6ES7478-2DA01-0AC0 SIEMENS

6ES7478-2DA01-0AC0 Siemens Basis unit

Brand：SIEMENS Model number：6ES7478-2DA01-0AC0

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The SIEMENS 6ES7478-2DA01-0AC0 is a SIMATIC S7-400 product, specifically a Dummy Module for the S7-400 mounting rack. This module does not perform any active control or processing function; instead, it serves a crucial purpose in the backplane architecture of the S7-400 system.

Product Specifications

Product Type: Dummy Module
Part Number: 6ES7478-2DA01-0AC0
Product Family: SIMATIC S7-400
Compatibility: Designed for use in the S7-400 mounting racks/chassis (e.g., UR1, UR2, ER1, ER2).
Function: It acts as a slot reservation and ensures the correct electrical continuity and bus termination/segmentation of the backplane bus, particularly when a slot is intended for a module that is not yet installed, or when a specific bus configuration is required.
Module Width: It is a standard single-slot width module.
Current Draw: As a passive component, it typically draws very little to no current from the backplane power supply (e.g., $0 \text{ mA}$ or a negligible amount).
Ambient Operating Temperature: $0 \text{°C}$ to $60 \text{°C}$ ( $32 \text{°F}$ to $140 \text{°F}$ ) (Standard for S7-400 components).

Product Advantages

Bus Continuity and Integrity: Its primary advantage is maintaining the integrity of the high-speed backplane bus. It ensures that the electrical signals on the bus are properly terminated or passed through, preventing signal reflections and ensuring reliable communication among the active S7-400 modules.
Future Slot Reservation: It allows users to reserve a physical slot in the rack for a future expansion module (CPU, I/O, or Communication Module) without leaving the slot open, which can disrupt the bus communication in some configurations.
Aesthetics and Protection: It fills an unused slot, providing a neater appearance to the control panel and offering a basic level of protection against dust and foreign objects entering the backplane connector.
Simplified Spares Management: As a passive module, it is a straightforward, low-cost component for maintaining the rack's electrical specifications.

Important Considerations (Precautions)

Not a Functional Module: It is essential to understand that this module does not perform any PLC function (no processing, no I/O connection). It is purely an electrical and physical placeholder.
Bus Segmenting: While it helps with bus integrity, in some complex S7-400 configurations involving multiple racks and communication segments, specific interface modules (IMs) or bus-specific active components are required for proper segmenting, not just the dummy module.
Installation Location: Ensure it is correctly seated and locked into the intended slot on the mounting rack to maintain proper contact with the backplane bus.
Documentation: The presence of the dummy module should be clearly documented in the system drawings to avoid confusion during maintenance or troubleshooting when looking for the active modules.

Product Applications

The 6ES7478-2DA01-0AC0 Dummy Module is used in any industrial control application utilizing the SIEMENS SIMATIC S7-400 system where:

System Planning: A slot is provisioned in the mounting rack for an I/O module or processor that will be installed at a later date, and the slot needs to be filled to maintain bus electrical characteristics.
Spare Slots: The control system design includes spare slots for future expansion, and these slots need a placeholder to ensure the integrity of the active bus segment.
Aesthetic Completion: It is used to provide a uniform and complete appearance to the front of the S7-400 rack in the control cabinet.
Troubleshooting: In rare cases, it can be used to quickly rule out bus integrity issues caused by an empty or faulty slot connector by filling the slot with a known good passive component.

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