Product Overview

The Siemens 6AG2193-6BP20-4BB1 is a SIPLUS ET 200SP BaseUnit used to connect a compatible I/O module to field wiring and the station’s internal electrical distribution. Its configuration, identified as BU20-P12+A0+4B TX RAIL, type B1, is intended for applications requiring 12 process terminals, push-in connections, and continuation of an existing load group.

Unlike an electronic input or output module, this BaseUnit does not execute control logic or independently process field signals. It establishes the electrical interface between the installed I/O module and external circuits. In a railway control cabinet, for example, it can support the wiring of sensor signals, actuator circuits, and distributed monitoring equipment while maintaining the station’s defined potential arrangement.

A key distinction of this model is that it has no AUX terminals and is configured to continue an existing load group rather than establish a new one. This makes the choice of BaseUnit important when expanding an ET 200SP station. Selecting a visually similar component with a different potential-group arrangement may alter how the station’s supply distribution is organized.

The SIPLUS version incorporates conformal coating and specified environmental capabilities for demanding industrial and railway-related installations. It also includes temperature acquisition, which distinguishes it from BaseUnit variants without this feature. Before installation, engineers should confirm the electronic module compatibility, potential-group arrangement, operating temperature, and applicable environmental requirements.

Technical Specifications

Product Features

• BU type B1 configuration: Uses a defined BaseUnit arrangement for compatible ET 200SP I/O modules.
• 12 process terminals: Provides the terminal connections required by the installed electronic module.
• Push-in wiring: Allows compatible conductors to be connected without conventional screw-terminal tightening.
• No AUX terminals: Keeps the terminal arrangement specific to applications that do not require an AUX bus connection at this BaseUnit.
• Existing load-group continuation: Maintains the intended potential-group arrangement when installed in the correct station position.
• Integrated temperature acquisition: Adds temperature acquisition capability to the BaseUnit configuration.
• Conformal coating: Protects the coated assemblies under the specified environmental conditions.
• Railway-oriented environmental specifications: Supports applicable temperature, vibration, shock, and electromagnetic compatibility requirements when installed within the defined limits.
• Potential separation: Provides the specified electrical separation between the backplane bus, supply voltage, process terminals, and power bus.

Working Principle

The 6AG2193-6BP20-4BB1 acts as the terminal interface for a compatible ET 200SP electronic module. Field conductors connect to its push-in terminals, while the installed I/O module handles the actual input acquisition or output switching. The BaseUnit itself does not replace the signal-processing functions of the electronic module.

A typical signal path is:

PLC or Controller → ET 200SP Interface Module → Backplane Bus → I/O Module → BaseUnit Terminals → Field Circuit

For a digital input application, a sensor signal reaches the terminal connections and is processed by the installed input module. For a digital output application, the output module switches the assigned circuit and routes the resulting electrical state to the connected field device. The precise signal function depends on the electronic module selected for the station.

The B1 configuration is particularly relevant to the station’s potential-group layout. This model has no AUX terminals and is intended to continue an existing load group. It should therefore be installed in a position that matches the planned electrical distribution rather than being substituted indiscriminately for a BaseUnit that starts a new load group.

Temperature acquisition is another model-specific feature. In applications where temperature monitoring forms part of the equipment arrangement, the corresponding system configuration and connected components must support the intended use of this function. The BaseUnit’s presence alone does not replace any separate process-temperature measurement or control logic required by the application.

The push-in terminal design simplifies wiring, but correct conductor preparation and terminal assignment remain essential. During commissioning, technicians should verify the supply distribution, field connections, module seating, and configured I/O addresses. For railway applications, the specified temperature range and environmental requirements must also be considered in relation to the actual mounting orientation and installation conditions.

Role in the SIMATIC ET 200SP Control Architecture

Within a distributed ET 200SP station, the 6AG2193-6BP20-4BB1 provides the electrical interface between the installed I/O module and external field wiring. It also forms part of the station’s potential-group arrangement, allowing the system to maintain the intended electrical distribution across adjacent BaseUnits.

Controller → ET 200SP Interface Module → Backplane Bus → I/O Module → BaseUnit → Field Devices

The electronic module determines the signal-processing function, while the BaseUnit establishes the required terminal and potential connections. Both must be selected to match the station configuration and application requirements.

Industrial Applications

The actual application depends on the installed I/O module, station configuration, wiring design, and operating environment. Railway-related approval requirements must be assessed against the specific installation rather than inferred solely from the SIPLUS designation.

Installation and Maintenance

1. Verify the order number: Confirm that the component is 6AG2193-6BP20-4BB1 and that the required configuration is BU20-P12+A0+4B TX RAIL, type B1.
2. Check electronic module compatibility: Ensure that the selected ET 200SP I/O module supports the B1 BaseUnit configuration.
3. Isolate the electrical supply: Follow the site’s lockout procedure and disconnect relevant power sources before installation or maintenance.
4. Review the potential-group layout: Confirm that the BaseUnit is intended to continue the existing load group at its planned station position.
5. Check the AUX requirement: This model has no AUX terminals. Verify that the application does not require an AUX connection at this BaseUnit position.
6. Inspect the mounting rail: Check the DIN rail and neighboring station components for damage, contamination, or mechanical interference.
7. Prepare the conductors: Use conductors and ferrules, where applicable, that meet the push-in terminal requirements for the installed configuration.
8. Verify terminal assignments: Compare each field conductor with the wiring diagram before making connections to the 12 process terminals.
9. Check supply distribution: Confirm the P1 and P2 bus connections and ensure that the supply arrangement remains within the specified current limits.
10. Inspect environmental conditions: Verify mounting orientation, ambient temperature, vibration exposure, and enclosure conditions against the application’s requirements.
11. Check module seating and wiring: Ensure that the BaseUnit and electronic module are correctly installed and that conductors are securely retained.
12. Perform commissioning checks: Restore power according to the approved procedure, verify the station configuration, and test the connected input or output functions.

When troubleshooting, distinguish between a BaseUnit connection issue and a fault in the installed electronic module or field device. Check terminal engagement, supply distribution, wiring continuity, and the configured module before replacing components.

Compatible System Components

The 6AG2193-6BP20-4BB1 belongs to the SIMATIC ET 200SP platform. Components used alongside it must match the B1 BaseUnit arrangement, the intended load-group continuation, and the requirements of the installed electronic module.

Recommended Related Models

Key Advantages

• Provides 12 process terminals for a compatible ET 200SP I/O module.
• Uses push-in connections for straightforward field wiring.
• Continues an existing load group without adding AUX terminals.
• Includes temperature acquisition and conformal coating.
• Supports specified environmental requirements for demanding industrial and railway-related installations.

Technical FAQs

Why is the load-group arrangement important when replacing this BaseUnit?

The 6AG2193-6BP20-4BB1 is configured to continue an existing load group. A replacement with a new-load-group arrangement can change the station’s potential distribution. Confirm the position of the BaseUnit and the power-group layout before selecting an alternative.

What should be considered when the application requires AUX wiring?

This model does not have AUX terminals. If the installation requires an AUX bus connection at the BaseUnit position, select a configuration with the appropriate AUX terminal arrangement instead of assuming the B1 model provides those connections.

How does the integrated temperature acquisition feature affect system selection?

The BaseUnit includes temperature acquisition, so the intended use of this feature should be considered when selecting the surrounding ET 200SP configuration. Confirm that the associated hardware and configuration support the required function rather than treating the BaseUnit as a standalone temperature controller.

Can this SIPLUS BaseUnit be installed in a vertical orientation at the maximum horizontal operating temperature?

No. The specified maximum operating temperature depends on mounting orientation. Horizontal installation supports -40 to +70 °C, with +85 °C for 10 minutes under specified OT4 and ST1/ST2 conditions; vertical installation is specified for -40 to +50 °C. The installation must follow the limits applicable to its actual orientation.