean, temperature-controlled cabinet. Its conformal coating and extended temperature specification make it relevant to railway equipment, transport infrastructure, and industrial installations exposed to a wider range of environmental conditions.

The product is supplied as a bundle rather than as an interface module alone. The bundle includes the interface module, server module, and two-port BusAdapter, which simplifies the selection of the main station components.

This is particularly useful when a new distributed I/O station is being designed or when an existing station needs to be maintained using the matching product configuration.

5. Product Applications

5.1 Railway automation systems

Railway environments place specific demands on electronic equipment. Devices may need to withstand wider temperature variations, mechanical vibration, shock, and environmental contamination.

The SIPLUS RAIL interface module is designed for applicable railway installation conditions. It can be used as the communication interface for distributed I/O in suitable railway automation systems, provided the complete system meets the relevant railway requirements.

Potential applications include auxiliary control cabinets, equipment-monitoring systems, train-related subsystems, and railway infrastructure installations. The precise suitability of the module depends on the system’s safety requirements, qualification documentation, installation position, and environmental conditions.

5.2 Distributed machine control

Large machines often have sensors and actuators spread across several physical areas. Bringing every field cable to a single cabinet can increase wiring complexity and make installation more difficult.

A distributed ET 200SP station can be installed near a group of field devices. The interface module exchanges their I/O data with the central PLC through PROFINET, while local wiring terminates at the appropriate peripheral modules.

This arrangement can be useful in assembly machinery, production lines, packaging systems, material-handling equipment, and automated processing machines.

5.3 Industrial production lines

Production lines frequently combine several stations, each with its own sensors, actuators, motors, and local control requirements.

The 6AG2155-6AA01-4BN0 can connect a distributed I/O station to the controller, allowing signals from multiple peripheral modules to be integrated into the PLC program.

For example, a production line may use one remote station to monitor the sensors and actuators of a conveyor section and another station to manage a downstream packaging machine. The controller exchanges process data with both stations over the configured network.

5.4 Process automation

Process plants often have field devices distributed across tanks, pumps, valves, treatment equipment, and auxiliary systems.

A distributed I/O station can gather local signals and communicate them to the controller over PROFINET. The interface module provides the communication path, while the installed input and output modules determine which electrical signals can be connected.

Potential applications include water treatment, utility systems, chemical processing, and industrial fluid handling. The selected peripheral modules must match the field signal types and any applicable hazardous-area or process-safety requirements.

5.5 Infrastructure and utility equipment

Infrastructure systems may contain equipment spread across buildings, service areas, tunnels, substations, and other remote locations.

Distributed I/O can reduce the need to route all field wiring to a single central location. The interface module connects a suitable ET 200SP station to the control network so that field signals can be monitored and controlled by the central automation system.

The extended temperature specification can be useful in installations with limited climate control, although enclosure design and actual ambient temperatures still need to be evaluated.

5.6 Environmental monitoring and equipment diagnostics

An ET 200SP station can collect signals from equipment-status contacts, temperature sensors, pressure transmitters, and other compatible field devices through the relevant I/O modules.

The interface module transfers the station’s process data to the controller, where the PLC program can generate alarms, record operating conditions, or initiate maintenance procedures.

The interface module does not independently measure these process variables. Measurement capability depends on the peripheral modules and field instruments installed in the station.

6. Product Advantages

6.1 Reliable distributed I/O communication

The module provides the communication interface between the ET 200SP station and a PROFINET controller.

This architecture can reduce extensive point-to-point field wiring and make it easier to organize I/O around physical machine sections or process areas.

It also provides a consistent way to exchange process data between the remote station and the controller, provided that the network and station configuration are correctly designed.

6.2 Extended operating temperature range

The specified operating range of -40°C to +70°C is a major feature of this SIPLUS version. It supports installations that experience lower temperatures or greater temperature variation than standard indoor automation environments.

The applicable railway specification also includes a short-duration +85°C condition for 10 minutes. This should not be interpreted as permission to operate continuously at +85°C.

Mounting orientation matters: the specified maximum temperature for vertical installation is lower than that for horizontal installation.

6.3 Conformal coating

The conformal coating provides additional protection for the electronic assemblies against specified environmental influences.

This can be valuable in railway and industrial environments where airborne contaminants, humidity, or other environmental stresses may affect electronic equipment.

The coating does not make the module waterproof, and it does not remove the need for a suitable enclosure, correct wiring, or proper installation.

6.4 Integrated two-port network connection

The supplied BA 2×RJ45 BusAdapter provides two Ethernet ports for the PROFINET connection.

This can simplify station integration and provide flexibility when planning supported network layouts. Network topology, redundancy, and fault-tolerance capabilities depend on the controller, switches, firmware, and overall network design rather than on the presence of two ports alone.

6.5 Support for a modular I/O station

The ET 200SP architecture allows different compatible peripheral modules to be assembled into one distributed station.

A single station can be configured with digital inputs, digital outputs, analog inputs, analog outputs, and other supported modules as required by the application.

This modular approach helps engineers choose the required I/O functions without having to install the same fixed I/O configuration in every machine section.

6.6 Maintenance and identification features

The module supports identification and maintenance data, including I&M0 through I&M3. These functions can help maintenance personnel identify hardware and access supported device information during servicing.

Firmware updates are supported, subject to the relevant hardware and software compatibility requirements.

The model also supports single-module hot swapping in a supported configuration. This feature must be distinguished from unrestricted replacement of any module at any time: the station configuration and operating conditions must permit the replacement procedure.

6.7 Compact installation

The module has specified dimensions of 50 × 117 × 74 mm and an approximate net weight of 0.190 kg for the described bundle.

Its compact size can be helpful when designing distributed I/O cabinets where space is limited. However, the panel layout must also account for the mounting rail, adjacent modules, cable bend radius, connector access, heat dissipation, and maintenance clearance.

6.8 Suitable for complex industrial systems

The module supports stations with up to 32 ET 200SP modules and, in supported configurations, up to 16 ET 200AL modules.

This provides flexibility for applications with multiple I/O types and a substantial number of field signals. The final station capacity depends on the supported hardware combination, configuration rules, controller capabilities, and applicable system limits.

7. Installation and Configuration Considerations

Check controller compatibility. Confirm that the PLC, firmware, engineering software, and configured ET 200SP modules support the selected interface module.

Verify the supply voltage. The rated supply is 24 V DC, with a specified permissible range of 19.2–28.8 V DC. The power supply must also be able to handle the station’s total load and any relevant inrush current.

Plan the PROFINET network. Check the required IP configuration, device name, topology, network load, cable type, and switch capabilities. A network with two ports is not automatically a redundant network.

Confirm the station layout. Ensure that the selected peripheral modules, server module, BusAdapter, and other station components match the required configuration.

Observe the temperature limits. Check the mounting orientation and expected operating temperatures. The allowable maximum differs between horizontal and vertical installation.

Use an appropriate enclosure. The IP20 rating does not protect the module against water ingress or direct exposure to dust and contaminants. The cabinet must provide protection suitable for the installation.

Check railway qualification requirements. Where the product is used on railway vehicles or railway infrastructure, verify the applicable EN 50155, EN 61373, and EN 45545-2 documentation and the specific requirements of the complete system.

Plan maintenance carefully. Although single-module hot swapping is supported under suitable conditions, follow the approved replacement procedure and ensure the station is configured for that operation.

8. Five Related Models

The following models belong to the same SIPLUS ET 200SP family or are closely related interface-module variants. Their features are not identical, so the exact model should be chosen according to the required environmental range, station functionality, and replacement conditions.

The dimensions and weights of the related products are approximate reference values and may vary according to the supplied package and exact hardware revision. Verify the complete order number before selecting a substitute.

Choosing a related model

– 6AG2155-6AA01-4BN0: Suitable when the existing system requires the specific IM 155-6 PN ST configuration with a two-port RJ45 BusAdapter and single-module hot swapping.

– 6AG2155-6AA02-4BN0: Worth evaluating when the application requires a newer station configuration or multi-module hot-swapping capability.

– 6AG2155-6AU01-4BN0: Relevant when selecting the corresponding SIPLUS interface module without the same bundled two-port BusAdapter arrangement.

– 6AG2155-6AU02-4BN0: A related interface-module variant for configurations requiring the corresponding ST hardware and supported multi-module hot swapping.

– 6AG2155-6MU01-1CN0: Worth considering when the communication architecture requires a multi-fieldbus interface rather than a basic PROFINET interface alone.

For a replacement project, compare the complete order number, firmware compatibility, BusAdapter, server module, station configuration, and hot-swapping requirements. Similar product names do not guarantee that modules are directly interchangeable.

9. Five Popular Models from the Same Brand

The following products represent commonly used types of PLC and distributed automation hardware. They complement the ET 200SP interface module by providing controller, digital I/O, or analog I/O functions.

The table intentionally marks some dimensions and weights for verification rather than presenting uncertain figures as confirmed specifications. For procurement, panel design, or shipping calculations, use the data for the exact hardware revision and supplied configuration.

How these products work together

A typical distributed automation system uses a PLC CPU to execute the control program, a PROFINET interface module to connect a remote I/O station, digital input modules to read discrete field signals, digital output modules to control compatible loads, and analog input modules to measure continuous process variables.

For example, in a railway auxiliary equipment cabinet, the PLC can process status signals from the distributed I/O station and issue control commands to connected equipment. In a manufacturing plant, the same general architecture can monitor sensors and operate actuators across multiple machine sections.

The 6AG2155-6AA01-4BN0 provides the communication link for its ET 200SP station. The actual field I/O capabilities depend on the installed modules, and the controller’s program determines how those signals are used.

10. Summary

The 6AG2155-6AA01-4BN0 is a SIPLUS ET 200SP IM 155-6 PN ST BA TX RAIL interface module designed for distributed I/O communication over PROFINET. It is based on the standard 6ES7155-6AA01-0BN0 design and includes an interface module, server module, and two-port RJ45 BusAdapter.

Its main characteristics include a 24 V DC supply, a specified operating temperature range of -40°C to +70°C, conformal coating, support for up to 32 ET 200SP modules and up to 16 ET 200AL modules in supported configurations, and a compact physical size of 50 × 117 × 74 mm. The approximate net weight for the described bundle is 0.190 kg.

The product is particularly relevant to distributed automation systems that require PROFINET communication under demanding environmental conditions, including suitable railway applications. Its modular architecture helps organize field I/O close to the equipment while allowing the central controller to manage the overall process.

Before purchasing or replacing the module, confirm the exact hardware revision, station configuration, BusAdapter arrangement, firmware compatibility, environmental limits, and applicable railway qualification requirements.