Siemens 6AG1155-5BA00-2AB0 Interface Module

Applications

The Siemens 6AG1155-5BA00-2AB0 is a SIPLUS ET 200MP IM 155-5 DP ST interface module designed to connect an ET 200MP distributed I/O station to a PROFIBUS DP network. It is based on the standard SIMATIC ET 200MP interface module 6ES7155-5BA00-0AB0 and is enhanced with conformal coating and an extended operating temperature range for demanding industrial environments.

The module acts as the communication gateway between the PROFIBUS master and the electronic I/O modules installed in an ET 200MP station. It supports up to 12 I/O modules, making it suitable for compact and medium-sized distributed control stations.

Typical applications include:

• Industrial automation and PLC systems – Connects distributed ET 200MP I/O to Siemens S7-1500 controllers and PROFIBUS-based control systems.
• Process automation – Suitable for chemical processing, water treatment, utilities, and other installations where stable distributed I/O communication is required.
• Factory automation – Provides centralized PLC control with remote digital and analog I/O installed close to machines or production equipment.
• Machine control systems – Useful where field signals need to be collected locally while the main PLC remains in a control cabinet.
• Harsh industrial environments – SIPLUS conformal coating improves resistance to condensation, corrosive substances, contamination, and other environmental stresses.
• Oil and gas support systems – Can be considered for control panels and distributed I/O installations exposed to challenging environmental conditions, subject to the project’s applicable certification and installation requirements.
• Energy and utility systems – Suitable for distributed monitoring and control applications using PROFIBUS DP communication.
• Retrofit projects – A practical choice when an existing PROFIBUS architecture needs additional ET 200MP distributed I/O capacity without replacing the entire control system.

The 6AG1155-5BA00-2AB0 is particularly useful when a standard ET 200MP interface module does not provide sufficient environmental robustness. Its SIPLUS design allows engineers to maintain the familiar ET 200MP architecture while improving suitability for difficult installation conditions.

Advantages

SIPLUS design for demanding environments

The most important advantage of the 6AG1155-5BA00-2AB0 is its SIPLUS construction. The module uses conformal coating to provide enhanced protection against environmental influences that can be problematic for conventional automation hardware.

It is specified for an extended operating temperature range of approximately -40 to +60 °C, with startup capability from -25 °C. This makes it suitable for applications where ordinary control-cabinet equipment may require additional environmental protection.

Reliable PROFIBUS DP communication

The interface module provides a direct PROFIBUS connection to the ET 200MP station. PROFIBUS DP communication supports transmission rates up to 12 Mbit/s, allowing distributed I/O data to be exchanged efficiently with the PLC or PROFIBUS master.

Automatic baud-rate detection simplifies commissioning when the network configuration is correctly established.

Support for up to 12 I/O modules

One interface module can control a distributed ET 200MP station containing up to 12 I/O modules. This provides a useful balance between installation density and system architecture.

Instead of routing every field signal back to a central cabinet, I/O modules can be installed closer to the equipment they serve.

24 V DC system supply

The module operates from a nominal 24 V DC supply with an allowable range of 19.2 to 28.8 V DC. This is consistent with common industrial control power architectures.

Integrated diagnostics

LED indicators and diagnostic functions help maintenance personnel determine whether the interface module, PROFIBUS connection, or connected I/O station is operating normally.

This is particularly valuable when the module is installed in remote or difficult-to-access control cabinets.

PROFIBUS DPV1 support

The module supports PROFIBUS DPV1 functions, making it suitable for automation systems that require more than basic cyclic process data exchange.

Compact ET 200MP architecture

With a width of only 35 mm, the interface module fits into the compact ET 200MP modular architecture. This helps reduce cabinet space while still allowing distributed I/O expansion.

Technical FAQs

1. What is the Siemens 6AG1155-5BA00-2AB0?

The 6AG1155-5BA00-2AB0 is a SIPLUS ET 200MP IM 155-5 DP ST interface module. It connects an ET 200MP distributed I/O station to a PROFIBUS DP network and communicates with the PROFIBUS master in the PLC system.

It is based on the standard 6ES7155-5BA00-0AB0 and adds SIPLUS environmental protection features.

2. Which communication protocol does the 6AG1155-5BA00-2AB0 use?

The module uses PROFIBUS DP with an RS-485 physical interface. The maximum supported transmission rate is up to 12 Mbit/s.

The PROFIBUS address can be configured within the supported address range, allowing the interface module to operate as a distributed station on the PROFIBUS network.

3. How many I/O modules can be connected to one 6AG1155-5BA00-2AB0?

The interface module supports up to 12 I/O modules within an ET 200MP station.

The actual system configuration should also consider the selected module types, electrical load, diagnostic requirements, and the configuration limits of the associated PLC and engineering software.

4. What power supply does the Siemens 6AG1155-5BA00-2AB0 require?

The interface module uses a nominal 24 V DC supply. The permissible supply range is approximately 19.2 to 28.8 V DC.

When commissioning the module, the 24 V DC supply should be checked for voltage stability, correct polarity, suitable protection, and sufficient current capacity.

5. Can the 6AG1155-5BA00-2AB0 be used in harsh industrial environments?

Yes. This is one of the key reasons to select the SIPLUS version.

The module features conformal coating and an extended environmental specification compared with standard ET 200MP hardware. It is designed for applications involving conditions such as condensation, corrosive atmospheric influences, contamination, and extended temperature ranges.

The exact installation environment should still be evaluated against the applicable Siemens environmental and certification requirements.

6. How should PROFIBUS communication faults be diagnosed?

Start by checking the PROFIBUS cable, connector, shielding, termination, station address, and network baud rate. The module's diagnostic indicators should then be checked to determine whether the problem is local to the interface module or originates elsewhere on the PROFIBUS network.

If the physical network is healthy, verify that the configured station address and hardware configuration match the actual installation.

7. Can the module support failsafe I/O?

The ET 200MP architecture can be configured with appropriate fail-safe modules and system components. However, the safety function depends on the complete system architecture, including the PLC, F-I/O, PROFIBUS configuration, and safety engineering.

The interface module itself should not be treated as an independent safety controller.

8. What should be checked during initial commissioning?

A typical commissioning sequence includes:

1. Install the module on the appropriate S7-1500 mounting rail.
2. Connect the 24 V DC supply.
3. Install the required ET 200MP I/O modules.
4. Configure the PROFIBUS station in the engineering environment.
5. Set the correct PROFIBUS address.
6. Verify cable shielding and network termination.
7. Download the hardware configuration.
8. Check RUN, ERROR, MAINT and communication indications.
9. Confirm I/O data exchange with the PLC.
10. Test the field devices under controlled operating conditions.

9. What are common causes of ET 200MP station errors?

Common causes include incorrect PROFIBUS addressing, communication cable problems, missing or incorrect bus termination, incompatible hardware configuration, insufficient 24 V DC supply, incorrect module order, or an I/O module fault.

For intermittent failures, engineers should also investigate electromagnetic interference, grounding, shielding, connector quality, and environmental conditions.

10. Can the 6AG1155-5BA00-2AB0 replace a standard 6ES7155-5BA00-0AB0?

The 6AG1155-5BA00-2AB0 is based on the 6ES7155-5BA00-0AB0 and provides the same fundamental ET 200MP IM 155-5 DP ST functionality while adding SIPLUS environmental characteristics.

However, a replacement should always be checked against the actual project configuration, environmental requirements, firmware/software compatibility, certifications, and applicable system documentation before installation.