Product Overview

The Siemens 6AG1972-0BB42-7XA0 SIPLUS DP PROFIBUS Bus Connector is an industrial communication accessory designed to connect PROFIBUS network stations to a PROFIBUS bus cable. It belongs to the Siemens SIPLUS DP product range and is based on the standard SIMATIC DP connector design, with additional conformal coating for demanding industrial environments.

PROFIBUS DP is a fieldbus communication technology widely used in industrial automation. It enables programmable logic controllers, remote I/O stations, drives, and other compatible field devices to exchange process data over a shared communication network. Reliable physical connections are essential because loose wiring, incorrect termination, or poor cable installation can interrupt communication between devices.

The 6AG1972-0BB42-7XA0 provides an RS-485 connection for PROFIBUS DP networks and supports transmission rates from 9.6 kbit/s up to 12 Mbit/s. It features screw-type cable terminals, a 9-pin Sub-D connection, an integrated selectable terminating resistor, and a programming-device socket.

One of its distinctive mechanical features is the 35-degree angled cable outlet. This arrangement can help organize bus wiring in control cabinets and installations where cable direction and available space are important. The connector also includes a PG socket, allowing a programming device to be connected to the network through the appropriate interface.

As a SIPLUS product, this connector is designed for extended environmental conditions. Its conformal coating and specified operating temperature range of -40°C to +70°C make it suitable for applications where standard industrial connectors may not provide the required environmental tolerance.

The 6AG1972-0BB42-7XA0 is a connection accessory rather than an active network controller or communication processor. Its role is to establish a reliable physical connection between the PROFIBUS cable and a compatible automation device.

Technical Specifications

Note: The supplied listing weight is 0.047 kg. Siemens’ technical data sheet specifies a net weight of 67 g. Confirm the actual unit weight before using the figure for shipping or inventory calculations.

Function and Working Principle

The 6AG1972-0BB42-7XA0 provides the physical connection between a PROFIBUS bus cable and an automation device. Its operation is based on the RS-485 electrical interface used by PROFIBUS DP.

1. PROFIBUS Cable Connection

The connector provides two electrical connections for the PROFIBUS cable. The cable conductors are secured through screw terminals, establishing the electrical path required for data transmission.

Correct conductor assignment and secure tightening are important. Incorrect wiring or loose connections can lead to intermittent communication, network faults, or reduced signal quality.

During installation, engineers should follow the cable polarity and terminal markings specified by Siemens.

2. RS-485 Data Transmission

PROFIBUS DP uses RS-485 physical-layer signaling for communication between network participants. Data is transmitted through a differential signal pair, helping the network operate reliably in industrial environments when the cable, grounding, shielding, and termination are correctly installed.

The 6AG1972-0BB42-7XA0 supports PROFIBUS DP transmission rates from 9.6 kbit/s to 12 Mbit/s. The actual network speed must be configured consistently across the connected devices and according to the network’s cable length and installation requirements.

3. Integrated Terminating Resistor

A PROFIBUS network requires appropriate termination at its physical endpoints. Incorrect termination can cause signal reflections and communication errors, particularly at higher transmission rates.

This connector includes an integrated resistor combination that can be activated or deactivated using a slide switch. It also provides a disconnecting function associated with the terminating resistor.

The termination switch must be set according to the connector’s position in the network. Termination is generally enabled at the physical ends of a bus segment and disabled at intermediate nodes. The network topology and manufacturer instructions should always be checked before changing the switch position.

4. PG Programming Connection

The connector includes a 9-pin Sub-D device interface and a programming-device socket. This allows a suitable programming device to access the PROFIBUS network through the connector.

The PG socket is useful during commissioning, maintenance, and troubleshooting because it can provide an additional connection point without requiring the main bus cable to be removed.

The programming device must support the relevant PROFIBUS interface and communication settings.

5. Environmental Protection

The SIPLUS version is based on the standard 6ES7972-0BB42-0XA0 connector and includes conformal coating. The specified operating temperature range is -40°C to +70°C.

This design is intended to improve suitability for demanding industrial environmental conditions. However, conformal coating should not be interpreted as complete protection against every form of moisture, chemical exposure, or mechanical damage.

Role in Industrial Control Systems

The Siemens 6AG1972-0BB42-7XA0 supports the communication infrastructure used by distributed automation systems. It provides a connection point between PROFIBUS cables and compatible network devices.

PLC Network Connectivity

A programmable logic controller can communicate with remote I/O stations, drives, and other PROFIBUS DP devices through a fieldbus network.

The connector establishes the physical connection required for a compatible PLC interface or PROFIBUS communication module to participate in the network. It does not independently process control logic or exchange data without an active PROFIBUS device.

Remote I/O Communication

Remote I/O stations are commonly installed near sensors and actuators to reduce long individual wiring runs back to the main control cabinet.

The connector can be used at suitable PROFIBUS network interfaces to connect these stations to the bus cable. Stable physical connections help maintain communication between the central controller and distributed I/O equipment.

Drive and Motor-Control Networks

PROFIBUS DP is widely used to connect compatible motor drives and other automation devices to PLC-based control systems.

The 6AG1972-0BB42-7XA0 can provide the bus connection at an appropriate device interface. The drive or communication module must support PROFIBUS DP and the required connector arrangement.

Engineering and Maintenance Access

The PG socket provides a convenient connection point for compatible programming equipment. Maintenance engineers can use this access point for network diagnostics, device configuration, and commissioning activities.

The availability of a PG socket can reduce the need to disturb the main communication wiring when an engineering connection is required.

Industrial Applications

The SIPLUS DP PROFIBUS connector can be used in industrial automation systems where reliable fieldbus connections and extended environmental tolerance are required.

1. Manufacturing Automation

Production lines often use PROFIBUS DP to connect PLCs, remote I/O stations, motor drives, and other automation equipment.

The connector provides the physical interface between the bus cable and compatible devices. Its angled cable outlet can help organize wiring in compact control cabinets and machinery installations.

2. Process Control Systems

Process automation facilities may use distributed control equipment to monitor and operate pumps, valves, motors, and instrumentation.

Where PROFIBUS DP is part of the control architecture, the connector supports the physical communication network. Correct termination and cable installation are important for maintaining stable data exchange.

3. Industrial Machinery

Packaging machines, material-handling systems, and production equipment may use PROFIBUS DP to coordinate multiple automation devices.

The 35-degree cable outlet can help accommodate wiring layouts where a straight cable connection would interfere with nearby components or cabinet structures.

4. Remote I/O Installations

Remote I/O modules are often distributed across machines and production areas. PROFIBUS DP allows these stations to communicate with a central controller.

The 6AG1972-0BB42-7XA0 can be installed at a compatible remote I/O interface to connect the station to the fieldbus cable.

5. Harsh Industrial Environments

Some industrial facilities experience wide temperature variations or environmental conditions that require components with enhanced protection.

The SIPLUS connector’s conformal coating and -40°C to +70°C operating temperature specification make it suitable for selected installations where these characteristics are required. Actual suitability should still be evaluated against humidity, contamination, vibration, and enclosure conditions.

Installation and System Integration

Correct installation is essential for reliable PROFIBUS communication. The connector should be installed according to Siemens’ wiring instructions and the network’s physical-layer requirements.

1. Verify Device Compatibility

Before installation, confirm that the target device has a compatible PROFIBUS DP interface and a suitable 9-pin Sub-D connection.

Check the complete connector model because different PROFIBUS connectors may have different cable outlet angles, programming sockets, termination functions, and cable connection methods.

2. Prepare the PROFIBUS Cable

Use a PROFIBUS cable that meets the electrical and physical requirements of the network.

Prepare the cable according to the connector’s instructions. Avoid damaging the conductors or shield during stripping and installation. Keep exposed conductor lengths appropriate and secure the cable shield using the specified arrangement.

3. Connect the Cable Conductors

Connect the PROFIBUS conductors to the designated screw terminals. Observe the polarity and terminal markings.

Tighten the terminals correctly and check that no loose conductor strands can cause short circuits or intermittent connections.

4. Set the Terminating Resistor

Determine whether the connector is installed at the physical beginning, end, or middle of the PROFIBUS bus segment.

Activate the integrated terminating resistor at the appropriate bus endpoint and deactivate it at intermediate connection points. Incorrect termination can lead to communication instability and network errors.

When a terminating resistor is activated, follow the manufacturer’s guidance regarding the connector’s isolating or disconnecting function and the continuity of the remaining bus segment.

5. Secure the Connector

Attach the connector to the device interface and secure the screw locking mechanism. Ensure that the angled cable outlet does not place excessive mechanical stress on the cable.

The cable should be routed without sharp bends or unnecessary tension. Adequate clearance should be maintained around adjacent connectors and cabinet components.

6. Test Network Communication

After installation, verify the network’s communication status using the PLC, engineering software, or an appropriate PROFIBUS diagnostic tool.

Check for communication errors, incorrect termination, wiring polarity problems, and configuration mismatches. Confirm that all connected devices are recognized and that the network operates at the configured transmission rate.

Compatible System Components

The 6AG1972-0BB42-7XA0 is a passive network connector and requires compatible active PROFIBUS equipment to perform its communication role.

These components are examples of equipment that may be used in a PROFIBUS DP installation. They are not included with the bus connector.

Alternative Models and Replacement Considerations

When replacing the 6AG1972-0BB42-7XA0, engineers should compare the connector’s complete mechanical and electrical configuration rather than selecting another PROFIBUS plug based only on appearance.

Before selecting a replacement, check:

• PROFIBUS DP compatibility.
• RS-485 electrical interface.
• Maximum supported transmission rate.
• Cable outlet angle.
• Screw-terminal arrangement.
• 9-pin Sub-D device connection.
• PG socket availability.
• Integrated terminating resistor and switching function.
• Conformal coating and temperature requirements.
• Physical dimensions and mounting clearance.

A connector without a PG socket is not functionally identical when engineering access through the connector is required. Similarly, a standard connector may not provide the same environmental characteristics as the SIPLUS version.

Key Advantages

High-Speed PROFIBUS DP Support

The connector supports transmission rates up to 12 Mbit/s, making it suitable for a range of PROFIBUS DP communication applications.

Integrated Terminating Resistor

The selectable terminating resistor supports correct bus termination at appropriate network endpoints.

Programming-Device Socket

The PG socket provides a convenient connection point for compatible engineering and diagnostic equipment.

Angled Cable Outlet

The 35-degree cable outlet helps accommodate cabinet layouts and installations where cable direction is important.

SIPLUS Environmental Design

The conformal coating and specified -40°C to +70°C operating temperature range support use in selected demanding industrial environments.

Compact Mechanical Design

Its compact dimensions of 15.8 × 54 × 39.5 mm allow installation at compatible PROFIBUS interfaces without requiring substantial panel space.

Established SIMATIC Compatibility

Based on the standard 6ES7972-0BB42-0XA0 connector design, this SIPLUS model is intended for compatible PROFIBUS DP network installations.

Technical FAQs

1. What is the Siemens 6AG1972-0BB42-7XA0?

It is a SIPLUS DP PROFIBUS bus connector used to connect compatible PROFIBUS stations to a PROFIBUS bus cable. It includes a PG socket, an angled cable outlet, and an integrated selectable terminating resistor.

2. What is the maximum transmission speed?

The connector supports PROFIBUS DP transmission rates from 9.6 kbit/s up to 12 Mbit/s. The actual network speed depends on the connected devices, cable installation, and network configuration.

3. Does this connector include a programming port?

Yes. It includes a PG socket that allows compatible programming or engineering equipment to access the PROFIBUS network through the connector.

4. What is the purpose of the integrated terminating resistor?

The resistor helps terminate the electrical bus at the appropriate network endpoint and reduce signal reflections. Its switch position must match the connector’s location in the bus topology.

5. What does the 35-degree cable outlet mean?

It describes the angle at which the cable exits the connector. This angled arrangement can make cable routing easier in certain control cabinets and machinery installations.

6. What is the operating temperature range?

The SIPLUS version has a specified operating temperature range of -40°C to +70°C.

7. What is the difference between 6AG1972-0BB42-7XA0 and 6ES7972-0BB42-0XA0?

The 6AG1972-0BB42-7XA0 is the SIPLUS version based on the standard 6ES7972-0BB42-0XA0 design. It includes conformal coating and an extended specified operating temperature range.

8. Can this connector be used with Siemens S7 PLC systems?

It can be used with compatible Siemens SIMATIC systems that provide a PROFIBUS DP interface and the appropriate connector arrangement. Compatibility should be checked against the PLC or communication module documentation.

9. What happens if the terminating resistor is set incorrectly?

Incorrect termination can cause signal reflections, communication errors, or unstable network operation. The resistor should be activated at the appropriate physical endpoints of the bus segment.

10. Is this connector an active PROFIBUS communication module?

No. It is a passive physical connection accessory. It does not independently process data or provide a PROFIBUS network interface without a compatible active automation device.

Procurement and Maintenance Recommendations

When purchasing the Siemens 6AG1972-0BB42-7XA0, verify the complete part number and confirm that the connector includes the required PG socket, angled cable outlet, terminating resistor, and SIPLUS conformal coating.

For replacement projects, compare the original connector’s cable arrangement and network termination requirements with the proposed replacement. A standard PROFIBUS connector may have a similar appearance but may not provide the same environmental specification.

During installation, inspect the screw terminals, connector housing, Sub-D contacts, locking screws, and cable entry. Damaged terminals or poor cable-shield connections can lead to intermittent communication faults.

Maintenance personnel should also verify the terminating resistor switch position whenever a connector is replaced or the bus topology is modified. Network diagnostics should be performed after installation to confirm stable communication.

The supplied listing weight is 0.047 kg, while the Siemens data sheet specifies a net weight of 0.067 kg. Confirm the actual unit and packaging weight before preparing logistics documentation.

Conclusion

The Siemens 6AG1972-0BB42-7XA0 SIPLUS DP PROFIBUS Bus Connector is a compact communication accessory designed for connecting compatible PROFIBUS DP devices to an RS-485 bus network. Its main features include support for transmission rates up to 12 Mbit/s, screw-type cable terminals, a 9-pin Sub-D connection, a PG socket, an integrated selectable terminating resistor, and a 35-degree angled cable outlet.

Based on the standard 6ES7972-0BB42-0XA0 design, the SIPLUS version adds conformal coating and supports an operating temperature range of -40°C to +70°C. These characteristics make it suitable for selected industrial automation installations requiring reliable PROFIBUS connections under demanding environmental conditions.

For maintenance, replacement, and system integration projects, engineers should verify the complete part number, connector orientation, PG access requirements, and termination settings before installation.