Product Overview

The Siemens 6AG1972-0BA42-7XA0 SIPLUS DP PROFIBUS Bus Connector is an industrial communication connector designed to connect PROFIBUS DP devices to an RS-485 bus network. It is part of the Siemens SIPLUS product range, which provides automation components with additional environmental protection for demanding industrial operating conditions.

This connector is based on the standard Siemens 6ES7972-0BA42-0XA0 design and incorporates conformal coating. It is intended for connecting PROFIBUS stations to a PROFIBUS bus cable in industrial automation installations where reliable data communication is essential.

The connector supports PROFIBUS DP transmission rates from 9.6 kbit/s to 12 Mbit/s. Its 35-degree inclined cable outlet provides an angled cable-routing arrangement that can be useful when working with compact control cabinets, PLC installations, and distributed automation equipment.

The 6AG1972-0BA42-7XA0 includes an integrated terminating resistor that can be activated or deactivated using a slide switch. This allows the connector to be used at an appropriate position in a PROFIBUS segment where bus termination is required. The design also includes screw connections for PROFIBUS cable conductors and a 9-pin Sub-D connection for the network device.

Unlike versions equipped with a programming-device socket, this model does not include a PG interface. This distinction is important when selecting a replacement connector, particularly in installations where service personnel need direct access to the bus through a programming device.

With its compact dimensions, conformal coating, and extended operating temperature range, the 6AG1972-0BA42-7XA0 is suitable for industrial communication applications involving SIMATIC PLCs, remote I/O stations, and other PROFIBUS DP-compatible equipment.

Technical Specifications

Function and Working Principle

The Siemens 6AG1972-0BA42-7XA0 provides the physical electrical connection between a PROFIBUS DP bus cable and an automation device. It supports the RS-485 signaling method used by PROFIBUS DP and helps maintain the electrical continuity of the communication network.

1. PROFIBUS DP Network Connection

PROFIBUS DP is an industrial fieldbus communication protocol used to exchange data between controllers, remote I/O stations, drives, and other automation devices.

The connector establishes the physical connection between the two-wire PROFIBUS cable and the network interface of a compatible device. Its screw-terminal arrangement allows the bus conductors to be secured inside the connector housing.

A properly installed connector helps maintain the electrical connection required for data transmission between network participants.

2. RS-485 Signal Transmission

The connector is designed for RS-485-based PROFIBUS communication. RS-485 uses differential signaling, allowing data to be transmitted over industrial bus cables with improved resistance to common electrical interference compared with many single-ended signaling arrangements.

The 6AG1972-0BA42-7XA0 supports PROFIBUS DP transmission rates from 9.6 kbit/s to 12 Mbit/s.

The actual communication speed of a network depends on the capabilities of the connected devices, cable characteristics, network length, and configuration.

3. Integrated Bus Termination

A PROFIBUS segment requires correct electrical termination at its physical ends. Incorrect termination can cause signal reflections and communication instability.

This connector incorporates a terminating resistor that can be selected using a slide switch. The switch allows the termination function to be enabled or disabled according to the connector’s position in the network.

When installing or replacing the connector, engineers should check the physical network topology and termination requirements. Termination should be enabled only at the appropriate segment endpoints.

4. Inclined Cable Outlet

The connector features a 35-degree inclined cable outlet. This arrangement allows the bus cable to leave the connector at an angle rather than extending directly outward.

The angled design can help with cable routing in compact cabinets, particularly where PLC modules and communication interfaces are installed close together.

It can also help reduce unnecessary bending or interference with neighboring components when the connector is correctly positioned.

5. Environmental Protection

As a SIPLUS component, the 6AG1972-0BA42-7XA0 is supplied with conformal coating based on its standard connector design.

The coating provides additional protection for the electronic assembly under the environmental conditions specified for the product. Its operating temperature range extends from -40°C to +70°C.

This environmental treatment does not change the connector’s basic communication function. Proper installation, cable protection, and enclosure design remain important.

Role in Industrial Automation Systems

The 6AG1972-0BA42-7XA0 plays a physical connection role in PROFIBUS DP communication networks. It is generally installed at the PROFIBUS interface of a compatible automation device.

PLC Communication

In a PLC-based control system, PROFIBUS DP can connect the central controller with remote I/O stations, drives, and other field devices.

The connector provides the physical interface needed to attach the PROFIBUS cable to the device’s 9-pin Sub-D port.

A stable physical connection is important because communication errors can interrupt the exchange of process data between the controller and connected equipment.

Remote I/O Integration

Remote I/O stations are commonly installed close to sensors and actuators to reduce the amount of field wiring returning to the central control cabinet.

A PROFIBUS connector can connect these stations to the main communication segment. The 6AG1972-0BA42-7XA0 is suitable for this type of connection when the remote I/O device supports the required connector interface.

Drive and Motor Control Networks

Industrial drives may use PROFIBUS DP to exchange speed references, operating commands, status information, and diagnostic data with a PLC.

The connector provides the physical bus connection, while the drive’s communication interface handles protocol processing.

The actual drive communication capabilities depend on the installed communication hardware and device configuration.

Distributed Automation Architecture

In a distributed control system, multiple automation devices communicate through a shared fieldbus. Each physical connection must be installed correctly to maintain network integrity.

The 6AG1972-0BA42-7XA0 can be used at suitable PROFIBUS nodes where its connector configuration and environmental specifications meet the installation requirements.

Industrial Applications

1. SIMATIC PLC Systems

Siemens SIMATIC PLC installations may use PROFIBUS DP to connect controllers with distributed I/O and other automation equipment.

The connector can provide the physical bus connection for compatible PLC communication interfaces. Its angled cable outlet is useful in installations where space around the PLC interface is limited.

2. Distributed I/O Stations

Remote I/O systems allow field signals to be collected and transferred to a central controller over an industrial network.

The 6AG1972-0BA42-7XA0 can connect compatible PROFIBUS DP remote I/O stations to the bus cable, supporting communication between field-level equipment and the PLC.

3. Industrial Drive Systems

Variable frequency drives and other motor-control devices may exchange process data with a PLC through PROFIBUS DP.

The connector can be installed at compatible drive communication interfaces. Correct termination and cable installation are essential for stable communication, especially in networks with multiple connected devices.

4. Process Automation Equipment

Industrial process installations often contain distributed instruments, controllers, and remote interface equipment.

Where PROFIBUS DP is used, the connector can provide the physical connection between network devices and the bus cable. The extended operating temperature range may be useful in installations exposed to wider temperature variations.

5. Manufacturing and Assembly Lines

Automated production lines may use PROFIBUS DP to connect PLCs, remote I/O, drives, and machine-control equipment.

The connector supports the physical communication network that allows these devices to exchange commands and status information.

Its compact housing and inclined cable outlet can help simplify connection arrangements inside machine cabinets.

6. Industrial Control Cabinets

Control cabinets often contain multiple PLC modules, communication interfaces, terminal blocks, and power components.

The angled connector design can help organize PROFIBUS cable routing around adjacent equipment. Its small dimensions also make it suitable for applications where available installation space is limited.

Installation and System Integration

Correct installation is necessary to achieve reliable PROFIBUS communication and prevent unnecessary network faults.

1. Verify the Connector Model

Before installation, confirm that the required connector is Siemens 6AG1972-0BA42-7XA0.

This model has a 35-degree inclined cable outlet, no PG socket, and an integrated switchable terminating resistor. It should not be confused with other PROFIBUS connector versions that have a different outlet angle or an additional programming-device connection.

2. Prepare the PROFIBUS Cable

Use a PROFIBUS cable compatible with the RS-485 connection requirements.

Prepare the cable according to the connector’s installation instructions. Remove the appropriate amount of insulation and shield material without damaging the conductors.

Incorrect cable preparation may cause poor contact, signal interference, or intermittent communication.

3. Connect the Bus Conductors

The connector uses screw terminals for the PROFIBUS cable conductors.

Observe the required conductor polarity and terminal markings. Ensure that the conductors are securely fastened and that there are no loose wire strands that could cause short circuits.

Cable shielding should be handled according to the applicable Siemens installation instructions and the grounding design of the control cabinet.

4. Configure the Terminating Resistor

The connector has an integrated terminating resistor controlled by a slide switch.

Before enabling termination, determine whether the connector is installed at a physical endpoint of the PROFIBUS segment.

Incorrect termination settings can cause communication problems, especially when multiple connectors are incorrectly terminated or a segment endpoint is left without proper termination.

5. Connect the Device Interface

The connector uses a 9-pin Sub-D interface to connect to a compatible PROFIBUS device.

Make sure the connector is properly seated and secured. Avoid excessive mechanical force when attaching or removing the connector.

The connector does not include a PG socket, so applications requiring a direct programming-device connection at this point should consider an alternative connector configuration.

6. Check Cable Routing

Use the inclined cable outlet to organize the bus cable around adjacent components.

Avoid excessive cable bending, mechanical tension, and routing close to sources of strong electrical interference where possible.

Maintain proper separation between communication cables and power cables according to the system installation requirements.

7. Test Network Communication

After installation, check that the connected automation device is recognized by the PROFIBUS network.

Verify the configured transmission rate, device address, bus termination, and cable connections. Monitor the PLC or device diagnostics for communication errors.

If communication is unstable, inspect the cable polarity, shield connection, termination settings, and physical condition of the connector.

Compatible System Components

The 6AG1972-0BA42-7XA0 is designed for use with compatible PROFIBUS DP equipment.

The connector itself does not provide protocol conversion or network signal regeneration. These functions require appropriate automation or communication devices.

Alternative Models and Replacement Considerations

The 6AG1972-0BA42-7XA0 belongs to the SIPLUS range and is based on a standard SIMATIC PROFIBUS connector design.

When selecting an alternative, the connector angle, PG socket availability, termination function, environmental range, and coating requirements should be compared.

These alternatives are not automatically interchangeable. Confirm the exact connector design and cable requirements before selecting a replacement.

Key Advantages

High-Speed PROFIBUS DP Communication

The connector supports PROFIBUS DP transmission rates up to 12 Mbit/s, allowing it to be used in compatible industrial fieldbus networks.

Integrated Termination

The built-in terminating resistor can be switched according to the network topology, simplifying bus termination at appropriate segment endpoints.

Compact Mechanical Design

Its dimensions of 15.8 × 54 × 39.5 mm make it suitable for compact PLC installations and industrial control cabinets.

Inclined Cable Outlet

The 35-degree outlet provides an angled cable-routing arrangement that can help with cable management around closely installed components.

Conformal Coating

The SIPLUS configuration includes conformal coating and supports an operating temperature range of -40°C to +70°C.

Screw-Terminal Cable Connection

The screw connection provides a mechanical method for securing PROFIBUS cable conductors inside the connector.

Compatibility with PROFIBUS DP Equipment

The connector is intended for connecting compatible PROFIBUS stations to the RS-485 bus cable in industrial automation systems.

Technical FAQs

1. What is the Siemens 6AG1972-0BA42-7XA0?

It is a SIPLUS DP PROFIBUS bus connector designed to connect compatible PROFIBUS DP devices to an RS-485 bus cable.

2. What communication protocol does this connector support?

It supports PROFIBUS DP communication using an RS-485 electrical interface.

3. What is the maximum transmission rate?

The connector supports transmission rates from 9.6 kbit/s to 12 Mbit/s. The actual network speed must also be supported by the connected devices and network configuration.

4. Does the connector include a terminating resistor?

Yes. It has an integrated resistor combination that can be enabled or disabled using a slide switch.

5. Does the 6AG1972-0BA42-7XA0 have a PG socket?

No. This model does not include a programming-device socket. If direct PG access is required at the connector location, select a compatible version with a PG interface.

6. What is the cable outlet angle?

The connector has a 35-degree inclined cable outlet, which supports angled cable routing inside industrial control cabinets.

7. What is the operating temperature range?

The specified operating temperature range is -40°C to +70°C.

8. What is the difference between the 6AG1972-0BA42-7XA0 and 6ES7972-0BA42-0XA0?

The 6AG1972-0BA42-7XA0 is a SIPLUS version based on the standard 6ES7972-0BA42-0XA0 design. It includes conformal coating and an extended environmental temperature specification.

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

Yes, provided the PLC or communication module has a compatible PROFIBUS DP interface and the network is configured correctly.

10. What should be checked when replacing this connector?

Check the full part number, cable outlet angle, PG socket availability, terminating resistor, cable connection method, operating temperature range, and physical condition. The replacement must match the requirements of the existing network.

Procurement and Maintenance Recommendations

When purchasing the Siemens 6AG1972-0BA42-7XA0, verify the complete order number rather than selecting a connector based only on its general PROFIBUS appearance.

Pay particular attention to the 35-degree cable outlet, absence of a PG socket, integrated terminating resistor, and SIPLUS conformal coating. These details distinguish this model from other Siemens PROFIBUS connectors.

For replacement projects, compare the original connector with the proposed spare part before installation. Confirm that the cable connection arrangement and termination requirements match the existing network.

During maintenance, inspect the connector housing, cable-entry area, screw terminals, and Sub-D interface. Check for loose conductors, damaged insulation, corrosion, and mechanical stress. Confirm the terminating resistor setting whenever a connector is replaced or the network topology is modified.

If communication faults occur, investigate the entire PROFIBUS segment rather than replacing the connector immediately. Cable shielding, bus polarity, termination, transmission speed, and connected-device configuration can all affect network performance.

For critical automation systems, maintaining spare PROFIBUS connectors and documenting the network termination arrangement can help reduce troubleshooting time and simplify maintenance.

Conclusion

The Siemens 6AG1972-0BA42-7XA0 SIPLUS DP PROFIBUS Bus Connector is a compact RS-485 communication accessory designed for connecting PROFIBUS DP stations to industrial bus networks. It supports transmission rates up to 12 Mbit/s and includes a switchable terminating resistor, screw cable connections, a 35-degree inclined outlet, and conformal coating.

With an operating temperature range of -40°C to +70°C and compact dimensions of 15.8 × 54 × 39.5 mm, it is suitable for compatible industrial automation installations requiring a robust PROFIBUS connection.

For maintenance and replacement applications, confirming the complete model number and connector configuration is essential. Correct cable preparation, termination, grounding, and installation help maintain stable communication between PLCs, remote I/O stations, drives, and other PROFIBUS-compatible equipment.