Product Overview

The Siemens 6AG1972-0BA12-2XA0 SIPLUS DP PROFIBUS Bus Connector is a communication accessory designed to connect PROFIBUS DP network devices to an industrial PROFIBUS bus cable. It provides a physical connection between automation equipment and the fieldbus network, supporting reliable data exchange in distributed control and industrial communication systems.

This connector is based on the standard Siemens 6ES7972-0BA12-0XA0 design and belongs to the SIPLUS product range. Its configuration includes conformal coating intended to provide additional protection for electronic and electrical components in demanding industrial environments. The specified operating temperature range is -25°C to +70°C.

The 6AG1972-0BA12-2XA0 features a 90-degree cable outlet, screw-type connections for the PROFIBUS cable, and a 9-pin Sub-D connector for connecting to network equipment. It does not include a PG programming socket. An integrated terminating resistor can be selected using a slide switch, allowing the connector to be configured according to its position in the PROFIBUS network.

Supporting PROFIBUS DP transmission rates from 9.6 kbit/s to 12 Mbit/s, this connector can be used in compatible Siemens SIMATIC automation installations and other PROFIBUS-based control systems. Its compact construction makes it suitable for applications where communication connections must fit into limited installation spaces.

Unlike a standalone communication processor or network interface module, the 6AG1972-0BA12-2XA0 is a physical network connector. Its primary function is to establish the electrical connection between the PROFIBUS cable and the connected automation device.

Technical Specifications

Function and Working Principle

The 6AG1972-0BA12-2XA0 provides the physical interface between a PROFIBUS DP cable and an automation device. It supports the electrical connection and termination requirements of an RS-485-based PROFIBUS network.

1. PROFIBUS Cable Connection

The connector provides two screw-type electrical connections for the PROFIBUS cable. These connections allow the incoming and outgoing bus conductors to be connected at a network node.

Correct conductor identification, polarity, shielding, and cable preparation are important for maintaining communication reliability. Incorrect wiring may result in communication interruptions or devices failing to join the network.

2. RS-485 Communication Interface

PROFIBUS DP uses RS-485 physical-layer communication for data transmission between network devices. The 6AG1972-0BA12-2XA0 connects the bus cable to the equipment through its 9-pin Sub-D interface.

The connector supports transmission rates from 9.6 kbit/s to 12 Mbit/s. The actual network speed must be configured consistently across the PROFIBUS installation and should comply with the cable length and network design requirements.

3. Integrated Bus Termination

A PROFIBUS network requires appropriate termination at its physical ends to maintain signal quality. The connector contains an integrated terminating resistor combination that can be selected using a slide switch.

When the connector is installed at a network endpoint, the termination may need to be enabled. For an intermediate device, the termination is normally disabled so that the bus signal can continue to the next network segment.

Incorrect termination settings can cause communication errors, unstable data exchange, or intermittent network failures. The termination configuration should therefore be checked whenever a connector is installed, removed, or repositioned.

4. 90-Degree Cable Outlet

The 90-degree cable outlet allows the PROFIBUS cable to leave the connector at a right angle. This design can help manage cable routing where equipment is installed close to cabinet walls, neighboring modules, or other electrical components.

The angled outlet can also reduce unnecessary cable bending when the connector is mounted in a compact control cabinet.

5. Conformal Coating Protection

The SIPLUS configuration includes conformal coating based on the standard connector design. This protective treatment is intended to improve resistance to environmental influences that may affect electrical and electronic components.

It does not mean that the connector is waterproof or suitable for unrestricted exposure to chemicals, liquids, or conductive contaminants. Installation conditions must remain within the product’s specified environmental limits.

Role in Industrial Automation Systems

The Siemens 6AG1972-0BA12-2XA0 plays a supporting role in PROFIBUS communication infrastructure. It does not process automation logic or control machine operations directly. Instead, it provides the physical network connection required for communication between compatible devices.

PLC Network Connection

In a PROFIBUS-based PLC system, the connector can be used to connect a PLC communication interface to the bus cable. This allows the controller to exchange data with distributed I/O stations, drives, remote devices, and other network participants.

The connector’s 9-pin Sub-D interface provides the equipment-side connection, while its screw terminals accommodate the PROFIBUS cable.

Distributed I/O Communication

Distributed I/O stations allow sensors and actuators to be connected at locations closer to the production equipment. PROFIBUS DP provides the communication link between these stations and the central controller.

The 6AG1972-0BA12-2XA0 can support the physical bus connection at compatible network nodes, helping maintain the communication path between the controller and distributed devices.

Drive and Motor-Control Networks

PROFIBUS DP is commonly used to exchange control commands and operating information with compatible motor drives. A properly installed bus connector helps establish the physical communication connection between the drive interface and the PROFIBUS network.

The connector itself does not control motor speed or generate drive commands. Those functions are handled by the drive and the automation controller.

Industrial Communication Infrastructure

The connector can also be used in established PROFIBUS installations that include multiple controllers, remote I/O stations, operator interfaces, and process equipment.

Its role is especially important during network installation, maintenance, and replacement, where a correctly configured physical connection is necessary for stable data transmission.

Industrial Applications

1. Siemens SIMATIC Automation Systems

The connector can be used in compatible SIMATIC automation installations that rely on PROFIBUS DP communication. It provides the physical connection between the PROFIBUS cable and the equipment’s communication interface.

Typical system components may include PLC controllers, communication processors, remote I/O stations, and compatible field devices.

2. Distributed Control Cabinets

Industrial facilities often use multiple control cabinets connected through a PROFIBUS network. The 90-degree cable outlet can be useful where space is limited and cable routing needs to remain organized.

The compact connector design helps simplify physical network connections in installations containing multiple communication devices.

3. Manufacturing Production Lines

Automated production lines may use PROFIBUS to coordinate controllers, drives, remote I/O stations, and machine subsystems.

The 6AG1972-0BA12-2XA0 can provide a suitable cable connection for compatible PROFIBUS nodes, helping maintain communication between different sections of a production line.

4. Process Automation

Process-control installations often require communication between controllers, remote signal stations, and field equipment. PROFIBUS DP can be used as part of this communication architecture.

The connector provides the physical interface needed to attach compatible devices to the bus network.

5. Motor Drive Installations

Industrial motor drives may exchange operating commands, speed references, status information, and diagnostic data through PROFIBUS DP.

When a compatible drive is equipped with a PROFIBUS interface, this connector can be used to establish its bus connection.

6. Maintenance and Replacement Projects

In existing PROFIBUS installations, connector wear, damaged cable entries, loose terminals, or incorrect termination settings can contribute to communication problems.

Replacing a damaged connector with the correct configuration can help restore the physical network connection without changing the entire communication architecture.

Installation and System Integration

Correct installation is essential for maintaining reliable PROFIBUS communication.

1. Verify Connector Compatibility

Before installation, confirm that the equipment uses a compatible 9-pin Sub-D PROFIBUS interface. Also verify the connector’s mechanical arrangement, cable outlet direction, and available installation space.

The 6AG1972-0BA12-2XA0 does not include a PG programming socket. If a programming or diagnostic connection through the connector is required, a different connector configuration may be necessary.

2. Prepare the PROFIBUS Cable

Prepare the cable according to the connector’s installation instructions. Identify the bus conductors and shielding arrangement before connecting the wires to the screw terminals.

Avoid excessive stripping or damaged conductors. Ensure that the cable is secured correctly and that the shielding arrangement follows the network design.

3. Configure the Terminating Resistor

Determine whether the connector is installed at the end of the PROFIBUS segment or at an intermediate node.

• Enable the terminating resistor at the appropriate network endpoint.
• Disable termination at intermediate nodes where the bus continues.
• Check the termination status after any network modification.

The terminating resistor must be configured consistently with the physical network layout.

4. Connect the Sub-D Interface

Align the connector with the equipment’s 9-pin Sub-D communication port and secure it using the appropriate fastening arrangement.

A properly secured connection helps prevent accidental disconnection caused by vibration or maintenance activity.

5. Route the Cable Correctly

Use the 90-degree outlet to organize cable routing while maintaining the recommended bending radius. Avoid placing excessive mechanical stress on the connector or allowing the cable to interfere with adjacent modules.

Keep PROFIBUS cables separated from sources of significant electrical interference where required by the installation guidelines.

6. Verify Network Communication

After installation, inspect the cable connections, shielding, and termination settings. Check the controller and connected devices for communication status and diagnostic messages.

If communication problems occur, inspect the physical cable, connector seating, polarity, termination configuration, and network parameters before replacing other automation components.

Compatible System Components

The 6AG1972-0BA12-2XA0 is a network accessory rather than an independent controller. It is normally installed with compatible PROFIBUS equipment.

The components listed above are examples of equipment that may be used in a PROFIBUS network. Their inclusion does not mean that they are supplied with the connector.

Alternative Models and Replacement Considerations

The Siemens 6AG1972-0BA12-2XA0 belongs to a broader range of PROFIBUS connectors. Several related models have different cable outlets, programming interfaces, and connection methods.

These models should not be treated as automatic substitutes. Before replacement, compare:

• Whether a PG programming socket is required.
• Cable outlet direction and available installation clearance.
• Screw-terminal or FastConnect wiring method.
• Operating temperature requirements.
• Protective coating and environmental requirements.
• PROFIBUS transmission rate.
• Connector dimensions and mechanical fit.
• Terminating resistor functionality.

For installations requiring the SIPLUS environmental configuration, replacing the connector with a standard model may change the environmental protection characteristics.

Key Advantages

High-Speed PROFIBUS DP Support

The connector supports PROFIBUS DP transmission rates up to 12 Mbit/s, making it suitable for compatible industrial communication networks.

Integrated Terminating Resistor

The built-in terminating resistor combination can be selected using a slide switch, simplifying network termination at the appropriate bus endpoint.

90-Degree Cable Outlet

The angled cable outlet supports more convenient cable routing in compact control cabinets and installations with limited clearance.

Conformal Coating

The SIPLUS configuration includes conformal coating intended to provide additional protection against environmental influences.

Compact Mechanical Design

With dimensions of 15.8 × 64 × 35.6 mm and a weight of approximately 10 g, the connector occupies very little installation space.

Screw-Type Cable Connections

The screw-terminal arrangement provides a practical method for connecting the PROFIBUS cable conductors.

Established PROFIBUS Compatibility

The connector is designed for connecting compatible PROFIBUS nodes to a PROFIBUS bus cable, supporting maintenance and expansion of existing automation networks.

Technical FAQs

1. What is the Siemens 6AG1972-0BA12-2XA0?

It is a SIPLUS DP PROFIBUS bus connector designed to connect compatible automation devices to a PROFIBUS DP network.

2. What is the difference between 6AG1972-0BA12-2XA0 and 6ES7972-0BA12-0XA0?

The 6AG1972-0BA12-2XA0 is the SIPLUS version based on the 6ES7972-0BA12-0XA0 design. It includes conformal coating and an extended specified operating temperature range.

3. What communication speed does this connector support?

It supports PROFIBUS DP transmission rates from 9.6 kbit/s to 12 Mbit/s.

4. Does the connector have an integrated terminating resistor?

Yes. It contains an integrated resistor combination that can be selected using a slide switch.

5. Does the 6AG1972-0BA12-2XA0 include a PG socket?

No. This model is specified without a PG programming socket. A related model with a PG interface may be required if that function is needed.

6. What type of cable outlet does it use?

It has a 90-degree cable outlet, allowing the PROFIBUS cable to be routed at a right angle from the connector.

7. What type of cable connection does it use?

The PROFIBUS cable is connected through screw terminals. The equipment-side interface is a 9-pin Sub-D connector.

8. What is the operating temperature range?

The specified operating temperature range is -25°C to +70°C.

9. Can this connector be used with Siemens PLC systems?

Yes, it can be used with compatible Siemens automation equipment that provides a suitable PROFIBUS interface. The PLC or communication module must support the required PROFIBUS connection.

10. What should be checked when replacing this connector?

Check the complete model number, PG socket requirement, cable outlet direction, wiring method, terminating resistor, environmental requirements, and physical dimensions. Incorrect termination or wiring can cause communication problems even when the replacement connector is mechanically compatible.

Procurement and Maintenance Recommendations

When purchasing the Siemens 6AG1972-0BA12-2XA0, verify the complete part number and ensure that the connector matches the original network configuration. Pay particular attention to the SIPLUS version, 90-degree cable outlet, absence of a PG socket, and integrated terminating resistor.

For replacement projects, compare the existing connector’s cable arrangement and termination settings before installation. A connector with a PG socket or a different cable outlet may look similar but can have different functional or mechanical characteristics.

During maintenance, inspect the screw terminals, cable insulation, shielding, Sub-D connection, and mechanical fastening. Check the terminating resistor switch whenever a network node is added, removed, or relocated.

Keep the connector within its specified environmental limits and avoid exposing the IP20 assembly to direct water or uncontrolled contamination. Correct cable preparation and network termination are essential for stable communication.

Conclusion

The Siemens 6AG1972-0BA12-2XA0 SIPLUS DP PROFIBUS Bus Connector is a compact communication accessory designed for connecting PROFIBUS DP devices to an industrial bus cable. Based on the 6ES7972-0BA12-0XA0 design, it features conformal coating, a 90-degree cable outlet, screw-type cable connections, a 9-pin Sub-D interface, and a selectable integrated terminating resistor.

Supporting communication speeds up to 12 Mbit/s and an operating temperature range of -25°C to +70°C, the connector is suitable for compatible SIPLUS and PROFIBUS-based automation installations. Accurate model identification, correct cable wiring, and appropriate termination settings are essential for reliable network operation.