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- Siemens
- 6ES7133-6CV20-1AM0
- BU Cover
- Germany
- 20 × 73 × 35.3 mm
- 0.059 kg
- Xiamen, China
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Product Overview
The Siemens 6ES7133-6CV20-1AM0 SIMATIC ET 200SP BU Cover is a protective accessory for the BaseUnit positions in a SIMATIC ET 200SP distributed I/O station. It is used to cover an empty BaseUnit when no I/O module, motor starter, or potential distributor is installed in that position.
In modular automation systems, the ET 200SP station is often assembled according to the number and type of signals required by a particular machine or production line. Not every available BaseUnit position needs to be occupied during the initial installation. Some positions may remain unused, while others are intentionally reserved for future expansion.
The 6ES7133-6CV20-1AM0 closes these unused positions with a dedicated cover. Rather than leaving an empty BaseUnit exposed, the cover maintains the intended physical arrangement of the station and protects the vacant mounting position.
This version is intended for 20 mm wide BaseUnits. Its dimensions correspond to the ET 200SP system’s mechanical layout, allowing it to be installed in the appropriate position without occupying the space of an additional I/O module.
Another practical application is maintaining a consistent cabinet layout during phased automation projects. For example, a production line may initially require only eight I/O modules, although the control panel has been prepared with additional BaseUnit positions. The unused positions can be covered with the 6ES7133-6CV20-1AM0 until additional modules are required.
The cover can also accommodate a reference identification label for an I/O module planned for future installation. This helps maintenance personnel identify reserved positions without changing the physical station arrangement.
It is important to distinguish this component from an electronic I/O module. The 6ES7133-6CV20-1AM0 does not process digital or analog signals, communicate with the PLC, or provide additional I/O channels. Its function is strictly mechanical and protective within the ET 200SP assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES7133-6CV20-1AM0 |
| Product Type | BU Cover |
| Product Family | SIMATIC ET 200SP |
| Application | Empty BaseUnit Protection |
| Compatible BaseUnit Width | 20 mm |
| Installation Position | Unoccupied BaseUnit Position |
| Horizontal Installation Temperature | -40 to 60 °C |
| Vertical Installation Temperature | -40 to 50 °C |
| Maximum Installation Altitude | 5,000 m |
| Dimensions | 20 × 73 × 35.3 mm |
| Weight | 0.059 kg |
Product Features
- 20 mm BaseUnit Compatibility: Matches the mechanical width of the corresponding ET 200SP BaseUnit.
- Empty Slot Protection: Covers unused BaseUnit positions in a distributed I/O station.
- Modular Station Arrangement: Allows reserved positions to remain part of the assembled station without installing an I/O module.
- Reference Label Accommodation: Provides space for identification of an I/O module planned for future installation.
- Compact Construction: Fits within the ET 200SP station’s modular mechanical arrangement.
- Wide Operating Temperature Range: Supports horizontal installation from -40 to 60 °C and vertical installation from -40 to 50 °C.
- Accessory-Level Installation: Does not require separate electrical wiring or signal configuration.
Working Principle
Unlike an electronic module, the 6ES7133-6CV20-1AM0 does not have a signal-processing circuit or communication interface. Its operation is based entirely on mechanical installation within the ET 200SP BaseUnit arrangement.
When a distributed I/O station is assembled, each BaseUnit provides a mounting position for the corresponding electronic module. If a particular position is not being used, the BU Cover is installed instead of leaving the position uncovered.
The installation arrangement can be represented as follows:
SIMATIC ET 200SP Station → 20 mm BaseUnit → 6ES7133-6CV20-1AM0 BU Cover → Reserved Module Position
The cover occupies the designated mounting position and closes the otherwise unused area. This maintains the intended physical arrangement of the station and protects the vacant BaseUnit position from direct exposure.
For example, consider a machine control cabinet with several ET 200SP I/O positions. During the initial commissioning stage, only part of the planned I/O configuration may be required. The remaining 20 mm BaseUnit positions can be fitted with the appropriate BU Covers.
When the machine is expanded, the reserved positions can be prepared for the corresponding I/O modules. The reference identification label can help technicians identify the intended module location during subsequent maintenance or modification work.
The component therefore supports modular station organization rather than performing an electrical function. Its correct selection depends primarily on the BaseUnit width and the mechanical configuration of the ET 200SP station.
Role in the SIMATIC ET 200SP Distributed I/O Architecture
The 6ES7133-6CV20-1AM0 is used at the physical assembly level of an ET 200SP distributed I/O station. It occupies an unused BaseUnit position while the remaining electronic modules continue performing their assigned control and signal acquisition tasks.
A typical station arrangement includes the following components:
PROFINET / PROFIBUS Interface Module → ET 200SP Backplane Bus → BaseUnits → I/O Modules / BU Covers
| System Component | Function |
|---|---|
| ET 200SP Interface Module | Connects the distributed I/O station to the higher-level controller |
| BaseUnit | Provides the mechanical mounting and electrical connection for an I/O module |
| 6ES7133-6CV20-1AM0 BU Cover | Covers an unused 20 mm BaseUnit position |
| Digital Input Module | Acquires discrete field signals |
| Digital Output Module | Controls connected actuators and switching devices |
| Analog Input Module | Acquires analog measurement signals |
| Analog Output Module | Supplies analog control signals |
| Server Module | Completes the backplane bus at the end of the station |
| DIN Rail | Provides the mounting support for the ET 200SP assembly |
| Reference Identification Label | Identifies individual modules or reserved installation positions |
The BU Cover does not extend the station’s I/O capacity or replace an electronic module. Its purpose is to maintain the physical configuration of positions that are not currently assigned to an I/O function.
The 20 mm width is particularly important when selecting this accessory. The ET 200SP system also includes a 15 mm BU Cover, 6ES7133-6CV15-1AM0. These versions correspond to different BaseUnit widths and should not be selected interchangeably.
Industrial Applications
| Application | Typical Use |
|---|---|
| Automotive Production Lines | Covering unused ET 200SP BaseUnit positions in machine control cabinets |
| Packaging Machinery | Maintaining reserved I/O positions for future machine options |
| Material Handling Systems | Organizing distributed I/O stations with partially populated configurations |
| Process Automation | Closing unused BaseUnit positions in remote I/O cabinets |
| Assembly Equipment | Preparing additional I/O positions for future production requirements |
| Conveyor Systems | Maintaining a consistent modular station arrangement |
| Water Treatment Plants | Covering unused positions in distributed control panels |
| Food and Beverage Production | Organizing ET 200SP stations during phased equipment installation |
| Machine Tool Systems | Maintaining unused module positions in compact automation assemblies |
| Industrial Control Panels | Protecting vacant BaseUnit positions in modular I/O installations |
Installation and Maintenance
- Verify the BaseUnit Width: Confirm that the vacant position uses a 20 mm wide BaseUnit. The 6ES7133-6CV20-1AM0 is not the correct version for a 15 mm BaseUnit.
- Identify the Installation Position: Locate the unused BaseUnit position within the ET 200SP station and confirm that no electronic module or other accessory is occupying it.
- Check the Station Configuration: Review the physical arrangement of adjacent BaseUnits and modules to ensure that the selected position is intended for a BU Cover.
- Inspect the BaseUnit: Check the mounting area for mechanical damage, dust accumulation, or foreign objects before installing the cover.
- Prepare the Station: Follow the applicable electrical safety procedures for work inside the control cabinet. Observe the station manufacturer’s instructions for installation and handling.
- Check the Cover: Inspect the 6ES7133-6CV20-1AM0 for cracks, deformation, or damage that could interfere with its mounting.
- Position the Cover: Align the BU Cover with the designated 20 mm BaseUnit position, ensuring that its orientation matches the station’s mechanical arrangement.
- Install the Cover: Engage the cover with the corresponding mounting features and secure it according to the ET 200SP installation instructions. Do not force the component into position.
- Check Mechanical Seating: Verify that the cover is correctly positioned and sits evenly without visible gaps or displacement.
- Apply Reference Identification: If the position is reserved for a future I/O module, add the appropriate reference identification label to help technicians recognize its intended assignment.
- Inspect the Completed Station: Check adjacent I/O modules, BaseUnits, and the newly installed cover to ensure that the station’s mechanical arrangement remains correct.
- Record the Reserved Position: Update the cabinet layout or maintenance documentation to identify the covered BaseUnit position and its intended future use.
Compatible System Components
| Component | Function |
|---|---|
| Siemens 6ES7133-6CV20-1AM0 | BU Cover for 20 mm BaseUnits |
| Siemens 6ES7133-6CV15-1AM0 | BU Cover for 15 mm BaseUnits |
| SIMATIC ET 200SP BaseUnit | Provides the mounting position for I/O modules |
| ET 200SP Digital Input Modules | Acquire discrete field signals |
| ET 200SP Digital Output Modules | Control discrete field devices |
| ET 200SP Analog Input Modules | Acquire analog process measurements |
| ET 200SP Analog Output Modules | Supply analog control signals |
| ET 200SP Interface Module | Connects the distributed I/O station to the controller |
| Siemens 6ES7193-6PA00-0AA0 | ET 200SP Server Module |
| Siemens 6ES7193-6LF30-0AW0 | Reference Identification Labels |
Recommended Related Models
| Model | Product Type | Typical Application |
|---|---|---|
| Siemens 6ES7133-6CV15-1AM0 | SIMATIC ET 200SP BU Cover, 15 mm | Covering unused 15 mm BaseUnit positions |
| Siemens 6ES7193-6PA00-0AA0 | SIMATIC ET 200SP Server Module | Completing the station backplane bus |
| Siemens 6ES7193-6SC20-1AM0 | Shield Connector for BaseUnit | Connecting cable shields to the BaseUnit |
| Siemens 6ES7193-6RA00-1AN0 | Strain Relief Unit | Securing cables in ET 200SP installations |
| Siemens 6ES7193-6LF30-0AW0 | Reference Identification Label | Identifying I/O modules and reserved positions |
| Siemens 6ES7193-6LR10-0AA0 | Labeling Strip | Labeling ET 200SP I/O modules |
Key Advantages
- Matches the 20 mm BaseUnit width in the ET 200SP system.
- Covers unoccupied BaseUnit positions.
- Supports modular control cabinet organization.
- Allows unused positions to be reserved for future expansion.
- Accommodates reference identification for planned module positions.
- Requires no separate electrical wiring or signal configuration.
- Maintains the intended mechanical arrangement of the distributed I/O station.
Technical FAQs
What is the difference between Siemens 6ES7133-6CV20-1AM0 and 6ES7133-6CV15-1AM0?
Both are BU Covers for the SIMATIC ET 200SP system, but they correspond to different BaseUnit widths. The 6ES7133-6CV20-1AM0 is intended for 20 mm BaseUnits, while the 6ES7133-6CV15-1AM0 is intended for 15 mm BaseUnits. The correct version must match the physical width of the installed BaseUnit.
Does the 6ES7133-6CV20-1AM0 provide electrical protection or additional I/O functionality?
No. It is a mechanical cover rather than an electronic module. It does not acquire field signals, control outputs, communicate with the PLC, or add I/O channels. Its purpose is to cover an unused BaseUnit position within the ET 200SP station.
Can the BU Cover be used when an ET 200SP station is prepared for future expansion?
Yes. An unused BaseUnit position can be covered while the corresponding I/O module is not yet required. A reference identification label can also be used to indicate which module is planned for that position. When the station is expanded, the cover can be removed and the appropriate module installed following the applicable system procedures.
What operating temperature range applies to the 6ES7133-6CV20-1AM0?
The specified operating temperature range depends on the mounting orientation. For horizontal installation, the range is -40 to 60 °C. For vertical installation, it is -40 to 50 °C. The installation orientation should therefore be considered when evaluating the environmental conditions inside the control cabinet.