Siemens 6ES7390-1AF30-0AA0 Mounting Rail

The 6ES7390-1AF30-0AA0 is a special profile mounting rail exclusively for siemens SIMATIC S7-300 series. With an overall length of 530 milímetros, it provides a unified mechanical mounting base, precise positioning and system grounding path for all S7-300 modules (UPC, fuente de alimentación, signal modules, módulos de funciones, communication processors, etc.). It serves as the fundamental structural carrier of S7-300 PLC systems.

Fabricated from high-strength galvanized steel sheet, this rail is fitted with a standard grounding bolt for stable electrical conductivity. Unlike conventional 35 mm DIN rails, its dedicated groove design ensures secure engagement with module latches, preventing bus communication faults caused by poor contact. This model has reached the end of its product lifecycle. Spare units are still available through distributors, and it is widely used for maintenance, expansion and retrofitting of existing S7-300 systems.

Apariencia del producto

2. Desglose del código del modelo

Full Order Number: 6ES7 390-1AF30-0AA0

1. 6ES7: Prefix for product category, referring to Siemens SIMATIC S7 programmable logic controllers and accessories.
2. 390: Sub-category, special profile mounting rails for S7-300 series.
3. 1: Tipo de estructura, standard mounting rail with no extra special functions.
4. AF30: Length code, corresponding to an overall rail length of 530 milímetros.
5. 0AA0: Version code, standard industrial general version without custom features.
6. Parámetros técnicos básicos

3.1 Mecánico & Dimensional Parameters

3.2 Eléctrico & Parámetros ambientales

3.3 Adaptación & Parámetros de montaje

4. Modelos alternativos & Comparación de series completas

Product Lifecycle Notice

An official phase-out announcement (PM400 phase) has been issued for this model. The entire S7-300 series is gradually being discontinued. It is not recommended for new system design. Spare parts or compliant alternative products can be adopted for existing projects.

Full List of S7-300 Special Profile Mounting Rails

Soluciones alternativas

1. Same-brand Upgrade Replacement: There is no direct successor model with the same length. For new systems, migration to the S7-1500 platform with 6ES7590 series rails is recommended. Sin embargo, they are completely incompatible in mounting dimensions and module interfaces and cannot be directly replaced.
2. Compatible Replacement for Existing Projects: Qualified third-party S7-300 dedicated mounting rails can be used. Verify groove dimensions and grounding conductivity before use. Original spare parts are recommended for high-reliability applications.
3. Important Prohibition: Never use ordinary 35 mm DIN rails as a replacement. S7-300 modules adopt dedicated special latches at the bottom. Ordinary rails cannot fix modules reliably, which will cause severe faults including loose modules, poor contact of backplane bus and communication interruption.
4. Supporting Accessories & Expansion Components

6. Escenarios de aplicación & Mounting Restrictions

Aplicaciones típicas

1. Maintenance of Existing Industrial Systems: Spare part replacement, troubleshooting and partial expansion of existing S7-300 PLC systems in automotive, metalurgia, tratamiento de agua, maquinaria de embalaje, material handling and other industries.
2. Small and Medium-sized Standalone Automation: Integration of S7-300 PLC systems for small machine tools, special-purpose equipment and test benches, suitable for control systems with 8 a 10 módulos.
3. Standardized Cabinet Integration: Installation of PLC systems in standard industrial control cabinets, providing unified mounting reference and system grounding to standardize cabinet layout.

Requisitos de montaje & Operating Limits

1. Dirección de montaje: Must be mounted vertically on the cabinet rear panel. Horizontal or inclined installation will impair module heat dissipation and latch reliability.
2. Requisitos de conexión a tierra: Firmly connect the grounding bolt to the cabinet grounding bar with a grounding resistance ≤ 4 Oh. Poor grounding will weaken system anti-interference capability and lead to unstable communication.
3. Splicing Rules: Align spliced rails closely without steps. Install grounding jumpers to avoid interference and surge damage caused by potential difference.
4. Restricciones ambientales: For indoor installation inside control cabinets only. Outdoor exposure is prohibited. Avoid environments with high humidity, salt spray or corrosive gas, which will accelerate rail corrosion.
5. Cutting Rules: Remove burrs after on-site cutting, and apply conductive and anti-corrosion coating on cut surfaces to guarantee continuous grounding.
6. Fallos comunes & Troubleshooting Matrix

The 6ES7390-1AF30-0AA0 is a 530 mm special profile mounting rail dedicated to Siemens S7-300 series. There is no official direct replacement of the same length, as the entire S7-300 series is being phased out. Alternative solutions are classified into three categories according to application scenarios: original similar-length replacement for the same series, compatible replacement for existing maintenance projects, and upgrade & migration solutions for new systems. Ordinary 35 mm DIN rails are strictly forbidden for direct replacement.

1. Directly Compatible Original Siemens Rails of the Same Series

All products below are dedicated special profile rails for S7-300. They feature fully compatible groove specifications, grounding structure and module latches with only different lengths, and can work with all standard S7-300 modules ideally for spare part replacement of existing projects.

> Nota: All above models are at the end of product lifecycle. New units are still available via certain distributors for spare part selection.

2. Compatible Third-party Replacement for Existing Maintenance Projects

For scenarios with insufficient original stock and cost control requirements, qualified domestic special profile rails for S7-300 can be adopted:

1. Compatibilidad: Fully consistent with original products in groove size, mounting height and grounding hole positions, supporting non-destructive direct replacement and reliable latching of all S7-300 modules.
2. Selection Requirements: Select products clearly marked as “S7-300 dedicated mounting rail”. Verify galvanized conductive coating thickness, grounding bolt specification and groove tolerance to avoid loose modules and poor backplane bus contact caused by dimensional errors.
3. Solicitud: Replacement of rusted or deformed rails and additional rails for system expansion of existing facilities.

Strict Prohibition

Do not use ordinary 35 mm DIN rails for replacement. S7-300 modules are equipped with dedicated special latches on the bottom, which cannot be locked firmly by ordinary rails. This will result in serious failures such as module shaking and falling off, backplane bus disconnection and unexpected system shutdown. Ordinary DIN rails are only allowed for temporary commissioning, not for formal long-term engineering application.

3. Actualización oficial & Migration Solution for New System Design

Siemens officially defines the S7-1500 series as the next-generation platform to replace S7-300, with corresponding 6ES7590 series mounting rails. Among them, 6ES7590-1AF30-0AA0 (530 milímetros) is the equivalent model with the same length.

Non-destructive direct replacement is impossible: S7-1500 rails differ completely from S7-300 in groove dimensions, module mounting method and backplane bus protocol. They must be used together with full sets of S7-1500 CPUs, signal modules and power supplies. This is a system-level migration solution rather than a simple single rail replacement.

Solicitud: Design of new automation projects and overall retrofitting of old systems. Not applicable to single rail replacement for existing projects.

Structural Difference: S7-1500 adopts standard 35 mm DIN rails, complying with universal low-voltage component mounting standards and offering higher flexibility for cabinet layout.

4. Guidelines for Alternative Selection
5. Rules for Cut Rails: Remove all burrs from cut surfaces and apply conductive anti-corrosion coating to ensure continuous grounding. Check module spacing after cutting to avoid interference with U-type backplane connectors.
6. Grounding Reliability: Alternative rails must have good conductivity and be firmly connected to cabinet grounding bars with a grounding resistance ≤ 4 Oh. Poor grounding will reduce anti-interference performance and cause analog signal fluctuation.
7. Rules for Spliced Rails: Align spliced rails closely without steps, and install dedicated grounding jumpers (6ES7390-0AA00-0AA0) to ensure equipotential connection.
8. Lifecycle Suggestion: Avoid selecting S7-300 series rails for new project design. Prioritize products of the S7-1500 platform to guarantee long-term spare part supply and technical support.