6ES7478-2DA01-0AC0 SIEMENS

6ES7478-2DA01-0AC0 SIEMENS Basis unit

Product  Description：

The Siemens 6ES7478-2DA01-0AC0 is a Dummy Module designed for use within the SIMATIC S7-400 Programmable Logic Controller (PLC) system. It is a passive component used to occupy a slot in the S7-400 rack or mounting rail when no active electronic module is required, or specifically when a Central Processing Unit (CPU) slot needs to be filled for mechanical or backplane communication purposes in a multi-processor configuration.

Product Specifications

• Product Type: Dummy Module

• Part Number: 6ES7478-2DA01-0AC0

• Range: SIMATIC S7-400

• Function: Used as a passive space holder, or as a termination component in specific configurations. It is crucial for maintaining the backplane's operational integrity, especially in redundant or multi-processor setups.

• Compatibility: Compatible with the S7-400 series mounting rails and rack systems (e.g., UR1, UR2).

• Power Consumption: None, as it is a passive component.

• Physical Characteristics: Designed to fit a single S7-400 slot, matching the dimensions and connector interface of standard electronic modules for a secure fit.

• Status Note: This is often an older or specialized part, and users should verify its status and replacement options (if any) as product lines evolve.

Product Advantages

• Bus Termination/Integrity: In certain complex S7-400 configurations, especially those involving multiple CPUs (multi-processing) or specific backplane segments, the Dummy Module can act to properly terminate the backplane bus, ensuring reliable and high-speed data transfer between the active modules.

• Mechanical Stability and Appearance: It fills empty slots, which is important for maintaining mechanical stability within the rack and presenting a clean, professional appearance in the control cabinet.

• Future Expansion Placeholder: It can be used to reserve slots for future system expansion without leaving the backplane connectors exposed to the industrial environment.

• Protection: It prevents dust and contaminants from entering the backplane connector pins of unused slots.

Important Considerations (Precautions)

• Multi-Processor Systems: The primary and most critical use of this module is in S7-400 multi-processor configurations where it may be required to occupy the slot for a redundant CPU or a partner CPU when that component is not physically installed, but the backplane addressing requires a module presence. Consult the S7-400 System Manual for exact requirements.

• Installation: Always ensure the dummy module is securely seated in the slot to establish proper mechanical and, if applicable, electrical connection to the backplane.

• Power: Although it consumes no power, always follow safe wiring practices and ensure all other active modules are installed correctly.

• Replacement: If an active electronic module is later installed in a slot occupied by this dummy module, the dummy module must be removed first.

Product Applications

The 6ES7478-2DA01-0AC0 is not an active control component but serves a structural and technical role within the control system hardware architecture.

• S7-400 Redundancy/Multi-Processing: Its most common critical application is in H-system (redundant) or standard multi-processing S7-400 setups, where it may be specifically mandated by the system architecture to ensure correct backplane bus operation or addressing in a CPU slot.

• Cabinet Organization: Used in any standard S7-400 rack to fill empty slots in a neat and organized fashion, which can improve airflow and prevent accidental insertion of objects into the backplane.

• Spare Part Reservation: Acting as a placeholder in a fully wired system to indicate a reserved slot for future S7-400 I/O modules or other components.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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