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- Siemens
- 6AG2193-6BP20-4BF0
- BaseUnit
- Germany
- 20 × 117 × 35 mm
- 0.048 kg
- Xiamen, China
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Product Overview
The Siemens 6AG2193-6BP20-4BF0 is a SIPLUS ET 200SP BaseUnit used to establish the terminal connections between a compatible I/O module and its field circuits. Identified as BU20-P8+A4+0B TX RAIL, type F0, it has eight process terminals and four AUX terminals. The AUX terminals are internally bridged to the left, and the BaseUnit is intended to continue an existing load group within the distributed I/O station.
This configuration is useful in railway control cabinets and industrial installations where the number of field connections, auxiliary wiring requirements, and load-group arrangement must be planned together. For example, an ET 200SP station may use the installed I/O module to acquire sensor signals or switch actuators, while the BaseUnit provides the physical connections for those circuits. The BaseUnit itself does not execute the PLC program or independently process input and output signals.
The four AUX terminals distinguish this model from related BaseUnits without auxiliary connections. Their left-bridged arrangement affects how auxiliary potentials are distributed, so the electrical drawings should be checked before connecting external circuits. The model also continues an existing load group rather than establishing a new one, making its position within the station important during expansion or replacement.
As a SIPLUS RAIL variant, the 6AG2193-6BP20-4BF0 incorporates conformal coating and specified environmental capabilities for demanding operating conditions. Its selection should account for the compatible electronic module, current requirements, potential distribution, mounting orientation, and environmental limits of the actual installation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Product Type | SIPLUS ET 200SP BaseUnit |
| Model | 6AG2193-6BP20-4BF0 |
| Product Family | SIPLUS ET 200SP |
| Product Designation | BU20-P8+A4+0B TX RAIL |
| BaseUnit Type | BU type F0 |
| Standard BaseUnit Reference | 6ES7193-6BP20-0BF0 |
| Terminal Type | Push-in |
| Number of Process Terminals | 8 |
| Number of AUX Terminals | 4 |
| AUX Terminal Arrangement | Internally bridged to the left |
| Load Group Arrangement | Continuation of an existing load group |
| Maximum Current-Carrying Capacity at Up to 60 °C | 10 A |
| Maximum Current for P1 and P2 Power Buses | 10 A |
| Maximum Current for AUX Bus | 10 A |
| Maximum Current per Process Terminal | 5 A |
| Automatic Encoding | Yes |
| Potential Separation Between Backplane Bus and Supply Voltage | Yes |
| Potential Separation Between Process Terminals and Supply Voltage | Yes |
| Conformal Coating | Yes |
| Operating Temperature | -40 to +70 °C; +85 °C for 10 minutes under specified OT4 and ST1/ST2 conditions |
| Railway Application Standards | Includes applicable EN 50121, EN 50124, EN 50125, EN 50155, EN 61373, and EN 45545-2 requirements, subject to specified conditions |
| Dimensions | 20 × 117 × 35 mm |
| Weight | 0.048 kg |
Product Features
- BU type F0 configuration: Provides a defined terminal arrangement for compatible ET 200SP I/O modules.
- Eight process terminals: Connects field circuits to the installed electronic module.
- Four AUX terminals: Supports auxiliary potential distribution through the designated AUX connections.
- Left-bridged AUX arrangement: Simplifies connections that require the specified shared auxiliary potential.
- Existing load-group continuation: Maintains the intended potential-group arrangement when installed in the correct station position.
- Push-in connections: Simplifies conductor installation and routine wiring work.
- Conformal coating: Protects the coated assemblies under the specified environmental conditions.
- Defined current limits: Supports circuit planning based on process-terminal, AUX-bus, and power-bus requirements.
- Railway-oriented environmental capability: Supports applications that meet the specified temperature, vibration, shock, and electromagnetic compatibility requirements.
Working Principle
The 6AG2193-6BP20-4BF0 serves as the physical connection interface for a compatible ET 200SP I/O module. Field conductors terminate at the BaseUnit, while the electronic module handles the actual acquisition or switching of process signals. The BaseUnit provides the required terminal and potential connections without performing the control logic itself.
A typical signal path is:
PLC or Controller → ET 200SP Interface Module → Backplane Bus → I/O Module → BaseUnit Terminals → Field Devices
In a digital input application, a sensor signal enters through the field wiring and reaches the corresponding input module through the BaseUnit connection. In a digital output application, the electronic module switches the assigned circuit and routes the output to the connected actuator. The specific signal function depends on the installed I/O module.
The F0 configuration has eight process terminals and four AUX terminals. The AUX terminals are internally bridged to the left, so their electrical arrangement must be considered before connecting auxiliary circuits. This is especially important when several devices share a common auxiliary potential or when the station is being expanded from an existing configuration.
The BaseUnit is also intended to continue an existing load group. During installation, engineers must check the location of the power-group boundary and confirm that the replacement or additional unit matches the planned station layout. Installing a BaseUnit with a different load-group function can affect the intended power distribution.
Current limits need to be assessed at both the individual terminal and group levels. The specified maximum current is 5 A per process terminal, while the P1 and P2 buses and the AUX bus have their own 10 A limits. The overall circuit design must account for the applicable limits rather than relying on a single current rating.
The conformal coating supports operation in the specified demanding environments, including railway-related installations. It does not eliminate the need for appropriate enclosure protection, correct wiring, or compliance with temperature and vibration limits. Commissioning should include checks of the terminal connections, electronic module compatibility, power distribution, and field-device response.
Role in the SIMATIC ET 200SP Control Architecture
Within an ET 200SP distributed I/O station, the 6AG2193-6BP20-4BF0 provides the terminal interface between the electronic module and the field wiring. Its eight process terminals accommodate the assigned process connections, while the four AUX terminals support the specified auxiliary distribution arrangement.
Controller → ET 200SP Interface Module → Backplane Bus → I/O Module → BaseUnit → Field Circuits
| System Component | Function |
|---|---|
| SIMATIC PLC or Controller | Executes the control program and processes I/O data |
| ET 200SP Interface Module | Connects the distributed station to the controller network |
| 6AG2193-6BP20-4BF0 BaseUnit | Provides eight process terminals and four left-bridged AUX terminals |
| Compatible ET 200SP I/O Module | Acquires input signals or switches output circuits |
| P1 and P2 Power Buses | Distributes the designated supply potentials through the station |
| AUX Bus | Provides the specified auxiliary connection arrangement |
| 24 V DC Power Supply | Supplies the required control or field-circuit voltage where applicable |
| Field Sensors | Supply process measurements or discrete status signals |
| Field Actuators | Respond to commands issued through compatible output modules |
The electronic module determines the signal-processing function. The BaseUnit establishes the terminal connections and auxiliary potential arrangement required by the station. Both must match the application and the intended load-group configuration.
Industrial Applications
| Application | Typical Use |
|---|---|
| Railway Automation | Connecting compatible distributed I/O modules in railway-related control systems |
| Rolling Stock Control Cabinets | Organizing field wiring for sensors, actuators, and auxiliary circuits |
| Transportation Infrastructure | Supporting distributed monitoring and control equipment |
| Industrial Control Panels | Providing terminal connections within modular ET 200SP stations |
| Machine Automation | Connecting compatible digital or analog I/O modules to field circuits |
| Process Monitoring | Routing sensor and status signals through the installed electronic module |
| Auxiliary Circuit Distribution | Connecting suitable auxiliary circuits through the four AUX terminals |
| Equipment Exposed to Vibration | Providing a BaseUnit option for installations that meet the specified environmental requirements |
The suitability of the BaseUnit depends on the connected I/O module, wiring arrangement, electrical loads, and environmental conditions. It is a connection component, not an independent controller or output-switching device.
Installation and Maintenance
- Verify the order number: Confirm that the component is 6AG2193-6BP20-4BF0 and that the required configuration is BU20-P8+A4+0B TX RAIL, type F0.
- Check electronic module compatibility: Ensure that the selected ET 200SP I/O module supports the F0 BaseUnit configuration.
- Isolate the electrical supply: Follow the site’s lockout procedure and disconnect the relevant power sources before installation or maintenance.
- Confirm the load-group position: Verify that the BaseUnit is installed where continuation of the existing load group is required.
- Check the AUX arrangement: Confirm that the four AUX terminals bridged to the left match the intended auxiliary potential and wiring design.
- Inspect the mounting rail: Check the DIN rail and adjacent station components for damage, contamination, or mechanical interference.
- Prepare the conductors: Use compatible conductors and ferrules, where applicable, according to the push-in terminal requirements.
- Verify terminal current limits: Keep each process terminal within its 5 A maximum and observe the 10 A limits for the P1/P2 buses and AUX bus.
- Check the power distribution: Confirm the supply connections and verify that the electrical arrangement matches the station drawings.
- Inspect environmental conditions: Check mounting orientation, operating temperature, vibration exposure, and enclosure conditions against the applicable requirements.
- Verify mechanical seating and wiring: Ensure that the BaseUnit and electronic module are correctly installed and that all conductors are securely retained.
- Perform commissioning checks: Restore power according to the approved procedure, verify the station configuration, and test the connected I/O functions and field-device response.
When troubleshooting, inspect the field wiring, AUX connections, supply distribution, and installed electronic module before replacing the BaseUnit. A fault in the power supply or connected I/O module can produce symptoms that appear to originate from the terminal assembly.
Compatible System Components
The 6AG2193-6BP20-4BF0 is intended for use within the SIMATIC ET 200SP platform. The following component categories may be used in the surrounding station when their electrical, mechanical, and configuration requirements match the installed BaseUnit.
| Component | Function |
|---|---|
| Compatible ET 200SP I/O Modules | Process digital or analog signals through the BaseUnit interface |
| SIMATIC ET 200SP Interface Module | Connects the distributed station to the controller network |
| SIMATIC PLC | Executes control logic and processes I/O data |
| 24 V DC Power Supply | Supplies the required control and field-circuit voltage where applicable |
| ET 200SP Power Distribution Components | Maintain the station’s defined supply and potential-group arrangement |
| DIN Rail | Provides the mechanical mounting structure for the station |
| Compatible Push-In Conductors | Connect field circuits to the BaseUnit terminals |
| Field Sensors | Supply measurement or status signals to compatible input modules |
| Field Actuators | Receive switching commands from compatible output modules |
| Auxiliary Circuit Wiring | Connects suitable circuits through the four AUX terminals |
Recommended Related Models
| Model | Product Type | Relevance |
|---|---|---|
| Siemens 6ES7193-6BP20-0BF0 | SIMATIC ET 200SP BaseUnit | Standard BaseUnit reference for the F0 configuration |
| Siemens 6AG2193-6BP20-4BB1 | SIPLUS ET 200SP BaseUnit | Related type B1 BaseUnit with 12 process terminals and no AUX terminals |
| Siemens 6AG2193-6BP20-4BA0 | SIPLUS ET 200SP BaseUnit | Related type A0 BaseUnit with 16 process terminals and 10 AUX terminals |
| Siemens 6AG2193-6BP20-4DA0 | SIPLUS ET 200SP BaseUnit | Related type A0 BaseUnit with 16 process terminals and AUX connections for a new load group |
| Siemens 6AG2193-6BP20-4DC0 | SIPLUS ET 200SP BaseUnit | Related type C0 BaseUnit with six process terminals and two AUX terminals |
| Siemens 6AG2193-6BP00-4BD0 | SIPLUS ET 200SP BaseUnit | Related type D0 BaseUnit with 12 process terminals and no AUX terminals |
Key Advantages
- Eight process terminals and four AUX terminals in one ET 200SP BaseUnit.
- Push-in connections for straightforward field wiring.
- Left-bridged AUX terminals for the specified auxiliary distribution arrangement.
- Defined current limits for process terminals and potential buses.
- Conformal coating for specified demanding industrial and railway-related environments.
Technical FAQs
What is the difference between the F0 and B1 BaseUnit configurations?
The 6AG2193-6BP20-4BF0 is an F0 BaseUnit with eight process terminals and four AUX terminals bridged to the left. The 6AG2193-6BP20-4BB1 is a B1 BaseUnit with 12 process terminals and no AUX terminals. The correct choice depends on the field connections and potential distribution required by the station.
Can the four AUX terminals be treated as four independent power connections?
No. The AUX terminals are internally bridged to the left, so they share the specified electrical connection arrangement rather than acting as four independent terminals for unrelated potentials. Confirm the intended auxiliary potential and wiring diagram before connecting external circuits.
What current limits must be considered when selecting connected devices?
The specified maximum current is 5 A per process terminal. The P1 and P2 power buses and the AUX bus each have a maximum current-carrying capacity of 10 A. Engineers must check both the individual terminal demand and the aggregate current carried by the relevant bus.
Does the SIPLUS coating remove the need for environmental protection in railway installations?
No. The conformal coating supports the specified environmental requirements, but the installation must still comply with the applicable temperature, vibration, shock, electromagnetic compatibility, and enclosure requirements. Suitability depends on the actual operating conditions and the relevant railway standards.